|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.
Annual, densely glandular, strongly scented
Leaves alternate or lower opposite, linear to oblanceolate, entire to lobed; upper reduced, often with axillary leaf clusters, tipped by open-pit glands
Inflorescence: heads radiate, in flat-topped to panicle-like clusters; phyllaries half-enclosing ray ovaries, falling with fruits, back with stalked, open-pit glands, tip cylindric, gland-tipped; receptacle chaffy
Ray flowers 316; ligules 3-lobed (middle narrowest), yellow
Disk flowers fewmany, most sterile; corolla yellow; anther tips widely triangular; style branches tapered
Fruit: pappus 0; ray achenes ± 3-angled, short-beaked, dark; disk achenes ± club-shaped
Species in genus: 4 species: CA
Etymology: (Greek: wholly chaffy, from receptacle)
Reference: [Palmer 1982 PhD Univ CA Davis]
± identical forms often intersterile.
Stems 212 dm; branches glandular throughout, hairy below, densely gray-puberulent above
Leaves canescent; lower 310 cm; upper densely glandular
Inflorescence raceme- to panicle-like; peduncle bracts 25 mm, overlapping, appressed to ± recurved, flat, gland-tipped; involucres 56 mm, ± hemispheric; phyllaries with 2550 very slender gland-tipped projections, puberulent, sticky; receptacle 12 mm diam, rounded
Ray flowers 310; ligules 56.5 mm
Disk flowers 922; corollas 3.55 mm; anthers yellow
Fruit: ray achenes 2.54 mm
Ecology: Grassy slopes
Elevation: < 1300 m.
Bioregional distribution: Sierra Nevada Foothills, Tehachapi Mountain Area, San Joaquin Valley, e San Francisco Bay Area, South Coast Ranges, n Western Transverse Ranges.