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FOC | Family List | FOC Vol. 20-21 | Asteraceae | Taraxacum

6. Taraxacum sect. Tibetana Soest, Wentia. 10: 41. 1963.

西藏蒲公英组 xi zang pu gong ying zu

Plants usually small, delicate. Petiole ± unwinged; leaf blade usually with recurved lateral segments, their distal margin often sigmoid. Outer phyllaries (5-)9-13(-22), black or black green, not imbricate or ± imbricate, ovate-lanceolate, lanceolate, or sometimes linear-lanceolate, appressed, unbordered or less often with a pale border, apex flat or callose. Stigmas usually black or blackish green, rarely yellow. Achene usually 4-5.5 × (1-)1.2-1.4 mm; body most often densely shortly spinulose or squamulose above, sometimes with longer erect spinules, gradually to subabruptly narrowing into a conic to thickly subcylindric 0.6-1.7 mm cone; beak 5-10 mm. Pappus white or yellowish, 5-8 mm. Sexual or agamospermous.

About 25 species: highest diversity in S Xizang, N Yunnan, and W Sichuan; 17 species (15 endemic) in China.

In China this section contains sexual species with wider variation ranges (i.e., Taraxacum apargiiforme and T. eriopodum) and an array of agamospermous species, which are usually known from only rather scanty material.


1 Pollen absent   (2)
+ Pollen present   (5)
       
2 (1) Stigmas yellow.   32 T. atrocarpum
+ Stigmas blackish to dark grayish green   (3)
       
3 (2) Outer phyllaries unbordered.   31 T. suberiopodum
+ Outer phyllaries with a distinct whitish or whitish green 0.2-0.7 mm wide border   (4)
       
4 (3) Outer phyllaries 19-22, border 0.5-0.7 mm wide.   42 T. delicatum
+ Outer phyllaries 10 or 11, border ca. 0.2 mm wide.   43 T. centrasiaticum
       
5 (1) Pollen grains regular in size   (6)
+ Pollen grains irregular in size   (7)
       
6 (5) Outer phyllaries 15-18; involucre base broadly rounded; achene cone 1-1.5 mm.   29 T. eriopodum
+ Outer phyllaries 11-13; involucre base obconic; achene cone 0.6-0.7 mm.   37 T. apargiiforme
       
7 (5) Stigmas yellow.   33 T. mutatum
+ Stigmas blackish to dark grayish green   (8)
       
8 (7) Outer phyllaries with a distinct whitish border   (9)
+ Outer phyllaries unbordered or with an indistinct paler border to 0.1 mm wide   (11)
       
9 (8) Leaf lateral lobes in 5-9 pairs; outer phyllaries not imbricate.   35 T. subcoronatum
+ Leaf lateral lobes in 2-4 pairs; outer phyllaries ± imbricate   (10)
       
10 (9) Outer phyllary border 0.3-0.4 mm wide; leaf lateral lobes not remote.   40 T. chionophilum
+ Outer phyllary border ca. 0.2 mm wide; leaf lateral lobes remote.   43 T. centrasiaticum
       
11 (8) Outer phyllaries usually 7-9 mm.   30 T. tibetanum
+ Outer phyllaries usually 4-7 mm   (12)
       
12 (11) Outer phyllaries densely ciliate   (13)
+ Outer phyllaries ± glabrous or very sparsely ciliate   (15)
       
13 (12) Achene dark grayish olivaceous, light straw-colored brown when unripe; cone conic.   39 T. apargia
+ Achene reddish brown to dark reddish brown, ochraceous reddish when unripe; cone cylindric to subcylindric   (14)
       
14 (13) Achene 3.9-4.2 mm.   44 T. austrotibetanum
+ Achene 4.3-5.1 mm.   45 T. suavissimum
       
15 (12) Leaves undivided but margin sometimes remotely minutely denticulate.   41 T. staticifolium
+ Leaves pinnatilobed, pinnatisect, or at least lobulate   (16)
       
16 (15) Outer phyllaries 5-9; involucre 5-7 mm wide; leaf terminal lobe elongated.   38 T. mastigophyllum
+ Outer phyllaries 10-14; involucre 8-10 mm wide; leaf terminal lobe not elongated   (17)
       
17 (16) Ligules deep yellow; outer phyllaries 2-3 mm wide.   34 T. przevalskii
+ Ligules pale yellow; outer phyllaries 1.5-2.2 mm wide.   36 T. roseoflavescens

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