|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, 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 112 dm; branches stiffly ascending, overtopping main stem, bristly below, glabrous or puberulent above, resinous
Leaves: lower 615 cm, linear, bristly, resinous; upper well spaced
Inflorescence open, ± flat-topped; peduncle bracts 13 mm, overlapping, ascending to spreading, ± cylindric, generally gland-tipped; involucres 45 mm, ± obconic; phyllaries with 520 stout, gland-tipped projections, glabrous or minutely glandular; receptacle 22.5 mm diam, flat or rounded
Ray flowers 49; ligules 46 mm
Disk flowers 1121; corollas 2.54 mm; anthers yellow
Fruit: ray achenes 2.53.5 mm
Elevation: < 500 m.
Bioregional distribution: s Sierra Nevada Foothills, nw San Joaquin Valley, ne Central Western California.Highly variable; densely leafy, late-flowering plants from nw SnJV, e SnFrB have been called subsp. autumnalis D.D. Keck.