Jepson Flora Project: Jepson Interchange    

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

Perennial, scapose, cespitose to ± matted
Stems several, erect to ± spreading, < 10 cm, tomentose near base; hairs generally thinning with age
Leaves < 12 cm, loosely tomentose, not fleshy; basal rosette persistent; largest blades linear to narrowly elliptic, 1–2-pinnately lobed, 1° lobes (7)10–many pairs, crowded to ± densely packed, longest near middle, tips curled to twisted
Inflorescence: heads 1(–3) per stem; peduncles < 25 cm; involucre obconic to cylindric, glandular-hairy; longest phyllaries 8–13 mm, tips erect, ± rigid, generally blunt
Flowers: corollas all radial, 5–7 mm, ± equal, white to pinkish
Fruit 4–6 mm; pappus scales 10–16 in indistinct series, ± equal, longest 3–4.5 mm
Chromosomes: 2n=12
Ecology: Open sand or gravel
Elevation: 1500–2800 m.
Bioregional distribution: s-most Sierra Nevada, Transverse Ranges. Closely related to C. douglasii var. alpina
Horticultural information: TRY.

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bioregional map for CHAENACTIS%20santolinoides being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Chaenactis santolinoides
Retrieve dichotomous key for Chaenactis
Retrieve multiple-entry key (MEKA) for Chaenactis
Overlay Consortium of California Herbaria specimen data by county on this map
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