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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.

 

HELIANTHELLA
Perennial herb from taprooted caudex. Stem: 1–several, erect. Leaf: basal and cauline, alternate or opposite; petioles short to long; blades generally 3-veined, linear to ± ovate, entire, ± scabrous. Inflorescence: heads radiate, 1–few, in cyme-like cluster; peduncles long, bracts 0–few, leaf-like; involucre hemispheric; phyllaries in 2–3 series, free; receptacle flat to ± convex, paleate, paleae folded around ovary, entire, obtuse, tip hairy. Ray flower: sterile; corolla yellow; style 0. Disk flower: many; corolla and anthers yellow or purple; style tips short-triangular. Fruit: thick or compressed; pappus 0 or 2 awns 1–2 mm (sometimes also crown of low scales).
9 species: western North America. (Latin: diminutive of Helianthus) [Weber 2006 FNANM 21:114–117]

Key to Helianthella

1. Outer phyllaries generally enlarged, leaf-like, incurved; involucre 2.5–4 cm diam; fruit center thick, edge thin ..... H. castanea

1' Outer phyllaries seldom enlarged or leaf-like, not incurved; involucre generally (1)1.5–2 cm diam; fruit compressed, thin ..... H. californica

2. Pappus 0; stem branched; cauline leaves generally opposite ..... var. californica

2' Pappus present; stem generally unbranched; cauline leaves generally alternate

3. Disk generally 1.5–2 cm diam; pappus generally of 2 awns or narrow scales, 1–2 mm, and crown of short scales; leaf blades oblong- or lance-linear, (1.5)2–4(4.5) cm wide, heads generally 2–3 ..... var. nevadensis

3' Disk generally 1–1.5 cm diam; pappus generally of 2 awns, 1 mm; leaf blades linear to lance-linear (narrowly ovate), 3–6(18) mm wide; heads generally 1 ..... var. shastensis

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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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