TREATMENT FROM THE JEPSON MANUAL (1993) |
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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, 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, generally ascending to erect, often black-glandular, generally ± purplish or brownish
Leaves alternate, generally linear to (ob)lanceolate, sessile, generally pinnately lobed, reduced upward
Inflorescence: heads generally radiate; involucre obconic to urn-shaped; phyllaries generally folded completely around ray fruit, falling with fruit, generally ± hairy; receptacle flat to slightly convex, chaff scales free, in ring between ray and disk flowers or throughout
Ray flowers (0)327; ligules white (often aging pinkish) to yellow, tubes hairy
Disk flowers 5many; corollas yellow, puberulent; anther tips acute, long-tapered; style branches long, bristly
Fruit generally 25 mm, generally club-shaped, black; ray fruit compressed back to front, generally ± glabrous, pappus 0; disk fruit ± straight, generally ± hairy, pappus various
Species in genus: 14 species: w North America
Etymology: (George T. Lay, early 19th century English plant collector)
Reference: [Kyhos et al. 1990 Ann Missouri Bot Gard 77:8495]
Native |
Plant 860 cm, straw-colored, glandular
Leaves < 5 cm, oblong to oblanceolate, fleshy, ± glaucous, generally scabrous-ciliate; lower leaves ± lobed
Inflorescence: peduncles 112 cm; involucre ± urn-shaped; phyllaries 3.58 mm, basal margins often ± bulged out, interlocked by cottony hairs; chaff scales between ray and disk flowers
Ray flowers 615; ligules 312 mm, white to cream
Disk flowers 20100; corollas 2.55 mm; anthers yellow
Fruit: disk fruit densely white-hairy, pappus of 1013 scales, 23.5 mm, white, ciliate, base sparsely long-hairy
Chromosomes: 2n=14
Ecology: Open slopes in heavy soil
Elevation: 150350 m.
Bioregional distribution: w Tehachapi Mountain Area (Kern Co.).Threatened by development.