Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit 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.

CHLORACANTHA

Guy L. Nesom


Species in genus: 1 sp.: sw US, Mex, C.Am
Etymology: (Latin: green thorns)
Reference: [Nesom et al. 1991 Phytologia 70:371–381]

Native

C. spinosa (Benth.) G.L. Nesom var. spinosa

Subshrub from stout rhizome, ± glabrous
Stems erect, 5–15(25) dm; branches sometimes thorn-like
Leaves alternate, 10–50 cm, oblanceolate, generally entire, 1-veined, early deciduous
Inflorescence: heads radiate, few–many in loose clusters; phyllaries in (3)4–5 series, inner 4.5–7.5 mm, ± lanceolate, veins (1)3(5), parallel, orange-resinous, tips generally rounded, margins transparent; receptacle naked
Ray flowers 10–33; corollas 4–8(11) mm, white, ligules 1–2 mm wide, coiled at maturity
Disk flowers many; corollas 3–6 mm, yellow; style appendages ± deltate
Fruit 1.5–3.5 mm, slightly compressed, glabrous; veins 5(6), whitish to golden-brown; pappus of many barbed bristles in ± 2 series, outer generally << inner
Chromosomes: 2n=18
Ecology: Seeps, moist streamsides, ditches, sometimes saline or drier areas
Elevation: < 1250 m.
Bioregional distribution: Peninsular Ranges, Sonoran Desert
Distribution outside California: to Utah, south-central US, Mexico
Flowering time: Jun–Dec
Synonyms: Aster s. Benth

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bioregional map for CHLORACANTHA%20spinosa%20var.%20spinosa 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 Chloracantha spinosa var. spinosa
Retrieve dichotomous key for Chloracantha
Overlay Consortium of California Herbaria specimen data by county on this map
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