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.

ARCTOTHECA

Elizabeth McClintock

Annual, perennial herb
Stems creeping or decumbent, spreading by stolons or rhizomes
Leaves generally pinnately lobed; basal in loose rosettes; cauline alternate
Inflorescence: heads radiate, solitary, long-peduncled; phyllaries overlapping in 3–6 series; receptacle flat, naked
Ray flowers generally sterile; ligules yellow
Disk flowers many; corolla funnel-shaped; stamen tips ovate-triangular, bases minutely sagittate; style slender below, thickened above a minutely hairy node, branches very short
Fruit 3–5-ribbed, glabrous or woolly; pappus of scales or 0
Species in genus: ± 6 species: s Africa, Australia
Etymology: (Greek: bear container)

Introduced

A. calendula (L.) Levyns

CAPEWEED


Stems creeping to decumbent, ribbed, soft, ± juicy, tomentose
Leaves 5–25 cm, pinnately lobed, or upper nearly entire; upper surface finely cobwebby; lower surface densely white-woolly
Inflorescence: heads ± 5 cm diam; peduncles scapose, 15–20 cm; outer phyllaries green, woolly, tips reflexed
Ray flowers < 20; ligules yellow above, greenish or purplish below
Disk flowers many, purplish or yellow
Fruit ± 3 mm, covered with woolly hairs; pappus scales ± obscured by woolly hairs
Chromosomes: 2n=18
Ecology: Disturbed, urban, coastal habitats
Elevation: < 250 m.
Bioregional distribution: North Coast, San Francisco Bay Area
Distribution outside California: native to s Africa
A vegetatively reproducing race is cultivated, sometimes escapes; Weedy.

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bioregional map for ARCTOTHECA%20calendula 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 Arctotheca calendula
Retrieve dichotomous key for Arctotheca
Overlay Consortium of California Herbaria specimen data by county on this map
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