|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 635 cm, glandular, not scentedSee the CNPS Inventory for information about endangerment and rarity.
Leaves 470 mm, linear to (ob)lanceolate, thin; lower leaves generally lobed > 1/2 to midvein
Inflorescence: peduncles < 8 cm; involucre ± narrow elliptic to bell-shaped; phyllaries 512 mm, basal margins interlocked by cottony hairs; chaff scales between ray and disk flowers
Ray flowers 59; ligules 415 mm, yellow
Disk flowers 1067; corollas 58 mm; anthers yellow
Fruit 3.57.5 mm; disk pappus of 1622 bristles, 47 mm, white, densely plumose below, scabrous above, densely woolly on inner surface
Ecology: UNCOMMON. Serpentine or sandy soils
Elevation: 100800 m.
Bioregional distribution: c&s Inner North Coast Ranges, Sacramento Valley (Sutter Buttes)
Horticultural information: SUN: 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.