Lapsanastrum in Flora of China @ efloras.org

67. Lapsanastrum Pak & K. Bremer, Taxon. 44: 19. 1995.

稻槎菜属 dao cha cai shu

Herbs, annual or short-lived perennial, rosulate. Leaves pinnatipartite or pinnatisect. Capitula usually nodding, in fruit with 6-20 florets. Involucre narrowly cylindric at anthesis, broader in fruit, less than 7 mm, glabrous. Outer phyllaries much shorter than inner ones; inner phyllaries linear-lanceolate to lanceolate, of equal length, becoming broader in fruit. Receptacle naked. Florets yellow. Achene narrowly ellipsoid, subcompressed, with 5 main ribs and each accompanied by 1(or 2) secondary ribs, apex truncate but with 0 or (1 or)2-4 main ribs apically prolonged into 0.2-2.2 mm slender hooked appendages. Pappus absent.

Four species: China, Japan, Korea; four species (two endemic) in China.

A morphological phylogenetic analysis by Pak and K. Bremer (Taxon 44: 13-21. 1995) revealed that the E Asian species of Lapsana Linnaeus are rather distant to the remainder of this genus and instead probably related to Youngia. Therefore, the four species have been transferred by these authors to a new genus, Lapsanastrum. The close relationship to Youngia and distance from Lapsana have been fully confirmed by a recent molecular phylogenetic analysis of subtribe Crepidinae (J. W. Zhang et al., in prep.).

1 Inner phyllaries 8; achene without apical hooked projections (2)

+ Inner phyllaries 5(or 6); achene usually with (1 or)2-4 apical hooked projections or rarely absent (3)

2 (1) Plants without creeping stems; flowering stems to 50 cm tall, with several capitula. 1 L. humile

+ Plants with creeping stems; flowering stems less than 10 cm tall, with 1 or 2 capitula. 2 L. takasei

3 (1) Achene with (1 or)2 slender hooked 0.2-1 mm projections. 3 L. apogonoides

+ Achene with 2-4 slender hooked 1.2-2.2 mm projections. 4 L. uncinatum

Lower Taxa