spineless horsebrush, more...
[Tetradymia canescens var. inermis (Rydb.) Payson]
Shrubs, 10-80 cm. Stems 1-5+, erect, unarmed, pannose but for floccose or glabrescent streaks. Leaves: primaries lanceolate to spatulate, 5-40 (× 2-6) mm, tomentose to sericeous; secondaries similar, smaller. Heads 3-8. Peduncles 5-25 mm. Involucres turbinate to cylindric, 6-12 mm. Phyllaries 4, oblong to lanceolate. Florets 4; corollas cream to bright yellow, 7-15 mm. Cypselae 3-5 mm, glabrous or hirsute; pappi of 100-150 bristles 6-11 mm. 2n = 60, 62, 90, 120. Flowering spring-fall. Sagebrush scrub, pinyon-juniper woodlands, yellow-pine forests; 400-3300 m; B.C.; Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.
Plant: shrub, 1-8 dm, unarmed; stems unevenly tomentose, becoming ± glabrous in stripes below nodes Leaves: alternate and generally clustered in axils; main leaves < 4 cm, ± (ob)lanceolate, sparsely tomentose to silvery; clustered leaves like (generally <) main leaves INFLORESCENCE: primary inflorescence a head, each resembling a flower; heads discoid, generally 3-6 in flat-topped clusters; peduncles 5-15(25) mm, bracts 0; involucre 6-8(12) mm, cylindric to obconic; phyllaries 4, oblong to ovate; receptacle naked Flowers: 4; corollas 7-15 mm, creamy to bright yellow, lobes long, spreading; anther bases ± sagittate, tips obtuse or acute; style branches papillate to short-bristly, tips truncate to conic Fruit: achenes, 2.5-5 mm, glabrous or short-stiff-hairy, obconic or fusiform, often angled; pappus of many fine bristles, 6-11 mm Misc: Sagebrush scrub, pinyon/juniper woodland, forest; (400)1600-3300 m.; Jul-Aug
Common Name: spineless horsebrush Duration: Perennial Nativity: Native Lifeform: Shrub General: Shrub, 0.2-0.8 m (0.7-2.6 ft) tall; stems solitary to few, erect, unarmed, much-branched, branches and twigs covered with a dense, felt-like tomentum, interspersed with somewhat glabrous streaks. Leaves: Cauline, alternate, simple, usually with clusters of secondary leaves in the axils of the primary ones, primary blades linear, lanceolate, or oblanceolate, 0.5-4 cm long, 2-6 mm wide, secondary blades smaller, surfaces tomentose to silky pubescent, margins entire, apex sometimes tipped with a minute spine; blades sessile or nearly so. Flowers: Heads 3-8, arranged in cyme-like clusters; involucre top- shaped to cylindric, 6-10 mm long; involucral bracts 4, oblong to lanceolate, tomentose; disk flowers only, 4, cream to bright yellow. Fruits: Achene, 3-5 mm long, glabrous or densely silky pubescent; pappus of numerous white to tan hair-like bristles. Ecology: Found in dry, open habitats, plains, foothills, mountains from 5,000-10,500 ft (1524-3200 m), flowers July-October. Distribution: Apache, Coconino, Mohave, Navajo, and Pima counties; western Canada, western and southwestern U.S. Notes: A highly drought-tolerant plant, Tetradymia canescens is also fire-adapted; although top-killed by fire, it sprouts from the root crown and also produces a prolific seed crop. It is toxic to sheep. Ethnobotany: The Hopi use a decoction of the leaf and root to shrink the uterus and stop discharge after birth. The Navajo use the plant as a ceremonial emetic and as a cold remedy, and also make a yellow dye from the flowers. Editor: Springer et al. 2011