Research Article |
Corresponding author: Hasan Yıldırım ( hasanyldrm@gmail.com ) Academic editor: Sandy Knapp
© 2016 Levent Şık, Hasan Yıldırım, Ademi Fahri Pirhan, Yusuf Altıoğlu, Meliha Gemici.
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:
Şık L, Yıldırım H, Pirhan AF, Altıoğlu Y, Gemici M (2016) Galium shinasii (Rubiaceae): a new species of Galium L. from Eastern Turkey. PhytoKeys 75: 19-29. https://doi.org/10.3897/phytokeys.75.10244
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Galium shinasii Yıldırım (Rubiaceae), is described as a new species from Malatya Province in eastern Anatolia, Turkey. The new species is morphologically related to Galium cornigerum Boiss. & Hausskn. G. lasiocarpum and G. sorgereae Ehrend. and Schönb. but clearly differs from them based on the morphological differences presented in the species description. In addition, the conservation status, the distribution map, and notes on the biogeography and ecology of the new species are given.
Rubiaceae , Galium , ecology, taxonomy, Turkey
The family Rubiaceae is the fourth-biggest angiosperm family with about 660 genera and 11.500 species (
A total of 121 Galium taxa (104 species) are found in Turkey and 60 taxa (endemism rate of 50%) are endemic to this country (
Malatya is located in the eastern part of Turkey, one of the richest centres of species endemism in Turkey (
Levent Canyon is one of the famous areas among biologists because of the high endemism in Malatya province. Recntly, several new plant species were described in this area. Levent Canyon is characterized by marlstone, a soft, finely fissured sedimentary rock (
In June 2011, the second author collected an unusual and distinct specimen of Galium on marlstone-calcareous rocky cliffs in the Levent Canyon which authors believe to be of a new species for science.
Specimens of the putative new species were compared with herbarium specimens at
Turkey: B7 Malatya: Akçadağ district, Levent Canyon, on marlstone rocky cliffs 1390 m, 26.06.2011, H.Yıldırım 2128 (holotype: EGE42431!, isotypes: EGE42432!,
Turkey: Malatya: Akçadağ district, Levent Canyon, on marlstone rocky cliffs 1390 m, 29.06.2015, H.Yıldırım 3358 (
Galium shinasii is related to Galium cornigerum, G. lasiocarpum and G. sorgereae but it differs from them in having very reduced flowers (not flowers relatively larger), 1.2–1.8 mm corolla diam (not 2–5 mm); yellowish-green to reddish-green and 0,5–1 mm long tepals (not white or pink and not at least 2 mm); dorsal and ventral surface of with densely transparent tubercles and lateral surface 0.2–0.4 mm spreading to patent hairy fruits (not tubercles absent and fruits wholly villous, hirsute or subtomentose).
Dwarf, caespitose perennial plant with many headed rootstock, suffruticose at base. Stem 1.5–6 cm long, fragile, prostrate-ascending to erect, many branched at base, glabrous to slightly puberulent, sometimes slightly winged on nerves, upper internodes elongate to 5 mm. Leaves in whorls of mostly 4, rarely 6, linear-lanceolate to narrow elliptic, 2–8 × 0.6–1.3 mm, 1 veined, glabrous to slightly puberulent, revolute at margin. Inflorescense dicashium, mostly terminal and also axillary, 8 to 75 flowered per stem; bracteoles absent. Pedicel glabrous, 1.5–2.5 mm in flowers, 2–5 mm in fruit. Calyx absent. Corolla 4 merious, yellowish-green to reddish-green, 1.2–1.8 mm diam; usually conical or campanulate, rarely infundibular; tube very reduced; lobes 0.5–1 × 0.4–0.7 mm, glabrous, triangular to lanceolate, mucronate at apex and apex incurved on petal inner surface. Stamen 0.4-0.6 mm long; anther yellow. Ovary 0.4–0.5 mm diam, dorsal and ventral surface of with densely transparent tubercles, lateral surface 0.2–0.4 mm spreading to patent hairy. Fruit depressed subglobose in fleshy, 0.5–0.75 mm, dorsal and ventral surface of with densely transparent tubercles, lateral surface 0.2–0.4 mm spreading to patent hairy.
This species is named in honour of retired Prof. Dr. Şinasi Yıldırımlı (Biology Dep. Hacettepe University, Turkey), who is an expert in Plant systematics and taxonomy. He described more than 100 new plant species for science in Turkey. The Turkish name of this species is given as “Levent İplikçiği”, according to the guidelines of
-G. cornigerum: –Turkey: Malatya: Levent Kanyonu inişi, kalker kayalıklar, 30.05.2012, H.Yıldırım 2386 (
-G. incanum subsp. pseudocornigerum: –Turkey: Sivas: Gürün-Pınarbaşı arası, Pınarbaşı’na 68 km kala, yol kenarı kayalık alan, 1662 m, 29.06.2016, H.Yıldırım 3948 (
-G. lasiocarpum: –Turkey: Elazığ: in Cappadocia, Aucher 694 (holotype G!).
G. sorgerae: –Turkey: Isparta: Dedegöl Da., 2200 m, 1 vii 1965, Sorger 65-42- 70 (isotype
Galium shinasii is a endemic for Eastern Anatolia. It’s known that is from Levent Canyon (Figure
The new species found in 3 populations. Two populations have been discovered in Malatya province, the other has been discovered in Erzincan province. Although the distribution area of Galium shinasii seems relatively wide, the populations of the area are very restricted. The total population area of G. shinasii was calculated as 0.2 km2 and approximately 500 individuals were observed in total. Probably it has still several undiscovered populations. No anthropogenic or grazing effects were observed on the population. According to the present data, following the criteria laid out by the IUCN (2012), the plant is categorized as ‘Vulnerable’ (VU) D1 + 2, on account of its restricted distribution.
Galium shinasii is a member of Galium Sect. Orientigalium Ehrend. It is characterized by chasmophyte, dwarf caespitose habit, very fragile 2–6 cm long stems, mostly 4 rarely 6 leaves in a whorl; 1.5–6.5 cm long leaves; flowers diam 1.2–1.8 mm; corolla yellowish-green to reddish-green; usually corolla lobes formed in a conical or campanulate corolla shape, very rarely lobes wholly opens and formed a infundibular corolla shape; fruit dorsal and ventral surface with densely transparent tubercles, lateral surface 0.2–0.4 mm spreading to patent hairy.
Although Galium shinasii shows some morphological similarities with G. lasiocarpum Boiss., G. sorgerae Ehrend. and Schönb., G. cornigerum Boiss. and Hausk. in sect. Orientigalium, it is easily distinguished from these by relatively smaller flowers; yellowish-green to reddish-green and very reduced tepals; fruit surface is not only hairy on lateral surface, and also dorsal and ventral surface with densely transparent tubercles. Also it shows slight morphological similarities to G. incanum Sm. subsp. pseudocornigerum Ehrend. with dwarf caespitose habit, smaller leaves and in having fruits lacking a calyx but it is easily distinguished from G. incanum subsp. pseudocornigerum by its especially more reduced and different coloured flowers, a greater numbers flower number per stem; smaller, depressed subglobose and long-hairy fruits.
The detailed of the morphological differences between Galium shinasii and related Galium species are summarized in the Table
Main differantial characters among Galium shinasii and close related species G. sorgerae, G. cornigerum and G. lasiocarpum.
Species Characters |
Galium shinasii | G. sorgerae | G. cornigerum | G. lasiocarpum |
---|---|---|---|---|
Stem | 1.5–6 cm, prostrate-ascending to erect, glabrous to slightly puberulent; sometimes slightly winged on nerves, | 3–4 cm, prostrate-ascending, densely hirsute | to 5 cm, prostrate-ascending, with very short, subvelutinous hairy | to 5 cm, erect to ascending, covered with straight spreading hair |
Leaves | 2–8 × 0.6–1.3 mm, linear-lanceolate to narrow elliptic; in whorls mostly 4, rarely 6 leafed | 4–6 × 0.7–1 mm, linear-oblanceolate or narrowly elliptic; in whorls 6 leafed; | 5–9 × 0.4–0.8 mm, linear, linear elliptic to lanceolate; in whorls 6 leafed | 6–10 × 1–1.5 mm, linear-elliptic; in whorls 6 leafed |
Inflorescence | very reduced, dicashium, mostly terminal and also axillar, 8 to 75 flowered per stem, never hidden by uppermost leaves | very reduced, few-flowered | mainly terminal reduced, corymbiform cymes, few-flowered, often ± hidden by uppermost leaves |
very reduced, subumbellate-capitate, 3–8 flowered, hidden by uppermost leaves |
Pedicel | 1.5–2.5 mm, glabrous, 2–5 mm in fruiting time | 2–3 mm, hirsute | 0–4 mm, subvelutinous hairy | 1–3 mm, hairy |
Calyx | absent | – | 2–4, subulate, persistent in fruit. | 0–2 |
Corolla | yellowish-green to reddish-green; 1.2–1.8 mm diam; | whitish when dry, infundibular, 2–2.5 mm diam | white, 4–5 mm diam | white or pink, 3.5–4 mm diam |
Fruit | dorsal and ventral surface with densely transparent tubercles, lateral surface 0.2–0.4 mm spreading to patent hairy. | hirsute | subtomentose | villous |
After adding this new species in science literature, the total number of Galium taxa were raised to 121 (105 species) in Turkey and 61 taxa are endemic for Turkey.
We are grateful to the curators of the following herbaria for allowing us to access to their Galium material for study: