Agoseris retrorsa Greene

Spearleaf agoseris (en)

Species

Angiosperms > Asterales > Asteraceae > Agoseris

Characteristics

Stems 0. Leaves erect to ascending; petioles often purplish; blades linear to linear-elliptic, (7–)10–30(–36) cm, margins usually lobed to pinnatifid, rarely toothed or entire, lobes (4–)7–9(–11) pairs, linear to lanceolate, mostly retrorse, sometimes spreading, lobules often present, faces sparsely villous to tomentose. Peduncles elongating after flowering, 15–65(–94) cm in fruit, ± glabrate, or apically villous to tomentose, eglandular. Involucres cylindric to obconic or campanulate, 4–6 cm in fruit. Phyllaries in 3–5 series, medially rosy purple or all green, lacking darker spots or midstripes, margins ciliate to tomentose, faces glabrous or villous, eglandular; outer erect to spreading, adaxially glabrous or tomentose; inner erect, often precociously elongating and much surpassing outer. Receptacles epaleate. Florets 10–100; corollas yellow, tubes 8–20 mm, ligules 6–15 × 1.5–2.5 mm; anthers 2–5 mm. Cypselae (15–)20–31 mm, bodies narrowly obconic, 5–7 mm, beaks (10–)15–25 mm, lengths mostly 3–4 times bodies; ribs strongly ridged, straight, often minutely cinereous-pannose; pappus bristles in 4–6 series, (11–)15–20 mm. 2n = 18.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
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Environment

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Hardiness (USDA) 4-10

Usage

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Cultivation

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Images

Agoseris retrorsa unspecified picture

Distribution

Agoseris retrorsa world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:7290-2
WFO ID wfo-0000117940
COL ID B2DM
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Agoseris retrorsa Agoseris retrorsa Troximon retrorsum Macrorhynchus angustifolius Macrorhynchus retrorsus