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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

HYMENOXYS

Mark W. Bierner


Annual to perennial herb, 5–150 cm. Stem: erect, unbranched or branched, green to ± red-purple, glabrous or ± hairy. Leaf: basal and cauline, alternate, simple, entire or 1–2-pinnately lobed or divided, ultimate margins entire or toothed, glabrous or hairy, ± gland-dotted. Inflorescence: heads radiate [discoid], 1 or in panicle-like or ± flat-topped clusters; peduncle expanded distally, glabrous or ± hairy; disk ± hemispheric to spheric, bell-shaped or urn-shaped; involucre ± rotate; phyllaries in 2[3] series, generally unequal, outer basally fused, inner free; receptacle conic to ovoid, hemispheric or ± spheric [flat], pitted, epaleate. Ray flower: [3]8–26[34+], pistillate; corolla generally yellow or yellow-orange to orange, ray fan-shaped, 3(5)-lobed. Disk flower: 25–150(400+), bisexual [6–15, staminate]; corolla yellow; anther tip triangular; style tips truncate. Fruit: ± narrowly obpyramidal [obconic], generally 5-angled, glabrous or hairy; pappus of generally obovate, generally awn-tipped scales [0].
25 species: western North America, South America. (Greek: sharp membrane, from pappus) [Bierner 2006 FNANM 21:435–443] Hymenoxys acaulis moved to Tetraneuris.
Unabridged references: [Bierner 2001 Lundellia 4:37–63]

Key to Hymenoxys

1. Leaf entire — outer phyllaries >= 11 mm, inner >= 7.5 mm ..... H. hoopesii

1' Leaf entire or 1–2-pinnately divided into linear lobes

2. Annual ..... H. odorata

2' Biennial or per

3. Biennial or perennial herb, (1)2–8(10) dm, flowering once; stems 1–3(15); leaf ± hairy ..... H. cooperi

3' Perennial herb 3–5 dm, flower > once; stems 3–10(15); leaf glabrous or sparsely hairy ..... H. lemmonii

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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