Ivesia arizonica |
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purpusia, rock whitefeather |
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Habit | Plants green, ± tufted, often forming hanging clumps, sometimes rosetted. | ||||
Stems | pendent or prostrate to ascending, (0.2–)0.5–1.6(–3) dm. |
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Basal leaves | planar, 2–15(–20) cm; sheathing base usually not strigose abaxially; petiole 3–10 cm; lateral leaflets (2–)3–4(–5) per side, separate, broadly ovate or obovate to orbiculate, (2–)5–15(–18) mm, incised 1/4–3/4 to base into (3–)7–11 ± ovate teeth, apex not setose, surfaces ± sparsely short-pilose, ± glandular; terminal leaflets ± distinct. |
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Cauline leaves | 1–3; blade well developed. |
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Inflorescences | (1–)5–30(–150)-flowered, open, 0.5–14 cm diam. |
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Pedicels | 5–30 mm. |
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Flowers | 6–12 mm diam.; epicalyx bractlets 0(–3), lanceolate, 0.9–1.8 mm; hypanthium turbinate or campanulate, 1.5–3(–5) × 1–3(–4) mm; sepals 2–4(–5) mm, acute; petals yellow or white, oblanceolate to elliptic or obovate, (1.6–)2–4 mm; stamens 5, filaments 0.8–1.3 mm, anthers ± yellow, oblong to narrowly ovate, 0.6–1.5 mm; carpels (2–)6–10(–13), atop a stipelike torus, styles 0.9–1.8 mm. |
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Achenes | greenish white to light tan, 1.2–2 mm, faintly rugose, ± carunculate. |
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Ivesia arizonica |
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Distribution |
AZ; CA; NV; UT |
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Discussion | Varieties 2 (2 in the flora). Because the epithet saxosa was retained for Potentilla saxosa upon transfer to Ivesia, a different epithet (arizonica) was needed when Purpusia was likewise transferred in the same publication (B. Ertter 1989). The correct name for this species in Potentilla is P. osterhoutii (A. Nelson) J. T. Howell, due to the existence of P. arizonica. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 224. | ||||
Parent taxa | |||||
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Synonyms | Purpusia arizonica | ||||
Name authority | (Eastwood ex J. T. Howell) Ertter: Syst. Bot. 14: 233. (1989) | ||||
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