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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Madia stebbinsii
Retrieve dichotomous key for Madia
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Overlay Consortium of California Herbaria specimen data by county on this map
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