Jepson Flora Project: Jepson Interchange    

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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. carphoclinia A. Gray


Annual, branched above middle
Stem generally 1, ± erect, < 7 dm, whitish granular-puberulent below and generally on leaves; hairs thinning with age
Leaves < 11 cm, generally not fleshy; basal rosette withering; largest blades (2)3–4-pinnately lobed, 1° lobes 2–7(10) pairs, ± crowded, longest near base, tips ± cylindric
Inflorescence: heads generally several per stem; peduncles < 7 cm; involucre cylindric to hemispheric, glandular- or wavy-hairy; longest phyllaries 7–10 mm, tips (at least of inner) erect, rigid, acuminate, needle-like, cylindric, generally reddish; receptacle generally ± chaffy, chaff resembling phyllaries
Flowers: corollas radial, 4–6 mm, white to pinkish, outer spreading but barely enlarged
Fruit 3–4 mm; pappus scales in 1 series, scales of outer fruit (0–)4, unequal, < inner, scales of inner fruit 4, equal, longest 3–5 mm
Ecology: Generally open rocks or gravel
Elevation: < 1900 m.
Bioregional distribution: e Peninsular Ranges, East of Sierra Nevada, Desert
Distribution outside California: to Utah, Arizona, nw Mexico
Flowering time: Spring.
Often mistaken for C. stevioides but closer to C. artemisiifolia.


var. peirsonii (Jeps.) Munz


Stem generally 4–6 dm
Leaves generally basal, longest 7–10 cm; petiole stout, hard, base strongly enlarged
Ecology: Habitats of sp
Elevation: < 500 m.
Bioregional distribution: eastern Peninsular Ranges (eastern Santa Rosa Mtns), adjacent w Sonoran Desert?
Flowering time: Mar–Apr
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for CHAENACTIS%20carphoclinia%20var.%20peirsonii being generated

Retrieve Jepson Interchange Index to Plant Names entry for Chaenactis carphoclinia var. peirsonii
Retrieve dichotomous key for Chaenactis
Retrieve multiple-entry key (MEKA) for Chaenactis
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
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