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Jepson Interchange (more information)
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ASTERACEAE

SUNFLOWER FAMILY

David J. Keil, Family Editor and author, except as specified

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.

MADIA

TARWEED

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

M. stebbinsii T.W. Nelson & J.P. Nelson

STEBBINS' MADIA

Annual 5–25 cm
Stems branched near base and above, sparsely bristly; upper branches minutely stalked-glandular; glands black
Leaves 1–2.2 cm, mostly crowded at stem bases and branches, bristly; margins inrolled
Inflorescence: heads in open cymes; involucre 4.5–5.5 mm, ovoid; phyllaries linear, acuminate, long-soft-hairy, black-glandular, tips purple; chaff scales ± free
Ray flowers 4–6; corolla tubes ± 1.5 mm, ligules 4–5 mm, bright yellow
Disk flowers 8–20; outer fertile; inner sterile; corollas ± 3.5 mm; anthers yellow
Fruit: ray achenes 2–3.5 mm, club-shaped, slightly curved, beak 0, pappus 0.5–1 mm, scales plumose; disk achenes 2–4 mm, slightly club-shaped, base expanded, glabrous, pappus scales 8–10, 1.2–3.5 mm, slender, plumose
Chromosomes: 2n=18
Ecology: Serpentine soils
Elevation: 1100–1400 m.
Bioregional distribution: s Klamath Ranges, Inner North Coast Ranges (Trinity and Tehama cos.)
Recent taxonomic note: *Harmonia stebbinsii (T.W. Nelson & J.P. Nelson) B.G. Baldwin

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bioregional map for MADIA%20stebbinsii being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Madia stebbinsii
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