Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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



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.



Leila M. Shultz

Annual to shrubs, generally aromatic
Leaves entire to ± lobed, glabrous to densely hairy; hairs glandular (resin-filled) or T-shaped, hollow
Inflorescence: generally panicle; heads generally discoid or disciform, in racemes or panicles; involucre ovoid to hemispheric, generally concealing flowers; phyllaries in several series, margins scarious; receptacle conic, generally naked
Pistillate flowers 0–many; corollas generally < 2 mm
Disk flowers 4–many, generally forming fruits, sometimes staminate; corollas < 2 mm, pale yellow; anther tips acute to awl-shaped; style branches flat, fringed or blunt (sometimes simple, tack-shaped in staminate flowers)
Fruit < 2 mm, obovoid or fusiform, ribbed or smooth, glabrous, hairy, or resinous; pappus generally 0 or minute crown
Species in genus: ± 300 species: especially n hemisphere
Etymology: (Greek: Artemis, goddess of the hunt, and noted herbalist, Queen of Anatolia)
Reference: [Keck 1946 Proc Calif Acad Sci (4)25:421–468; Shultz 1983 PhD thesis Claremont Graduate School]


A. tridentata Nutt.

Shrub < 30 dm, from thick trunk, gray-hairy
Stems generally glabrous
Leaves 1–3(6) cm, generally wedge-shaped, generally 3(0–5)-toothed at tip, often in axillary clusters, persistent, gray-green, densely hairy
Inflorescence: heads 2–2.5 mm diam, generally erect; phyllaries oblanceolate to widely obovate, densely tomentose, margins ± transparent
Pistillate flowers 0
Disk flowers 4–6
Fruit 1–2 mm, glandular or hairy
Chromosomes: 2n=18,36
Ecology: Common. Dry soils, valleys, slopes
Elevation: 300–3000+ m.
Bioregional distribution: High Cascade Range, High Sierra Nevada, Inner South Coast Ranges, s San Joaquin Valley, South Coast, Transverse Ranges, Great Basin Floristic Province, Mojave Desert
Distribution outside California: to Washington, north-central US, New Mexico

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