|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1many 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)45; stamens 45, 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):128. See glossary p. 25 for illustrations of general family characteristics.
Species in genus: 1 sp
Etymology: (Greek: eyelash girdle, from fruits weakly held by phyllaries)
Annual 318 dm, strongly scented
Stem generally 1, erect, much-branched, soft-hairy to bristly, puberulent, ± glandular
Leaves basal and lower cauline 415 cm, crowded; blades linear, entire or serrate, often withering in flower; cauline alternate, generally subtending smaller leaf clusters, base 13 cm wide; clustered leaves < cauline, margins with tack-shaped glands
Inflorescence ± glandular; heads radiate, axillary or terminal, in a narrow to open panicle; bracts generally glandular-ciliate; involucre 57.5 mm, hemispheric; phyllaries 1 per ray flower, elliptic, hairy and often glandular, base closely appressed to ovary, tip free, acute; chaff scales between ray and disk flowers, = phyllaries, flat
Ray flowers 513; corolla 69 mm; ligule 58 mm, white, red-veined
Disk flowers 1035; corolla 45.5 mm, white, throat > tube, lobes 0.5 mm; anthers brown; style branches tapered, short-bristly
Fruit 3.54 mm, club-shaped, 10-ribbed, densely puberulent, ± dark; ray pappus 0 or minute crown, sometimes of narrow, plumose scales < 1 mm; disk pappus 1.53 mm, scales 1520, narrow, plumose, sometimes 0 or reduced to crown
Ecology: Dry grassy areas
Elevation: < 1100 m.
Bioregional distribution: w San Joaquin Valley, e San Francisco Bay Area, South Coast Ranges.