Family: Asteraceae
Erigeron
Citation:
L., Sp. Pl. 863 (1753).
Derivation: A name used by Theophrastus for Senecio vulgaris, apparently from the Greek er, spring; and geron, an old man; referring to the hoary appearance of some species growing in spring.
Synonymy: Not Applicable Common name: Fleabanes.
Description:
Annual or perennial herbs, rosette-forming or with spreading wiry branches; leaves alternate, radical and cauline, usually dentate.
Capitula terminal, pedunculate, solitary or in loose corymbs or panicles, radiate, heterogamous; involucres hemispherical to campanulate, becoming reflexed in fruit; bracts subequal, herbaceous with scarious margins, imbricate in 2-4-series; receptacle naked, pitted, flat to convex; ray florets female, 2-seriate; ligules often prominent, white to purple; disk florets bisexual, yellow; anthers obtuse at the base, with a short acute appendage at the apex; style branches with triangular papillose terminal appendages.
Achenes flattened, pubescent; pappus of bristles.
Distribution:
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About 200 species, cosmopolitan but mainly native to North America; about 6 species in Australia.
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Biology:
No text
Key to Species:
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1. Receptacle 2-3 mm diam.; peduncles and leaves sparsely pubescent with appressed microscopic hairs |
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E. karvinskianus 1. |
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1. Receptacle 5-9 mm diam.; peduncles and leaves densely pilose with microscopic hairs |
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E. sessilifolius 2. |
Author:
Not yet available
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