Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.


Perennial from taproot and caudex
Stems 1–several, erect
Leaves 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 cymes; peduncles long, with 0–few leaf-like bracts; involucre hemispheric; phyllaries in 2–3 series, free; receptacle flat to ± convex, chaff scales folded around ovary, entire, obtuse, tip hairy
Ray flowers sterile; corolla yellow; style 0
Disk flowers 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)
Species in genus: 8 species: w North America
Etymology: (Latin: diminutive of Helianthus )
Reference: [Weber 1952 Amer Midl Naturalist 48:1–35]


H. castanea Greene


Stems 1–5 dm, glabrous to coarsely hairy
Leaves: cauline few; petioles long; blades 2–6 cm wide, narrowly to widely elliptic
Inflorescence: head generally 1; peduncle 7–20 cm, stout, ± rough-hairy, often with 1–few bracts near tip; involucre 2.5–4 cm diam; outer phyllaries generally leaf-like, 3–10 cm, 7–20 mm wide, curving up around head; inner phyllaries 2–2.5 cm, coarsely ciliate
Ray flowers 13–21; ligules 1–3 cm
Disk flowers: corollas 6–7 mm, yellow; anthers yellow
Fruit 8–10 mm, obovate, glabrous; center thick; edges thin; pappus awns 0 or 2, < 1 mm
Chromosomes: 2n=30
Ecology: Open, grassy sites
Elevation: 200–1300 m.
Bioregional distribution: n San Francisco Bay Area
Horticultural information: In cultivation.
See the CNPS Inventory for information about endangerment and rarity.
previous taxon | next taxon
bioregional map for HELIANTHELLA%20castanea being generated

Retrieve Jepson Interchange Index to Plant Names entry for Helianthella castanea
Retrieve dichotomous key for Helianthella
Retrieve multiple-entry key (MEKA) for Helianthella
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California