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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.

ARTEMISIA

SAGEBRUSH

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]

Native

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

Native

subsp. wyomingensis Beetle & A. Young

WYOMING SAGEBRUSH

Plant generally < 4 dm
Leaves generally < 1.2 cm, wedge- to fan-shaped
Inflorescence generally < 6 cm, narrow, often surrounded by vegetative branches; branches short, stiffly spreading, persistent, giving plant a twiggy appearance
Fruit glandular
Chromosomes: 2n=36
Ecology: Uncommon. Valleys, slopes
Elevation: < 2200 m.
Bioregional distribution: Modoc Plateau
Distribution outside California: to Idaho, Wyoming, New Mexico

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bioregional map for ARTEMISIA%20tridentata%20subsp.%20wyomingensis being generated
 


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