|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 < 30 cm, monoecious, ± glabrous
Stem branched, erect
Leaves cauline, alternate, < 15 cm, entire or lobed
Inflorescence: heads radiate, borne in cymes; phyllaries in 1 series, thin, margins clear; receptacle flat, naked
Ray flowers 613, pistillate, (pistillate flowers without corollas sometimes also present); ligules ± yellow (or 0)
Disk flowers 2100, staminate; corolla yellow; anthers obcordate, pollen yellow or white; style undivided, tip head-like
Fruit 24.5 mm, obovoid, generally papillate (if so, gray, sticky when wet); pappus 0
Species in genus: 3 species: CA & Chile
Etymology: (Greek: slimy seed)
Reference: [Ornduff 1964 Brittonia 16:289295]
Leaves 0.56 cm, linear, pinnately lobed; lobes 315, short, linear
Inflorescence: involucre 56 mm
Ray flowers: ligules 37 mm, yellow or rarely white, ± purple on back; stigma yellow; pistillate flowers without corollas present
Disk flowers: stigmas and pollen white or yellow
Fruit 2.54.5 mm, smooth or ridged
Ecology: Grassland, scrub, woods, generally wet, open areas
Elevation: < 1600 m.
Bioregional distribution: North Coast, North Coast Ranges, Sierra Nevada Foothills, Great Central Valley, Central Western California, South Coast, Channel Islands.
Disk flowers 60100; pollen yellow
Fruit 34.5 mm, ridged, generally papillate
Ecology: Grassy places in shrubs
Elevation: < 100 m.
Bioregional distribution: c North Coast (Fort Bragg, Mendocino Co.), n Central Coast (Point Reyes peninsula, Marin Co.).Fls late spring. Some populations on Point Reyes peninsula are intermediate to var. nanum in fruit length, pollen color
Horticultural information: In cultivation.