| TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many 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)4–5; stamens 4–5, 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):1–28. See glossary p. 25 for illustrations of general family characteristics.
Annual or perennial herb, generally densely glandular, aromatic
Stems 1–several, 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, few–many; phyllaries generally 1–20, 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 1–20, sometimes minute; ligules 2–3-lobed, generally yellow
Disk flowers 1–many, 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 4–10 scales or bristles
Species in genus: 21 species: w North America, sw South America
Recent taxonomic note: *See revised taxonomy of Baldwin 1999 Novon 9:462–471.
Etymology: (Chilean name)
Reference: [Nelson & Nelson 1980 Brittonia 32:323–325]
| Native |
Annual 2.5–5 dm
Stems generally few-branched throughout; branches ascending, often overtopping main stem, bristly below, soft-hairy, stalked-glandular above
Leaves 4–8 cm, widest at base, finely soft-hairy, sometimes ± bristly; upper glandular
Inflorescence: heads in raceme- or panicle-like clusters; involucre 6–8 mm, obovoid; phyllaries ± bristly, densely stalked-glandular, margins ciliate, tips flat; chaff scales fused > 1/2 length
Ray flowers 5(–14); corolla tubes ± 1.5 mm, ligules 5–8 mm, pale yellow
Disk flowers 3–10(30), fertile; corollas 2.5–3 mm; anthers black
Fruits alike, ± 4 mm, glabrous, moderately compressed side-to-side, black or dark brown; beak ± 0; pappus 0
Chromosomes: 2n=48
Ecology: Open areas, scrub, forests
Elevation: 1400–2000 m.
Bioregional distribution: e High Cascade Range, n High Sierra Nevada (n Plumas Co.), Modoc Plateau.Polyploid derivative of M. citriodora X M. gracilis.