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

5. Taraxacum sect. Calanthodia (Dahlstedt) R. Doll, Gatt. Taraxacum. 59. 1974.

大头蒲公英组 da tou pu gong ying zu

Taraxacum [unranked] Calanthodia Dahlstedt, Acta Horti Gothob. 2: 144. 1926.

Plants robust. Petiole often winged; leaf blade shallowly to deeply lobed. Capitulum 3-6 cm wide. Involucre usually more than 1.5 cm wide. Outer phyllaries usually more than 10 × 4 mm, imbricate or not so, broadly ovate to lanceolate, appressed or rarely to patent, border usually distinct and pale, apex usually corniculate. Ligules yellow. Stigmas dark. Achene dark brown to straw-colored brown, large, usually 4.5-5.5 × 1.1-2 mm, ± densely spinulose above, subabruptly to abruptly narrowing into usually thick subconic to subcylindric 0.8-1.4 mm cone; beak usually 8-10 mm. Pappus white.

● Eight species: China.

The highest diversity of this section is in Sichuan. Sexuality is relatively common in this section.


1 Outer phyllaries erect-patent to patent.   25 T. grypodon
+ Outer phyllaries appressed to erect   (2)
       
2 (1) Achene 0.9-1 mm thick   (3)
+ Achene 1.1-2 mm thick   (4)
       
3 (2) Stigmas yellow to greenish yellow, rarely in populations plants with blackish green stigmas; outer phyllaries 9-14, usually narrowly lanceolate to ovate-lanceolate.   23 T. peccator
+ Stigmas black; outer phyllaries 13-17, usually ovate to ovate-lanceolate.   24 T. forrestii
       
4 (2) Achene cone 1.2-1.4 mm   (5)
+ Achene cone 0.4-1.1 mm   (6)
       
5 (4) Leaves undivided to shallowly lobed, lateral lobes 3-5, interlobes well developed and entire.   22 T. platypecidum
+ Leaves deeply pinnatisect, lateral lobes 5 or 6, interlobes with a large acute tooth or lobule.   24 T. forrestii
       
6 (4) Outer phyllaries without a paler border or border green, very narrow, and indistinct   (7)
+ Outer phyllaries with a distinct paler (whitish to greenish white) border   (8)
       
7 (6) Outer phyllaries 17-25, lanceolate to narrowly lanceolate; achene 1.2-1.4 mm thick.   26 T. lanigerum
+ Outer phyllaries 11-19, broadly ovate to ovate-lanceolate; achene 1.5-2 mm thick.   27 T. lugubre
       
8 (6) Outer phyllaries narrowly lanceolate to linear-lanceolate, 1.2-1.5 cm; stigmas blackish purple but probably brownish gray when fresh.   28 T. pseudonutans
+ Outer phyllaries broadly ovate to ovate-lanceolate, 0.6-1.3 cm; stigmas black, blackish green, or deep green   (9)
       
9 (8) Outer phyllaries 2-4.5 mm wide; plants not robust, usually less than 10 cm tall.   24 T. forrestii
+ Outer phyllaries 4-8 mm wide; plants robust, 10-35 cm tall   (10)
       
10 (9) Pappus 8-11 mm.   21 T. calanthodium
+ Pappus 6-7.5 mm.   27 T. lugubre

Lower Taxa


 

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