Tulipa (sect. Biflores) A. D. Hall ex Veldkamp & Zonn

5. Sect. Biflores A.D.Hall ex Veldkamp & Zonn. in Pl. Syst. Evol. 298(1): 89 (2012) Type:— Tulipa biflora Pall. in Reise Russ. Reich. 3(2): App. 727 (1776). Identification key for the species of sect. Biflores distributed in Uzbekistan 1. Upper part of stem and peduncle pubescent (except T. biflora and T. sogdiana), with a short style; flower is whitish with yellow blotch; plants of plains, foothills and mid-mountains, up to 2400–2500 m.......................................................................................2 – Upper part of stem and peduncle glabrous, with a long style; flower is pale yellow or whitish; plants of high mountains, above 2400–2500 m......................................................................................................................................................................................6 2. Filaments glabrous. Grows in Kyzylkum and adjacent arid plains...............................................................................1. T. sogdiana – Filaments with a ring of hairs at the base and wispy hairs along their length....................................................................................3 3. Bulb tunic papery; stem and peduncle glabrous; filaments bearded at the base. Grows in Ustyurt plateau.................... 2. T. biflora – Bulb tunic coriaceous or thin coriaceous; filaments with wispy, white hairs along the length. Grows in arid plains, Tian-Shan and Pamir-Alay mountains........................................................................................................................................................................4 4. Leaves widely spaced, commonly much shorter than the flower.................................................................................3. T. buhseana – Leaves more or less widely spaced, commonly longer than the flower.............................................................................................5 5. Bulb tunic tough and dark brown, at the upper part densely clothed with long silky hairs. Grows in Pamir-Alay mountains ………………………………………………………. 4. T. turkestanica – Bulb tunic tough reddish-brown or pink, densely lined with cobwebby hairs increasing to a tuft at the apex. Grows in West TianShan mountains.......................................................................................................................................................5. T. bifloriformis 6. Bulb tunic finely cobweb-hairy on the inner surface; leaves set closely, commonly opposite; flower whitish with yellow blotch, outer segments dingy violet on the back; filaments with hairs at the base; anthers violet. Grows in Hissar range............................................................................................................................................................................................................... 6. T. orithyioides – Bulb tunic covered with hairs in the upper part; leaves rather widely spaced; flower bright yellow; outer segments brownish or greenish on the back; filaments pubescent over the entire surface; anthers yellow...........................................................................7 7. Bulb tunic usually light-brown or brown, papery, glabrous or covered with few straight, adpressed, white hairs at tip...................................................................................................................................................................................................... 7. T. dasystemon – Bulb tunic black to tawny, thin coriaceous, densely lined with woolly hairs at tip......................................... 8. T. dasystemonoides
Published as part of Tojibaev, Komiljon, Dekhkonov, Davron, Ergashov, Ibrokhimjon, Sun, Hang, Deng, Tao & Yusupov, Ziyoviddin, 2022, The synopsis of the genus Tulipa (Liliaceae) in Uzbekistan, pp. 163-214 in Phytotaxa 573 (2) on page 198, DOI: 10.11646/phytotaxa.573.2.2, http://zenodo.org/record/7349887