Purshia tridentata |
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Antelope bitterbrush, Antelope bush, Antelope-brush, bitter-brush, blackbrush, buckbrush, deerbrush, greasewood, quinine brush |
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Habit | Shrubs, evergreen or partially summer–winter-deciduous, 2–25(–40) dm. | ||||
Stems | young-stem internodes 4–12 mm, sparsely to densely arachnoid-villous, ± hirtellous, or glabrous, stipitate-glandular or not; short-shoot spurs simple or branched, 5–20(–60) × 1.5–2 mm. |
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Leaves | blade of 1 or 2 types: (1) persistent, dark green adaxially, obovate to spatulate, 4–9 × (1–)3–6 mm, irregularly lobed in distal 1/3, lobes 3(–5), lobes entire, ± terete, central lobe deflexed, often apiculate, 2 lateral ascending, margins strongly revolute, abaxial surface arachnoid-villous, midvein glabrous, glabrate, or hirtellous, adaxial glabrous, sometimes arachnoid-villous or hirtellous, often glandular-punctate along margins; (2) winter deciduous, green-gray adaxially, flabelliform, 6–15+ × 3–7+ mm, margins weakly revolute, usually 3-toothed, sometimes 3-lobed, distally, abaxial surface arachnoid-villous to arachnoid-tomentose, veins ± glabrate, adaxial hirtellous and ± arachnoid villous, sometimes sessile or stipitate-glandular along margins. |
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Pedicels | 0.2–2.5 mm. |
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Flowers | hypanthium obconic, 2.5–5 × 1.5–3 mm, 3.5–6 mm diam. in fruit, pubescent-sericeous, sessile or stipitate-glandular; petals usually lemon- to cream-yellow, sometimes nearly white, obovate-spatulate, 4–7+ mm; stamens 17–35; carpels 1 or 2. |
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Achenes | broadly obovoid-fusiform (circular in cross section or flattened on common side when paired), 7–12 × 3.5–5.2 mm, 15–22-veined, persistent style 5–7(–10) mm, densely hirtellous. |
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Purshia tridentata |
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Distribution |
AZ; CA; CO; ID; MT; NE; NM; NV; OR; UT; WA; WY; BC; nw Mexico
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 340. | ||||
Parent taxa | Rosaceae > subfam. Dryadoideae > tribe Dryadeae > Purshia | ||||
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Subordinate taxa | |||||
Synonyms | Tigarea tridentata | ||||
Name authority | (Pursh) de Candolle: Trans. Linn. Soc. London 12: 158. (1818) | ||||
Web links |