|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, 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]
Plant 5100 cm, ± stout, glandular, with acrid or lemon-like odor
Leaves < 11 cm, linear to (ob)lanceolate, thin; lower leaves ± irregularly 12 X lobed
Inflorescence: peduncles < 6 cm; phyllaries 512 mm, basal margins interlocked by hairs; chaff scales between ray and disk flowers
Ray flowers 414; ligules 326 mm, white or yellow
Disk flowers 12125; corollas 36 mm; anthers yellow
Fruit: disk pappus of (0)522 bristles, 1.53.5 mm, fine to flattened, whitish, generally plumose below, generally not woolly on inner surface
Ecology: Light soils
Elevation: < 1800 m.
Bioregional distribution: Sierra Nevada Foothills, n High Sierra Nevada, Tehachapi Mountain Area, San Joaquin Valley, Inner South Coast Ranges.Sspp. hybridize in s SNF. Close to L. glandulosa.
Flower: ligules yellow
Habitats and range of sp. (except Teh, rare in SCoRI).
Bioregional distribution: Sierra Nevada Foothills, n High Sierra Nevada, San Joaquin Valley, rare in Inner South Coast Ranges
Horticultural information: SUN, DRN: 7, 8, 9, 18, 19, 20, 21, 22, 23, 24.