|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 or perennial herb, generally densely glandular, aromatic
Stems 1several, generally simple below, ± branched above
Leaves generally opposite below, alternate above, generally linear to lanceolate, entire to slightly toothed
Inflorescence: heads generally radiate, generally peduncled, fewmany; phyllaries generally 120, free, enclosing (and falling with) ray achenes; receptacle ± flat, generally glabrous; chaff scales generally ± fused, in ring between ray and disk flowers
Ray flowers generally 120, sometimes minute; ligules 23-lobed, generally yellow
Disk flowers 1many, sometimes staminate; corollas yellow or maroon; anther tips triangular-ovate; style tips linear to oblong, acute, bristly
Fruit club-shaped or obovoid; ray achenes compressed, thickened, or 3-angled (1 angle toward center of head), ridged, sometimes beaked; pappus 0 or of short scales; disk achenes ± symmetric; pappus 0 or of 410 scales or bristles
Species in genus: 21 species: w North America, sw South America
Recent taxonomic note: *See revised taxonomy of Baldwin 1999 Novon 9:462471.
Etymology: (Chilean name)
Reference: [Nelson & Nelson 1980 Brittonia 32:323325]
Annual 25 dm
Stems bristly below; upper branches puberulent, ± loosely bristly, glandular; glands golden to brown
Leaves 37 cm, soft-spreading- to appressed-hairy, ± glandular above
Inflorescence: heads fewmany, in ± open flat-topped to rounded clusters; peduncles generally 13 cm, bracted; involucre 67 mm, spheric; phyllaries acute, stalked-glandular, sticky-puberulent, tips flat; chaff scales fused only near base
Ray flowers 37; corolla tubes 22.5 mm, ligules 33.5 mm
Disk flowers 36, fertile; corollas 3.54 mm; anthers black
Fruits alike, 34 mm, obovoid, not flat, glabrous, black, shiny; beak 0; pappus 0
Ecology: Grassy slopes
Elevation: < 500 m.
Bioregional distribution: North Coast Ranges, s Sacramento Valley, San Francisco Bay Area.Interfertile with M. gracilis.