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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

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.

OSMADENIA

Robert L. Carr and Gerald D. Carr


Species in genus: 1 sp
Etymology: (Greek: odor gland)

Native

O. tenella Nutt.

OSMADENIA

Annual < 4 dm, ± densely glandular, ± scabrous and long-hairy, strongly scented; tack- or saucer-shaped glands 0
Stem erect; branchlets many, thread-like, ± spreading
Leaves alternate, sessile, reduced upward; lower 2–5 cm, linear, entire
Inflorescence: heads many, radiate, in cymes; peduncles spreading, bracts few, 5–8 mm, narrowly lanceolate; phyllaries 4–7 mm, partly enfolding ray fruit; chaff scales between ray and disk flowers, 4–7 mm, fused
Ray flowers 3–5; ligules deeply 3-lobed, white to reddish, sometimes red-spotted near base
Disk flowers 3–10; corolla colored like ligule; anthers yellow
Fruit: ray fruit 1.8–2.7 mm, back rounded to angled, rough, glabrous, inner surface ± flat, beak short, off-center, pappus 0; disk fruit ± angled, tapered at base, ± thinly hairy, pappus of ± 8 scales, long and short
Chromosomes: 2n=18
Ecology: UNCOMMON. Barren, often rocky, exposed hillsides, canyons
Elevation: < 600 m.
Bioregional distribution: Southwestern California (except Channel Islands)
Distribution outside California: Baja California
Synonyms: Calycadenia t. (Nutt.) Torr. & A. Gray

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