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Research Article
A new species and a new record of Phlomoides (Lamiaceae) from Xizang, China
expand article infoYue Zhao‡, Ya-Ping Chen§, Rui-Zhu Bai§, Colin A. Pendry|, Alexander P. Sukhorukov, Chun-Lei Xiang§
‡ Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
§ Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| Royal Botanic Garden Edinburgh, Edinburgh, United Kingdom
¶ Lomonosov Moscow State University, Moscow, Russia

Corresponding author: Chun-Lei Xiang ( xiangchunlei@mail.kib.ac.cn )

Academic editor: Bo Li
© 2024 Yue Zhao, Ya-Ping Chen, Rui-Zhu Bai, Colin A. Pendry, Alexander P. Sukhorukov, Chun-Lei Xiang.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Zhao Y, Chen Y-P, Bai R-Z, Pendry CA, Sukhorukov AP, Xiang C-L (2024) A new species and a new record of Phlomoides (Lamiaceae) from Xizang, China. PhytoKeys 246: 15-26. https://doi.org/10.3897/phytokeys.246.129057
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Abstract

Phlomoides bomiensis, a new species in Bomi County, Xizang, China, was described and illustrated. In addition, Phlomoides longidentata, previously only known from Nepal and Bhutan, is newly recorded from Dingri County, Xizang, China. The phylogenetic placement of both species within the genus was analysed using nine plastid DNA markers (atpB-rbcL, psbA-trnH, rpl16, rpl32-trnL, rps16, trnK, trnL-trnF, trnS-trnG, trnT-trnL). Both species have brown-black trichomes inside the upper corolla lip and nested within the same subclade of Clade II. A diagnostic key to the Phlomoides species belonging to this subclade is provided.

Key words

Lamioideae, Phlomideae, Phlomis, taxonomy, Tibet

Introduction

As revealed by phylogenetic studies, the resurrected genus Phlomoides Moench includes traditionally defined Phlomis L. sect. Phlomoides (Moench) Briq., Eremostachys Ledeb., Lamiophlomis Kudô, Metastachydium Airy Shaw ex C.Y.Wu & H.W.Li, Notochaete Benth., Pseudomarrubium Popov, Paraeremostachys Adylov, Kamelin & Makhm. and Pseuderemostachys Popov (Scheen et al. 2010; Bendiksby et al. 2011; Mathiesen et al. 2011; Salmaki et al. 2012; Zhao et al. 2023a, b). With this updated circumscription, Phlomoides encompasses approximately 180 species. The genus is characterised by perennial habits, often tuberous roots, cordate to triangular-ovate, entire to bipinnatisect leaves, 5-toothed calyx, dome-shaped and apically hairy upper corolla lips. Notably, some species of Phlomoides have been used in traditional medicine, such as P. rotata (Benth. ex Hook.f.) Mathiesen, P. betonicoides (Diels) Kamelin & Makhm. and P. medicinalis (Diels) Kamelin & Makhm. (Peng and Xiang 2017).

China is one of the three diversity centres of Phlomoides, boasting 60 species and 17 varieties, of which 39 species are distributed in the Tibetan Plateau, Himalaya and Hengduan Mountains (Wu and Li 1977; Li and Hedge 1994; Zhao et al. 2021a, b, 2022, 2023a, 2024a, b, c). However, the diversity of Phlomoides in these areas remains understudied. Recent discoveries have shed light on this hidden species diversity, with the description of four species new to science within these regions. Amongst them, Phlomoides liangwangshanensis Y.Zhao, H.L.Zheng & C.L.Xiang and P. henryi Y.Zhao & C.L.Xiang are distributed in the Hengduan Mountains and P. cuonaensis Y.Zhao, C.L.Xiang & Sukhor. and P. longidentata Pendry are found in the Himalayas (Pendry 2021; Zhao et al. 2021a, 2024a, b).

During our field trip in Xizang, we found one new species of Phlomoides in Bomi County and one new record of the genus in Dingri County. Both species have brown-black trichomes inside the upper corolla lip. In this study, we provide detailed descriptions and illustrations of both the new and newly-recorded species. In addition, we make detailed morphological comparisons with other species which have brown-black trichomes in the upper corolla lip. This comparative analysis aims to facilitate accurate identification and classification within the genus Phlomoides.

Material and methods

Taxon sampling

Taxon sampling is primarily based on our previous molecular phylogenetic study (Zhao et al. 2024a). For this particular study, the putative new species (Phlomoides bomiensis C.L.Xiang & Y.Zhao), the newly-recorded species (Phlomoides longidentata), as well as three morphologically related species [three individuals of Phlomoides tibetica (C.Marquand & Airy Shaw) Kamelin & Makhm., one individual each of Phlomoides rotata (Benth. ex Hook.f.) Mathiesen and Phlomoides nana (C.Y.Wu) Y.Zhao & C.L.Xiang] were sequenced for the first time. In total, our molecular phylogenetic analyses comprised 59 individuals, representing 53 Chinese species of Phlomoides. In addition, three species of Phlomis were selected as outgroup.

DNA extraction, selection of markers and molecular phylogenetic analyses

The CTAB method was used to extract total genomic DNA from silica gel dried leaf materials (Doyle and Doyle 1987). Sequences of nine plastid DNA markers (atpB-rbcL, psbA-trnH, rpl16, rpl32-trnL, rps16, trnK, trnL-trnF, trnS-trnG, trnT-trnL) were chosen for the phylogenetic reconstruction. Primers, polymerase chain reaction (PCR), sequencing and alignment were carried out according to procedures used in Zhao et al. (2024a). The sequences, newly generated in this study together with their GenBank accession numbers, are listed in Suppl. material 1.

Bayesian Inference (BI) and Maximum Likelihood (ML) were used for phylogenetic reconstruction. Detailed settings for BI and ML analyses followed Zhao et al. (2024a). TreeGraph2 (Stöver and Müller 2010) was applied to visualise and edit all trees.

Morphological and taxonomy study

We thoroughly examined herbarium specimens or their digital images from the following Herbaria: B, BM, C, CDBI, E, FI, GH, HIB, IBSC, K, KUN, KYO, L, LE, M, MA, MAO, MO, MW, NAS, P, PE and TI. During our field investigations, we observed and documented important diagnostic characteristics of Phlomoides species. These observations were complemented by high-resolution photographs taken in their natural habitats. Trichome morphology was observed and measured under a Leica DM2500 optical microscope (Leica Microsystems GmbH, Wetzlar, Germany).

Results and discussion

Sequence characterisation

In total, 558 sequences were included for phylogenetic analyses, of which 63 sequences were newly sequenced in this study and they were submitted to GenBank (Suppl. material 1). The aligned cpDNA dataset was 9,222 nucleotides in length (2,382 bp for atpB-rbcL, 439 bp for psbA-trnH, 1,365 bp for rpl16, 677 bp for rpl32-trnL, 968 bp for rps16, 954 bp for trnK, 869 bp for trnL-trnF, 825 bp for trnS-trnG and 743 bp for trnT-L, respectively), of which 883 bp (9.57%) are variable. Characteristics for all datasets are listed in Table 1.

Table 1.
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The statistics of all datasets for phylogenetic analysis.

Datasets No. Taxa Nucleotides (with ambiguous sites excluded) [bp] GC content (%) No. constant sites [bp] No. variable sites [bp] No. parsimony- informative sites [bp]
atpB-rbcL 62 2382 39.3 2244 138 88
psbA-trnH 62 439 32.7 384 55 29
rpl16 62 1365 36.2 1211 154 91
rpl32-trnL 62 677 31.7 576 101 66
rps16 62 968 35.6 891 77 45
trnK 62 954 34 844 110 65
trnL-trnF 62 869 36.1 794 75 42
trnS-trnG 62 825 33.5 738 87 50
trnT-trnL 62 743 29.4 657 86 56
combined 62 9222 35.5 8339 883 532

Phylogenetic reconstruction

The phylogenetic analyses using both Bayesian Inference (BI) and Maximum Likelihood (ML) methods yielded largely congruent tree topologies. Therefore, only the Bayesian 50% majority rule consensus tree is presented, with posterior probabilities (PP) and bootstrap values (BS) indicated near nodes (Fig. 1).

Figure 1. 

Phylogeny of Phlomoides inferred by Bayesian Inference (BI), based on the combined plastid dataset cpDNA. Support values displayed on the branches follow the order BI-PP/ML-BS (“ * ” indicates PP = 1.00 or BS = 100%).

Consistent with our previous molecular phylogenetic analyses (Zhao et al. 2024a), six well-supported clades can be recognised (Fig. 1). Clade II includes the majority of species characterised by having linear-tuberous roots, without persistent basal leaves and glabrous nutlets (Zhao et al. 2024a). In the present study, we found that Clade II can be divided into two major subclades with strong support values. Subclade IIa (Fig. 1: PP = 1.00/BS = 100%) contains the putative new species (P. bomiensis), as well as P. longidentata. Most species in this subclade are characterised by brown-black trichomes inside the upper corolla lip, except for P. rotata and P. henryi (Zhao et al. 2024c). This subclade unites ten species [P. rotata, P. longidentata, P. breviflora (Benth.) Kamelin & Makhm., P. bomiensis, P. tibetica, P. macrophylla (Benth.) Kamelin & Makhm., P. nyalamensis (H.W.Li) Y.Zhao & C.L.Xiang, P. nana, P. milingensis (C.Y.Wu & H.W.Li) Kamelin & Makhm. and P. henryi]. All the species in subclade IIb (Fig. 1: 1.00/98%) have white and transparent trichomes inside the upper corolla lip.

Phlomoides longidentata is sister to P. rotata which is represented by four individuals (Fig. 1: 1.00/93%) and these species are sisters to P. breviflora (Fig. 1: 0.98/76%). P. bomiensis is sister to all three species (Fig. 1: 0.99/62%).

Morphological comparison

The species within subclade IIa are distributed in Tibetan Plateau, Himalaya and Hengduan Mountains. Here, we provide a morphological comparison of the ten species grouped in the subclade IIa (Table 2) to evaluate the most significant diagnostic traits. The trichome colour, floral leaves and calyx teeth were identified as having taxonomic significance within this subclade. A key is provided to differentiate these species.

Table 2.
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Comparative morphological characters amongst Phlomoides bomiensis, P. longidentata and their related species.

Height Basal leaves Floral leaf petiole length Flower colour Trichome colour of upper corolla lip Apical part of calyx tube
P. rotata 2.5–10 cm + Lack obvious petiole Purple or white White Broadly triangular
P. longidentata 50–100 cm – 5–100 mm Light purple to pink Black or brown Emarginate
P. breviflora 60–150 cm – 30–130 mm Purple Black or brown Subtruncate or broadly triangular
P. bomiensis 50–180 cm – 5–70 mm Purple Black or brown Subtruncate or slightly emarginate
P. tibetica 10–30 (50) cm + 0 (5) mm Purple to light purple Black or brown Subtruncate or slightly emarginate
P. macrophylla 100–200 cm – 1–10 (50) mm White to light pink Black or brown Emarginate
P. nyalamensis 100–200 cm – 1–10 (50) mm Purple Black or brown Emarginate
P. nana 30–50 cm + 2–5 (10) mm White to light pink Black or brown Emarginate
P. milingensis 15–50 cm + 2–10 mm Purple Black or brown Subtruncate or slightly emarginate
P. henryi 100–150 cm – 5–35 mm Light purple to pink White Truncate

Taxonomic treatment

Phlomoides bomiensis C.L.Xiang & Y.Zhao, sp. nov.

urn:lsid:ipni.org:names:77347473-1
Fig. 2

Type

China, Xizang (Tibet), Linzhi City, Bomi County, on the road from Bomi to Motuo, near Galongla Tunnel, 29°48′22.4″N, 95°42′2.45″E, alt. 3454 m, 22 Aug 2023, Y. Zhao, R.Z. Bai, Q. Tian & M.L. Qian XCL2584 (holotype: KUN 1614346!; isotypes: KUN 1614347!, KUN 1614348!, KUN 1614349!).

Diagnosis

Phlomoides bomiensis is morphologically most similar to P. nyalamensis and P. breviflora. These species are often taller than 1 m and have a purple corolla with brown to black trichomes inside the upper lip. It differs from P. nyalamensis by its subtruncate to slightly emarginate calyx teeth, posterior filaments with reflexed appendages at base and floral leaves with obvious petioles (vs. obviously emarginate calyx teeth, posterior filaments without appendages and sessile upper floral leaves). It differs from P. breviflora by its corolla that is longer than 2 cm and its oblong nutlets (vs. corolla often shorter than 1.5 cm and inflated globose nutlets). The differences between the ten species from subclade IIa are listed in Table 2.

Description

Perennial herbs. Roots robust, linear-tuberous. Stems 0.5–1.8 m tall, subquadrangular, robust, lower stem part glabrous, upper part with simple trichomes. Basal leaves absent; stem leaves with petioles 5–14 cm long, with simple trichomes, blade cordate, papery, 8–21 × 8–18 cm, adaxially green with simple trichomes, denser on vein, abaxially light green, only with sparse simple trichomes on vein, margin crenate, apex acute. Verticillasters axillary, 8–18-flowered; floral leaves with petioles 0.5–7 cm long, blade cordate to truncate, 3–15 × 2–12 cm, gradually reduced upwards; bracts linear to lanceolate, 8–10 mm long, with sparse long (2–3 mm) simple trichomes. Calyx tubular, 12 × 5 mm, conspicuously 10-veined with sparse simple (2–3 mm long) trichomes on veins, tube subtruncate to slightly emarginate, teeth 5, ca. 1 mm long, apical spines 1 mm long. Corolla purple, 21–23 mm long, 2-lipped; posterior lip ca. 8–10 mm long, galeate, densely stellate tomentose outside, margin denticulate, brown to black bearded inside; anterior lip 3-lobed, ca. 7 × 8 mm, middle lobe largest, oblong, ca. 5 × 3 mm, lateral lobes ovate; tube glabrous outside, ca. 11 mm, annulate pilose inside. Stamens 4, included within posterior lip, with “cobweb-like” indumentum, posterior filaments with reflexed appendages at base. Style unequally 2-lobed. Nutlets oblong, apex truncate, glabrous.

Figure 2. 

Phlomoides bomiensis C.L.Xiang & Y.Zhao A habitat B, C verticillaster with floral leaves D plant E verticillaster F flower G bracts H dissected flower I appendages at base of posterior filaments (arrow) J calyx and dissected calyx K floral leaves L Stem leaves (Photographed by Yue Zhao).

Phenology

Flowering from August to September, fruiting from October to November.

Distribution and habitat

Based on our field collections and previously collected specimens, P. bomiensis is known to occur in Bomi County and Motuo County, Xizang (Tibet), China. It grows in forests and forest margins at altitudes between 3400 and 4200 m (Fig. 3).

Figure 3. 

Distribution of Phlomoides bomiensis (black triangle), new location of P. longidentata (black star) and known localities of P. longidentata (black circle).

Etymology

The specific epithet refers to the name of the Bomi County in Xizang Autonomous Region, where the new species was discovered.

Chinese name (assigned here)

bō mì cǎo cāo sū (波密草糙苏)

Additional specimen examined (paratypes)

China. Xizang (Tibet): • Linzhi City, Motuo County, Northern Galongla Pass, alt. 3500–3700 m, 20 Aug 1982, S.Z. Cheng & B.S. Li 000315 (PE 00923558!, PE 00832483!, PE 00832484!) • Linzhi City, Bomi County, 30 km away from Zhamo Road, alt. 4200 m, 27 Jul 2010, South Tibet Expedition Team STET1237 (PE 02328210!) • Linzhi City, Bomi County, Galongla Mountain, alt. 3879 m, 17 Jul 2022, J.F. Xiao, H.Z. Feng & Er.F. Huang XJF114 (KUN 1614350!).

Phlomoides bomiensis was first collected more than 40 years ago (S.Z. Cheng & B.S. Li 00315; PE 00923558!, PE 00832483!, PE 00832484!), but the specimens were then identified as Phlomoides umbrosa (Turcz.) Kamelin & Makhm. var. australis (Hemsl.) C.L.Xiang & H.Peng. However, Phlomoides umbrosa var. australis was distinguished from P. bomiensis by having white or transparent trichomes on upper corolla and subsessile floral leaves (vs. brown-black trichomes on upper corolla and floral leaves with petioles 0.5–7 cm long). Another specimen of P. bomiensis was collected in 2010 (South Tibet Expedition STET1237; PE 02328210!), but it was misidentified as Phlomoides tibetica. The differences between Phlomoides tibetica and P. bomiensis are provided in Table 2.

Phlomoides longidentata Pendry, Edinburgh J. Bot. 78: 4, 2021.

Fig. 4

Type

Nepal, Solukhumbu District, Namche Bazar, above bridge over Dudh Kosi. 27°47′31′′N, 86°42′57′′E, alt. 3060 m, 12 Sep 2006, DNEP3 BX36 (holotype: E!; isotypes: KATH!, TI!, TUCH!).

Diagnosis

Phlomoides longidentata is a recently described species from Bhutan and Nepal (Pendry 2021). Specimens of P. longidentata were collected by Chinese collectors as early as 1959 (Anonymous 752; PE 00832482!), when it was identified as P. umbrosa and P. umbrosa var. australis. During our field investigations in Rongxia Town, we rediscovered this species in the wild. It rather looks like a perennial herb, but not annual as described by Pendry (2021). Here we provide description of this species.

Description

Perennial herbs. Roots delicate, thin, linear-tuberous. Stems 30–60 cm tall, subquadrangular, unbranched, stellate pilose. Basal leaves absent; stem leaves with petioles 4–19 cm long, with stellate (with a long central ray) and simple trichomes, blade cordate, papery, 4–14 × 4–15 cm, adaxially green with sparse simple trichomes, denser and longer on the main vein, abaxially light green, with dense stellate trichomes with equal rays, (stellate trichomes denser and with longer central ray on the veins), base cordate, margin serrate or crenate, apex acute. Verticillasters axillary, 8–20-flowered; floral leaves with petioles 0.5–10 cm long, blade lanceolate, base cordate to truncate, 4.5–13 × 2–11 cm, gradually reduced upwards; bracts subulate, 7–8 mm long, with sparse long simple trichomes, ca. 2 mm long. Calyx tubular, 10–11 × 4–5 mm, pubescent outside with sparse stellate trichomes with equal rays outside (10 tubular veins have longer central rays); tube apically emarginate; teeth 5, unequal, two longer teeth 4 mm long, three shorter teeth 2–3 mm long. Corolla light purple to pink, 19–22 mm long, 2-lipped; posterior lip 7–8 mm long, galeate, densely stellate tomentose outside, margin denticulate, brown to black-bearded inside; anterior lip 3-lobed, ca. 6 × 8 mm, middle lobe largest, oblong, ca. 5 × 3 mm, lateral lobes ovate; tube glabrous outside, ca. 12 mm, annulate pilose inside. Stamens 4, included within posterior lip, with “cobweb-like” indumentum, posterior filaments with reflexed appendages at base. Style unequally 2-lobed. Nutlets oblong, apex truncate, glabrous.

Figure 4. 

Phlomoides longidentata Pendry A habitat B, D plant C, E verticillaster F bracts G flower H dissected calyces I dissected flower J appendages at base of posterior filaments (arrow) K floral leaves L stem leaves (Photographed by Yue Zhao).

Phenology

Flowering from July to September, fruiting from October to December.

Distribution and habitat

China, Bhutan and Nepal; new record for China found in Xizang (see below). It grows in forests and forest margins at altitudes between 2000 and 3800 m (Fig. 3).

Chinese name (assigned here)

cháng cì cǎo cāo sū (长刺草糙苏)

Additional specimens examined

China. Xizang Province: • Rikaze City, Dingri County, Rongxia Town, 28°1′12.7″N, 86°15′52.1″E, alt. 2888 m, 29 Aug 2023, Y. Zhao, R.Z. Bai, Q. Tian & M.L. Qian XCL2670 (KUN 1614352!, KUN 1614353!) • Rikaze City, Dingri County, Rongxia Town, 28°1′12.7″N, 86°15′52.1″E, alt. 2888 m, 11 Sep 2019, Y.P. Chen, Y. Zhao & B.Y. Zhang EM1123 (KUN 1614351!) • Rikaze City, Dingri County, Rongxia Town, alt. 3200 m, 2 Aug 1959, Anonymous 752 (PE 00832482!).

Key to species of Phlomoides from subclade IIa

1 Upper corolla lip with trichomes transparent to white 2
– Upper corolla lip with trichomes brown to black 3
2 Stellate trichomes absent on leaves and bracts, plant often taller than 1 m P. henryi
– Stellate trichomes present on leaves and bracts, plant often shorter than 10 cm P. rotata
3 Bracts and calyces with brown to black trichomes 4
– Bracts and calyces with white trichomes 5
4 Bracts with black simple trichomes, stellate trichomes absent P. tibetica
– Bracts with brown simple and stellate trichomes P. milingensis
5 Calyx teeth obviously emarginate 6
– Calyx teeth subtruncate or slightly emarginate 9
6 Calyx with two longer and three shorter apical teeth P. longidentata
– Calyx with five equal teeth 7
7 Plant less than 0.5 m tall, basal leaves present; upper floral leaves with petiole ca. 2–5 mm long P. nana
– Plant often taller than 1 m, basal leaves absent; upper floral leaves lack petiole 8
8 Corolla purple P. nyalamensis
– Corolla white P. macrophylla
9 Corolla less than l.5 cm long P. breviflora
– Corolla more than 2 cm long P. bomiensis

Acknowledgements

We would like to thank the staff of the following Herbaria for their kind help at the research facilities: B, BM, C, CDBI, E, FI, GH, HIB, IBSC, K, KUN, KYO, L, LE, M, MA, MAO, MO, MW, NAS, P, PE, S, SG, TI, W, WUK and XJBI. The study was designed by A.P.S. in accordance with scientific programme 12-2-21 of the Department of Higher Plants (Lomonosov Moscow State University).

Additional information

Conflict of interest

The authors have declared that no competing interests exist.

Ethical statement

No ethical statement was reported.

Funding

This work was supported by the National Natural Science Foundation of China (grant No. 32161143015), the International Partnership Program of Chinese Academy of Sciences (grant No. 070GJHZ202211FN), and the “Ten Thousand Talents Program of Yunnan” (Top-notch Young Talents Project, No. YNWR-QNBJ-2018-279).

Author contributions

YZ and CLX conceived this research. YZ, YPC, RZB collected materials. YZ performed the experiments. YPC and XCL analyzed the data. All the authors wrote the manuscript. All authors read and approved the final version of manuscript.

Author ORCIDs

Yue Zhao https://orcid.org/0000-0001-6850-5070

Ya-Ping Chen https://orcid.org/0000-0002-7502-1848

Alexander P. Sukhorukov https://orcid.org/0000-0003-2220-826X

Chun-Lei Xiang https://orcid.org/0000-0001-8775-6967

Data availability

All of the data that support the findings of this study are available in the main text or Supplementary Information.

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Supplementary material

Supplementary material 1 

List of Phlomoides taxa sampled with information related to taxonomy, voucher information, and GenBank accession numbers

Yue Zhao, Ya-Ping Chen, Rui-Zhu Bai, Colin A. Pendry, Alexander P. Sukhorukov, Chun-Lei Xiang

Data type: xlsx

Explanation note: GenBank accession numbers of the newly generated sequences are marked in bold, other sequences are taken from GenBank (– indicates missing information).

This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0/). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this Dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited.
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