|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
previous taxon |
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 generally not overtopping main stem, soft-hairy and glandular below, canescent or short-bristly above, resinous
Leaves: lower 615 cm, linear, bristly, resinous; upper crowded
Inflorescence spike- or raceme-like; heads sessile or short-peduncled; peduncle bracts 25 mm, overlapping, appressed to involucre base, spreading to ± recurved, ± cylindric, generally gland-tipped; involucres 56 mm, ± obconic; phyllaries with 520 stout, gland-tipped projections, otherwise glabrous; receptacle 12 mm diam, nearly flat
Ray flowers 37; ligules 46 mm
Disk flowers 925; corollas 3.54.5 mm; anthers black
Fruit: ray achenes 2.43.5 mm
Elevation: < 800 m.
Bioregional distribution: Inner North Coast Ranges, n&c Sierra Nevada Foothills, Great Central Valley, e Central Western California, c&s South Coast.