Research Article |
Corresponding author: Xin-Fen Gao ( xfgao@cib.ac.cn ) Corresponding author: Bo Xu ( xubo@cib.ac.cn ) Academic editor: Avelinah Julius
© 2023 Wen-Bin Ju, Liu-Yang He, Qi Lan, Ying-Hao Wu, Heng-Ning Deng, Xing-Jin He, Xin-Fen Gao, Bo Xu.
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:
Ju W-B, He L-Y, Lan Q, Wu Y-H, Deng H-N, He X-J, Gao X-F, Xu B (2023) Primula lizipingensis (Primulaceae), a new species from Sichuan, China. PhytoKeys 236: 135-143. https://doi.org/10.3897/phytokeys.236.112169
|
A new species, Primula lizipingensis W.B.Ju, L.Y.He & X.F.Gao, found in Shimian County, Sichuan, China, is described and illustrated. It is morphologically similar to P. rhodochroa and P. socialis, but can be distinguished from them in having shorter plants covering with white farinose, leaf margin sharply dentate above the middle, the leaf blade becomes papery after drying, scapes obsolete, the bract linear-lanceolate to subulate, solitary at the base of the pedicel, and the white hairs present inside the corolla tube.
Aleuritia, Hengduan Mountains, Primula sect, taxonomy
The genus Primula L. is one of the largest genera in the Primulaceae with more than 500 species, and widely distributed in the temperate and alpine regions of the Northern Hemisphere with its major concentration in the Sino-Himalayan regions and in western China, with only a few occurring on mountains in Ethiopia, tropical Asia and South America (
In May 2023, during field expeditions in Liziping National Nature Reserve, an unusual Primula population was discovered. Upon observing its morphological characteristics, such as its mealy, deciduous perennials, and overwintering through an above-ground mealy resting bud, along with bracts that are typically smaller and somewhat swollen or thick, calyx prominently 5-veined, corolla narrow tube and lobes apex deeply emarginate, we have identified this species as belonging to the Primula section Aleuritia. After consulting relevant literature (
The descriptions and illustrations presented here were based on an analysis of the habits and characteristics observed in fresh material during field surveys, as well as the examination of type specimens deposited in CDBI. The morphological features of this new species, as well as those of its similar species, were described using the terminology outlined in the Flora of China (
Primula lizipingensis is morphologically similar to P. rhodochroa and P. socialis. However, the new species can be easily distinguished from P. rhodochroa by its leaf margin sharply dentate above the middle, scape absent, flower solitary subtended by a single, linear-lanceolate to subulate bract, the calyx lobes split to the middle, the corolla tube longer than the calyx, and its interior has white hairs. Compared with P. socialis, the new species is covered with white farinose (vs. glabrous), leaf oblanceolate to spathulate, and papery when dry (vs. obovate-elliptic to oblanceolate, membranous when dry), bracts linear-lanceolate to subulate (vs. linear), calyx lobes split to the middle (vs. split to the middle or below), and corolla tube hairy inside (vs. glabrous).
China. Sichuan: Shimian county, Liziping National Nature Reserve, growing in moist rock crevices covered with moss; 29°00′N, 102°11′E, 4318 m alt., 18 May 2023 (fl.), Liuyang He J-1201 (holotype CDBI!; isotypes KUN!)
Primula lizipingensis sp. nov. A fresh plants B leaves C pin flower (showing flower side and front, the position of anthers and styles in the tube) D thrum flower (showing flower side and front, the position of anthers and styles in the tube) E plants base F calyx, capsule and mature fruit that has already split G bracts. Photographs by W-BJ.
A dwarf farinose tufted perennial herb, at most 2.5 cm tall, with a short stout rhizome and covered at the base by the withered remains of old leaves of the previous year. Leaves forming a dense tuft, papery when dry, including the petiole 5–12 mm long, 2.5–5.5 mm broad, oblanceolate to spathulate, rounded or acute at apex, tapering into the papery winged petiole which when fully developed is as long as the leaf blade, margin sharply dentate above the middle, green above with a thin covering of potentially white farinose glands, thickly covered below with white farina, the midveins and lateral veins are prominent at abaxially. Scape almost obsolete, bearing one flower. Bracts solitary, at base, linear-lanceolate to subulate, more or less white farinose, 1–2.8 mm long. Flower solitary, heterostylous. Pedicels 1.5–5.0 mm long, cover the white farinose, not extended in fruit. Calyx green, campanulate, 5–5.5 mm long, farinose both within and without, prominently 5-veined, split to the middle, lobes narrowly triangular to lanceolate, apex acute. Corolla obscurely annulate, with sparsely white farinose glands abaxially; limb 14–18 mm across, funnelform; tube deep purple, 1.3‒1.8 times the length of the calyx and a few white hairs adaxially; lobes pale purple with a white eye, spreading, 6.5–8.2 × 4.5–6.0 mm, broadly obovate, deeply emarginate. Pin flowers: corolla tube 7–8 mm long, widely ampliated above the insertion of stamens; stamens ca. 1.5 mm above base of corolla tube; style ca. 2/3 as long as tube. Thrum flowers: corolla tube ca. 8 mm long, widely ampliated above insertion of stamens; stamens inserted slightly above the middle of corolla tube; style ca. 2 mm. Capsule oblong, slightly shortly than the calyx.
Flowering occurs in May, fruiting is unknown.
Primula lizipingensis is only known from the type locality Liziping National Nature Reserve, Shimian County, Sichuan, China. It grows in moss-covered limestone crevices at an altitude of 4300–4400 meters.
The specific epithet ‘lizipingensis’ refers to the type locality where the new species occurs, Liziping National Nature Reserve, Sichuan, China.
Data Deficient (DD). Due to insufficient field investigations, we do not yet have a clear understanding of its natural distribution and population status, nor do we have enough information to directly or indirectly assess its risk of extinction. Therefore, we temporarily categorize this species as Data Deficient according to the International Union for Conservation of Nature Red List Categories (
The section Aleuritia was originally considered by
Further research indicates that this new species is similar to P. rhodochroa and P. socialis in that they have dwarf farinose plant, possess short rhizomes, and produce solitary flowers emerging from basal rosettes. P. rhodochroa, distributed in southeast Xizang, thrives in wet moss on boulders or rock faces at altitudes of 4000‒5000 meters. P. socialis, found in western Yunnan, flourishes in shady crevices of mountain rocks at an altitude of 2950 m. P. lizipingensis, found in Shimian County, Sichuan Province, on the eastern edge of the Hengduan Mountains, grows in moss-covered limestone crevices at an altitude of 4300–4400 m. Despite all three growing in limestone dam crevices with moss, prolonged geographical isolation has led to morphological differentiation, resulting in the emergence of distinct species. The same situation also occurs in the morphological and habitat similarities between P. kialensis Franchet and P. yunnanensis subsp. membranifolia (Franchet) Halda. These species are both covered with yellow farinose and showing resemblances in leaf morphology, and inflorescence. The main difference is that P. yunnanensis subsp. membranifolia has a corolla tube length 2–4 times that of the calyx, and its leaves texture is membranous, whereas P. kialensis has a corolla tube length 1–2 times that of the calyx and chartaceous leaves. The former is distributed in counties such as Jiulong, Kangding, and Lixian, located in the eastern part of the Hengduan Mountains, and belongs to a unique species in Sichuan. The latter is distributed in counties such as Dali, Yangbi, and Fengqing, located in the central and western parts of the Hengduan Mountains, and belongs to a unique species in Yunnan. The new species differs from P. rhodochroa in the characteristic of leaf margin teeth, the presence or absence of scape, the characteristic and numbers of bracts, the split degree of calyx lobes, and the presence of hairs inside the corolla tube. Morphologically, the new species is more closely related to P. socialis because both are characterized by having solitary flower and bract, without a scape, but easily recognized by the present of white farina covering the whole plant, leaves smaller and papery after drying with margin sharply dentate, the bract linear-lanceolate to subulate, and hairy with white hairs inside the corolla tube. A detailed comparison of the three species is shown in Table
Comparison of morphological characters among Primula lizipingensis, P. rhodochroa and P. socialis.
Characters | Species | ||
---|---|---|---|
Primula lizipingensis | P. rhodochroa | P. socialis | |
Farinose color | White | white | yellow |
Leaf shape | oblanceolate to spathulate | oblanceolate to narrowly obovate | obovate-elliptic to oblanceolate |
Leaf blade | margin sharply dentate above the middle | margin denticulate to dentate | margin dentate above the middle |
papery when dry | papery when dry | membranous when dry | |
rounded or acute at apex | obtuse to rounded at apex | obtuse to rounded at apex | |
Scape | Absent | present but less than 1 cm | absent |
Inflorescence | flowers solitary | 1−2(4)-flowered umbel | flowers solitary |
Bracts | 1, linear-lanceolate to subulate | 2−3, linear | 1, linear |
Calyx lobes | split to the middle of the calyx | split to 1/3 of the calyx | split to the middle or below of the calyx |
Corolla | tube longer than the calyx, and white hairs adaxially | tube ca. as long as calyx, glabrous adaxially | tube longer than the calyx, glabrous adaxially |
We thank Mr. Zhen-Long Liang for the line drawings of the new species.
The authors have declared that no competing interests exist.
No ethical statement was reported.
This work was supported by the National Plant Specimen Resource Center Project (NPSRC) (E0117G1001), Biological Resources Programme, Chinese Academy of Sciences, BRP CAS, and Wild Plants Sharing and Service Platform of Sichuan Province.
Writing – original draft: WBJ. Investigation: LYH, QL, YHW. Methodology: XJH, BX. Project administration: XFG. Writing – review: BX.
Wen-Bin Ju https://orcid.org/0000-0002-5665-6290
Heng-Ning Deng https://orcid.org/0000-0002-0581-0649
Xing-Jin He https://orcid.org/0000-0003-2064-0112
Xin-Fen Gao https://orcid.org/0000-0002-5703-1639
All of the data that support the findings of this study are available in the main text.