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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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

ASTERACEAE

SUNFLOWER FAMILY

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.

CHAENACTIS

PINCUSHION

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.

Native

C. alpigena Sharsm.

Perennial, scapose, cespitose to ± matted
Stems generally several, erect to prostrate, < 10 cm, tomentose near base, hairs generally thinning with age
Leaves < 4 cm, densely tomentose, rarely becoming glabrous, not fleshy; basal rosette persistent; largest blades linear to obovate, curled and 1–2-pinnately lobed (s plants) to flat and ± palmately lobed or entire (n plants), 1° lobes 2–7 pairs, ± crowded, longest near middle
Inflorescence: heads 1 per stem; peduncles < 10 cm; involucre obconic to cylindric, ± tomentose, glandless; longest phyllaries 9–14 mm, tips erect, ± rigid, blunt
Flowers: corollas radial, 5.5–8 mm, ± equal, white to pinkish
Fruit 5–8 mm; pappus scales 8–20 in indistinct series, ± equal, longest 5–8.5 mm
Ecology: Loose sand or gravel
Elevation: 2300–4000 m.
Bioregional distribution: c&s High Sierra Nevada, White and Inyo Mountains (n White Mtns)
Distribution outside California: w Nevada
Flowering time: Summer

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bioregional map for CHAENACTIS%20alpigena being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Chaenactis alpigena
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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