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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.



James D. Morefield

Annual to subshrubs, generally ± hairy
Leaves alternate or basal, generally petioled, reduced upward, entire and linear or generally elliptic to ovate or obovate and 1–4-pinnately lobed; 1° lobes longest near middle or base of blade
Inflorescence: heads discoid (but outer flowers often enlarged, ± ray-like), 1–many per stem, generally in terminal cymes; peduncle generally hairy like phyllary bases; involucre generally < 15 mm diam, cylindric to obconic or hemispheric; phyllaries in 1–2 ± equal series, generally linear to lanceolate, tips generally ± flat, generally ± green; receptacle flat to rounded, generally naked
Flowers 10–many; corollas radial (outer, if enlarged, ± bilateral), generally white to pinkish or yellow, generally opening in daytime; anthers generally exserted
Fruit club-shaped, generally not compressed, stiffly hairy; pappus 0 or of 4–20 fringed scales in 1–few series
Species in genus: 18 species: w North America
Etymology: (Greek: gaping ray, from enlarged outer corollas of some)
Reference: [Mooring 1980 Amer J Bot 67:1304–1309]
Spp. of sect. Chaenactis hybridize.


C. stevioides Hook. & Arn.


Annual, branched above or below, sometimes ± scapose
Stems 1–many, erect, < 45 cm, cobwebby (at least thinly so near base); hairs thinning with age
Leaves < 11 cm, ± cobwebby, generally not fleshy; basal rosette generally withering; largest blades 1–2-pinnately lobed, lobes 4–8 pairs, crowded to well separated, longest near middle, tips generally curled
Inflorescence: heads generally several per stem; peduncles < 11 cm; involucre obconic to hemispheric, glandular-hairy or ± cobwebby; longest phyllaries 5.5–8(10) mm, tips erect, ± rigid, generally blunt
Flowers: corollas white to pink, rarely pale yellow, outer bilateral, greatly enlarged, inner radial, 4.5–6.5 mm
Fruit 4–6.5 mm; pappus scales 4–5 in 1(–2) series, scales of outer fruit < inner, unequal, scales of inner fruit equal to unequal, longest 1.5–6 mm
Chromosomes: 2n=10
Ecology: Common. Open flats, slopes
Elevation: < 2100 m.
Bioregional distribution: Inner South Coast Ranges, East of Sierra Nevada, Desert
Distribution outside California: to se Oregon, sw Idaho, w Colorado, sw New Mexico, nw Mexico
Flowering time: Spring
Synonyms: var. brachypappa (A. Gray) H.M. Hall; C. mexicana Stockw
Highly variable, but not clearly divisible. SCoRI plants resemble C. gillespiei Stockw. of c AZ (stem ± glabrous, leaf lobes elongate). See also C. carphoclinia
Horticultural information: TRY.

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bioregional map for CHAENACTIS%20stevioides being generated

Retrieve Jepson Interchange Index to Plant Names entry for Chaenactis stevioides
Retrieve dichotomous key for Chaenactis
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