|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.
Species in genus: 1 sp.: CA
Etymology: (Joseph P. Tracy, nw California botanist, 18791953)
Reference: [Blake 1937 Madroño 4:7377]
Annual < 35 cmSee the CNPS Inventory for information about endangerment and rarity.
Stem generally branched above, erect, glabrous
Leaves alternate, entire, < 2.5 cm, narrowly lanceolate; margins hairy
Inflorescence: heads radiate, terminal; involucre, < 7 mm, cylindric to widely obovoid; phyllaries in 24 series, ± linear, falling separately
Ray flowers < 22 in 1 series; corolla < 5.5 mm, thread-like, inconspicuous, pale or greenish yellow, red-tinged
Disk flowers < 26, < ray flowers, pale or greenish yellow
Fruit < 5.5 mm, cylindric or fusiform, brown; beak short, hairy; pappus of < 40 slender bristles, < 4 mm, many > disk flowers
Ecology: Grassy slopes
Elevation: < 500 m.
Bioregional distribution: North Coast Ranges (Humboldt, Lake cos.).Generally self-pollinated.