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

3. Erigeron sect. Phalacroloma (Cassini) Torrey & A. Gray, Fl. N. Amer. 2: 175. 1841.

一年蓬组 yi nian peng zu

Phalacroloma Cassini in F. Cuvier, Dict. Sci. Nat. 39: 404. 1826; Achaetogeron A. Gray; Polyactidium Candolle; Stenactis Cassini.

Herbs, annual or biennial [or short-lived perennial], fibrous-rooted [rarely rhizomatous, caudex simple]; herbage strigose to sparsely hirsute. Stems branched. Leaves basal and cauline, oblanceolate, base not clasping, margin serrate. Capitula nodding in bud, numerous in loosely corymbiform or paniculiform synflorescences. Ray floret lamina narrowly strap-shaped, white, spreading, not coiling or reflexed. Achenes (0.5-)0.8-1.2 mm, 2(-4)-veined. Pappus 2-seriate, outer of scales, bristles of ray florets absent [or present], of disk florets 8-15, not accrescent.

Twenty-one species: Asia, North America; two species (both introduced) in China.


1 Stems sparsely hispid, strigose above; basal leaves withered at anthesis, lower cauline similar; leaf margin coarsely serrate to sometimes entire.   29 E. annuus
+ Stems sparsely to moderately strigose to strigillose or hirsute-strigillose; basal leaves persistent at anthesis, cauline gradually reduced; leaf margin entire or ± deeply serrate to crenate.   30 E. strigosus

Lower Taxa


 

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