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

141. Erigeron Linnaeus, Sp. Pl. 2: 863. 1753.

飞蓬属 fei peng shu

Authors: Yilin Chen & Luc Brouillet

Herbs, perennial, sometimes annual or biennial, or sometimes subshrubs. Leaves alternate, margin entire, serrate, or lobed. Capitula radiate, sometimes disciform or rarely discoid, solitary or several, sometimes numerous, in racemiform, corymbiform, or paniculiform synflorescences. Involucre hemispheric to campanulate or turbinate to cylindric; phyllaries 2-5-seriate, subequal, sometimes outer ones shorter, sometimes ± imbricate, linear-lanceolate to linear, membranous or herbaceous, margin scarious, midvein reddish brown, purplish, or green. Receptacles flat to slightly convex or conic, ± alveolate, naked. Ray florets fertile, rarely absent (discoid capitula) or 12-350, 1-5- or more seriate, inner series lamina reduced and/or elaminate, or all reduced or elaminate (disciform capitula), lamina purple, blue, pink, or white, rarely yellow or orange, usually short and narrow, sometimes ± broad; disk florets bisexual, 3-450, yellow (veins often orange), sometimes white, limb cylindric to narrowly funnelform [rarely campanulate], lobes (4 or)5, deltate; anther base obtuse, apical appendages ovate-lanceolate; style branch tips deltate, obtuse or arcuate. Achenes oblong or oblong-lanceoloid to oblong-obovoid, compressed to flattened, glabrous or sparsely to densely strigose or strigillose to sericeous, eglandular, 2(or 4)-veined, veins often orange. Pappus persistent or caducous, free or ± basally connate, 1- or 2-seriate, outer series of short setae or scales, inner of 5-40(-50) fine, barbellate or barbellulate bristles, sometimes pappus only on ray or only on disk achenes [or absent].

About 400 species: Asia, Europe, North America, a few in Africa and Australia; 39 species (14 endemic, six introduced) in China.

The sections of Erigeron used here follow Nesom (Lundellia 11: 8-38. 2008), except that the polyphyletic Conyza s.s. is included within the genus, as E. sect. Caenotus and E. sect. Conyza.

Key to sections

1 Ray florets 1-3-seriate, lamina strap-shaped (sometimes narrowly), usually spreading   (2)
+ Ray florets 4- or 5-seriate, sometimes elaminate or lamina filiform, erect   (4)
2 (1) Pappus of ray florets of short scales, without bristles, of disk florets 2-seriate, outer series of short scales, inner of 10-15 bristles; capitula numerous in corymbiform synflorescences; herbs annual or biennial; capitula nodding in bud.   3 E. sect. Phalacroloma
+ Pappus of ray and disk florets 2-seriate, outer of short scales or bristles, inner of bristles; capitula 1-5 terminal or from upper branches; herbs perennial, rarely annual or biennial; capitula erect in bud   (3)
3 (2) Leaves mostly basal, margin entire; capitula solitary.   1 E. sect. Erigeron
+ Leaves mostly cauline (basal withered at anthesis), margin serrate or lobed; capitula 1-5 from upper branches.   2 E. sect. Karvinskia
4 (1) Ray florets in 2 zones, outer 1-3 series laminate, inner 2 elaminate; achenes 2-2.4 mm; pappus accrescent.   4 E. sect. Trimorpha
+ Ray florets not in 2 zones, laminate or elaminate; achenes 0.8-2 mm; pappus not accrescent   (5)
5 (4) Leaf margin entire or sparsely serrate.   5 E. sect. Caenotus
+ Leaf margin coarsely serrate or lobed, rarely entire.   6 E. sect. Conyza

  • List of lower taxa


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