| TREATMENT FROM THE JEPSON MANUAL (1993) |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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, 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.
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 3–16; ligules 3-lobed (middle narrowest), yellow
Disk flowers few–many, 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.
| Native |
Stems 2–12 dm; branches glandular throughout, hairy below, densely gray-puberulent above
Leaves canescent; lower 3–10 cm; upper densely glandular
Inflorescence raceme- to panicle-like; peduncle bracts 2–5 mm, overlapping, appressed to ± recurved, flat, gland-tipped; involucres 5–6 mm, ± hemispheric; phyllaries with 25–50 very slender gland-tipped projections, puberulent, sticky; receptacle 1–2 mm diam, rounded
Ray flowers 3–10; ligules 5–6.5 mm
Disk flowers 9–22; corollas 3.5–5 mm; anthers yellow
Fruit: ray achenes 2.5–4 mm
Chromosomes: 2n=12
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.