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Research Article
Onosma anatolica, a new species of Boraginaceae from Turkey
expand article infoRıza Binzet
‡ Mersin Üniversity, Mersin, Turkey
Open Access

Abstract

Onosma anatolica Binzet, is described and illustrated as a new species from Niğde province in southern Anatolia, Turkey. It belongs to sect. Onosma L. subsect. Asterotricha (Boiss.) Gürke. The new species is closely related to Onosma subulifolia Riedl from which it is distinguished. O. anatolica is readily distinguished from O. subulifolia by its sterile shoots, the green-grey stem indumentum, longer bracts, yellow and puberulous petals. The IUCN threat category of O. anatolica is determined as “CR (Critically Endangered)”. A distribution map and anidentification key for O. anatolica and O. subulifolia supplement the study.

Keywords

Boraginaceae, Onosma, Endemic, Niğde, Turkey

Introduction

The family Boraginaceae s.s. comprise some 1600 species (Chacon et al. 2016, Luebert et al. 2016 Mehrabian et al. 2012, Kolarčik 2010; Cecchi and Selvi 2009). Members of the family are widespread in western and central Asia and in the Mediterranean area (Jávorka 1906, Meusel et al. 1978). The family comprises about 44 genera and 375 species in Turkey (Güner 2012).

The genus Onosma L. (Boraginaceae-Lithospermeae) is one of the largest in the Boraginaceae and includes about 230 species, mainly distributed in the Mediterranean region, southwest Asia, and temperate Europe (Boissier 1879, Riedl 1967, Peruzzi and Passalacqua 2008, Binzet et al. 2010, Mehrabian et al. 2011, 2014, Ranjbar and Almasi 2014). In Turkey, the genus is represented by about 103 species as the rate of species endemism amount to 50% (Riedl 1978, Davis et al. 1988, Yıldırımlı 2000, Riedl et al. 2005, Binzet and Orcan 2007, Kandemir and Türkmen 2010, Aytaç and Türkmen 2011, Koyuncu et al. 2013, Guner 2012, Binzet 2016). This genus is perennial, usually suffrutescent or consists of biennial herbs (Stevanovic et al. 2003, Akçin and Binzet 2011). Onosma is systematically difficult, and most of the diagnostic characters are based mainly on the whole indumentums, leaf and flower morphology (Ball 1972, Riedl 1978, Peruzzi and Passalacqua 2008, Pavlova 2009). To identify the sectional categories of the Onosma members, the indumentum of the stem and the leaves are of significance (Özcan 2009). The genus has been divided into three groups, originally described as sections, but here recognized only as informal groups: Asterotricha, with basal leaves covered by stellate trichomes or asterosetae (i.e. along tubercled seta with several shorter rays at its base), Haplotricha, with basal leaves covered by simple setae, and Heterotricha, with both simple setae and asterosetae on the basal leaves (Boissier 1879, Peruzzi et al. 2004, Peruzzi and Passalacqua 2008, Koyuncu et al. 2013).

During a field trip in June 2011, some interesting Onosma specimens were collected from the Niğde province in Southern Anatolia. The few plants gathered in 2011 were complemented by collection conducted in June 2015 from the same site. Detailed morphological studies indicated that the population of Onosma from the Niğde province represent a hitherto unknown species related to O. subulifolia. This species is described here as new to science bringing the total number of the species known from Turkey to 104.

Material and methods

Specimens of Onosma anatolica were collected by the author during three field excursions in Niğde province in June 2011 and June 2015. Totally 8 herbarium specimens were collected from one locality and deposited in ANK, GAZI and the Herbarium of Mersin University. I have compared the new Onosma anatolica specimens with O. subulifolia based on relevant taxonomic literature (Riedl 1978). The holotype photo of O. subulifola was taken from E. Preliminary conservation assessments were made using the IUCN (2012) guidelines. For the palynological definision in total 50 pollen grains and 20 mature nutlets were measured using a light microscope (LM) and stereo-binocular microscope. In addition, observations were made using a scanning electron microscope (SEM).

For pollen studies using LM, grains were taken from fresh and herbarium materials prepared according to the Wodehouse methods (Wodehouse 1935). The polar axis (P), equatorial axis (E), and other characteristics (plg, plt, clg, clt, exine, intine and t; see Table 1 for abbreviations) of the pollen grains were measured using an Olympus BX40 with a 100× objective until a Gaussian curve was acquired (Table 1). For SEM observations, pollen grains obtained from each specimen were transferred onto stubs and coated with platinum. The SEM micrographs were taken with a ZEISS supra 55. In this study, nomenclature for pollen morphology was used in accordance with Wodehouse (1935), Faegri and Iversen (1989) and Punt et al. (1994).

Pollen morphological parameters of O. anatolica (W: Wodehouse Method).

Taxa Pollen shape P/E P [µm] E [µm] plg [µm] plt [µm] clg [µm] clt [µm] Ex [µm] i [µm] t [µm]
O. anatolica prolate 1.35 17.31 12.76 2.90 3.02 12.76 2.95 0.70 0.50 5.93

Morphological characters of Onosma subulifera used in this paper for comparation were obtained from relevant taxonomic literature (Riedl 1978).

Results

Onosma anatolica (Sect. Onosma subsect. Asterotricha) Binzet, sp. nov.

Figures 1, 2

Type

Turkey, C5 Niğde: Çamardı, 2 km South of Demirkazık village, subalpine community with dwarf shrub and thorn-cushion, 1760 m, limestone, 22 June 2015, 37°50'47"N, 35°05'32"E, Binzet 201501 (holotype: ANK; isotype: GAZI).

Diagnosis

Onosma anatolica is related to O. subulifolia especially by its habit, calyx and corolla length. However, the new species differs mainly in its sterile shoots; a green-grey stem with adpressed setose trichomes, the setae arising from short stellate hairy and shortly hairy (not bluish-black, otherwise glabrous as in O. subulifolia); sterile rosette leaves and basal leaves -50 × 1–1,5(-1.8) mm, revolute-subulate; cauline leaves -20 × 1–1.5(-1.8) mm, (as opposed to 15–32 × 1.5(-1.8) mm in O. subulifolia); an inflorescence of 1–2 cymes, sometimes elongated after flowering (not short subcapitate); flower bracts 8–15 × 1–2 mm, the apex acute (as opposed to 7–8 mm, apex lingulate in O. subulifolia); pedicel 1–2 mm (not 1–1.5 mm); calyx 6–8 mm in flower, 8–12 mm in fruit, suboblate in shape, patent strigose on ±tubercles and shortly hairy on the outside and rarely hairy on the inside (as opposed to 10–11 mm, subobtuse, and hispid in O. subulifolia); corolla yellow, clavate, puberulous, lobes 1 mm long, 1.7 mm wide at base, widely triangular (as opposed to white, clavate-campanulate, glabrous, lobes short, acute in O. subulifolia); and nutlets 3–3.5 × 2–2.3 mm, short beaked, grey.

Figure 1.

In situ photographs of O. anatolica (a habit b flowers).

Figure 2.

The holotype of Onosma anatolica from the herbarium ANK: Binzet 201501, 22 June 2015. (Photo Rıza Binzet).

Description

Perennial rhizomatous herb, rhizome divided into several, ca. 8 mm diameter, subterranean, creeping branches. Aerial stems up to 12 cm tall(including inflorescence), ca. 1(-1.5) mm in diameter, green to grey, covered by adpressed setose, setae arising from short stellate trichomes, shortly hairy, sterile rosette to 5 cm. Leaves crowded at base, leaves of the sterile rosette and basal leaves -50×1–1.5 (-1.8) mm, acute, revolute-subulate, adpressed setose, setae arising from stellate trichomes (asterotrichous state). Cauline leaves -20×1–1.5(-1.8) mm, acute, indistinct revolute-subulate, upper surface covered by densely adpressed setae arising from stellate hairy and sparsely adpressed setose, setae arising from stellate hairy on lower surfaces. Upper cauline leaves resembling lower ones, but smaller in size. Inflorescence of 1–2 cymes, forming a short subcapitate cluster, sometimes elongating after flowering. Flower bracts 8–15 × 1–2 mm, linear-subulate, abruptly narrowed and tapering towards an acute apex, ± patent setose with stellate trichomes and tubercles. Pedicels 1–2 mm. Calyx 6–8 mm in flower, 8–12 mm in fruit, free to base, lobes narrowly linear, suboblate densely covered with patent strigose on ± tubercles and shortly hairy on the outside and rarely hairy on the inside. Corolla yellow, 15–18 mm, clavate, puberulous, reflexed lobes 5, 1 mm long, 1.7 mm wide at base, widely triangular, acute, annulus glabrous. Anthers included, linear, ca. 6 mm, sagittate, connate at base, included or sterile tips exerted. Filaments ca. 5 mm. Style 3–5 mm protruding outside the corolla limb, stigma small, distinctly bilobed. Nutlets 3–3.5×2–2.3 mm, shortly beaked, grey. Pollen grains heteropolar, shape prolate P/E(Polar axis/Equatorial axis) ratio 1.35.

Etymology

The species epithet anatolica refers to Anatolia, the Asian part of Turkey.

Distribution and ecology

Onosma anatolica is distributed in southern Anatolia (Niğde) and grows in subalpine dwarf shrub and thorn-cushion communities. The geological substrat is limestone and the new species occurs only between 1700 and 1800 m. The species belongs to the Irano-Turanian floristic region. Species growing in close proximity to the vew species are: Astragalus angustifolius Lam. subsp. angustifolius, Euphorbia kotcchyana Fenzl. Bromus cappadocicus Boiss. et Bal. Marrubium heterodon (Benth.) Boiss. & Balansa, Poa bulbosa L., Bromus tectorum L., Centaurea pseudoreflexa Hayek, Centaurea chrysantha Wagenitz, Astragalus sp. Sideritis libanotica Labill. subsp. Linearis (Bentham). Bornm., Anthemis sp., Galium incanum SM., Convolvulus compactus Boiss., and Alyssum aureum (Fenzl.) Boiss. Phytosociologically the community where the new species occurs can be grouped into Astragalo-Brometea Quézel 1973 class and Astragalo-Brometalia Quézel 1973 order (Quézel 1973, Eren et al. 2004, Parolly 2004).

Conservation status

Onosma anatolica is hitherto known only from the type locality, and its estimated area of occupancy is less than 50 km2. Moreover, the area is subjected to heavy grazing pressure. Because of its localized distribution, small population size and grazing pressure, it should be considered as ‘Critically Endangered (CR)” according to the IUCN criteria A3 and B2 (IUCN 2012).

Additional specimens (paratype)

Type locality, 10 June 2011, Binzet 201122 (Mersin University).

Additional specimens examined

Onosma subulifolia: Turkey A5 Sinop: after Kargı, 250 m, Tobey 2625, 11 May 1969 (holotype, E 00022534, photo).

Phenology

Flowering from May to June, setting fruit until late July.

Palynology

Pollen grains are heteropolar, trisyncolporate and subprolate. Exine surface of the grains is insular. The insulae have free scabrae and the scabrae are widely spaced. The average means of the number of scabrae in each insulae range from 6 to 15. The main palynological characters and SEM micrographs of O. anatolica are presented in Table 1 and Figure 5.

Nutlet morphology

Nutlet size shows some variations, Nutlets 3–3.5×2–2.3 mm, shortly beaked, and grey. Nutlet surface ornamentation is rugose and characterized by the epidermal cells of the nutlet surface having small or fine wrinkles (Fig. 6).

Figure 3.

The holotype of Onosma subulifolia: Tobey 2615, 11 May 1969 (E 00022534); image available at website: Source: http://elmer.rbge.org.uk/bgbase/vherb/bgbasevherb.php

Figure 4.

Distribution map of O. anatolica Binzet (filled triangle) and O. subulifolia (filled circle).

Figure 5.

SEM microphotograph of pollen of O. anatolica.

Figure 6.

SEM microphotograph of nutlet of O. anatolica.

An updated key to the several flowering stems and sterile rosettes, leaves 1–1.5(-1.8) mm broad species of Onosma (Asterotrichous group) in Turkey is proposed below

1 Bracts 7–8 mm, calyx 10–11 mm, corolla white, clavate-campanulate, glabrous. O. subulifolia
Bracts 8–15 mm, calyx 6–12 mm, corolla yellow, clavate, puberulous O. anatolica

Discussion

Onosma anatolica belongs to Onosma sect. Asterotricha subsect. and it is distributed in Southern Anatolia (Niğde) and grows on the steppe and rocky pastures. It is an element belong to the Irano-Turanian floristic region. It shows some affinity to O. subulifolia which is placed in the same subsection and can be easily distinguished from that species by its sterile shoots; green-grey stem with adpressed setose trichomes, the setae arising from stellate hairy and shortly hairy, sterile rosette leaves and basal leaves -50 × 1–1.5(-1.8) mm; revolute-subulate, cauline leaves -20 × 1–1.5(-1.8) mm; bracts 8–15 × 1–2 mm; calyx 6–8 mm in flower, 8–12 mm in fruit, suboblate, patent strigose on ±tubercles and shortly hairy on the outside, rarely hairy on the inside; yellow corolla, clavate, puberulous, nutlets 3–3.5 × 2–2.3 mm in size, short beaked, grey. Details of the differences between O. anatolica and O. subulifolia are presented in Table 2.

The morphological differences between Onosma anatolica and O. subulifolia.

O. subulifolia O. anatolica
Stem Bluish-black, adpressed setose, otherwise glabrous. Green-grey, woody at base, adpressed setose with stellate hairy and shortly hairy.
Leaves 15–32 × 1–1.5(-1.8) mm, involute-subulate, densely adpressed setose. Sterile rosette and basal leaves -50 × 1–1.5(-1.8) mm, revulate-subulate, adpressed setose with stellate hairy. Cauline leaves -20 × 1–1.5(-1.8) mm, indistinct revulate-subulate, densely covered, adpressed setose with stellate hairs on upper surfaces and sparsely adpressed setose with stellate hairs on lower surfaces.
Inflorescence Short subcapitate Cymes 1–2, short subcapitate, sometimes elongated after flowering.
Bracts 7–8 mm, flat, apex lingulate. 8–15 × 1–2 mm, linear-subulate, abruptly narrowed and tapering towards an acute apex, ±patent setose, stellate and tuberculate.
Pedicel -1–1.5 mm 1–2 mm
Calyx 10–11 mm, lobes narrowly linear, subobtuse, hispid. 6–8 mm in flower, 8–12 mm in fruit, lobes narrowly linear suboblate, patent strigose on ± tubercles and shortly hairy on outside and rarely hairy on inside.
Corolla White, clavate-campanulate, glabrous, lobes short, acute. Yellow, clavate, puberolous, lobes 1 mm long, 1.7 mm wide at base, widely triangular.
Nutlets Unknown 3–3.5 × 2–2.3 mm, shortly beaked, grey.

Acknowledgements

I would like to thank the SEM laboratory of Mersin University (MEİTAM) for helping me with the SEM studies.

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