Rhinotropis subspinosa |
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spiny milkwort, spiny or cushion or showy milkwort |
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Habit | Subshrubs or shrubs, multi-stemmed, 0.5–2.5(–6) dm. |
Stems | prostrate to erect, sometimes glaucous, at least when young, glabrous or pubescent, hairs spreading to slightly incurved. |
Leaves | subsessile to petiolate, petiole to 1(–2) mm; blade obovate or elliptic, 4–31 × 0.8–11 mm, base cuneate, apex rounded or acute, surfaces densely to sparsely pubescent or subglabrous, hairs spreading to slightly incurved. |
Racemes | terminal, sometimes reduced to (1 or)2–few flowers, 3–12.5 cm; rachis thorn-tipped; peduncle 0.1–0.5 cm; bracts usually deciduous, rarely persistent, elliptic, ovate, or lanceolate. |
Pedicels | (1.5–)3.5–10(–20.5) mm, glabrous or pubescent. |
Flowers | pink to rose, wings (and other sepals) sometimes light green, distal keel yellow or green, (6–)8–12(–13) mm; sepals deciduous, ovate, elliptic, or lanceolate, 2–7.2 mm, glabrous or pubescent; wings obovate to elliptic-obovate, (5–)7–11.5(–12.2) × (2.3–)3–5.2(–5.9) mm, glabrous or pubescent; keel (5.4–)6.2–10.5 mm, sac glabrous, beak oblong, 1–3 × 0.9–1.5 mm, glabrous. |
Capsules | ellipsoid to obovoid, 4.3–8.8(–10) × 3.7–7.3 mm, base cuneate to rounded, margins with narrow, entire or slightly erose wing, glabrous or pubescent. |
Seeds | 3.3–4.9 mm, ± evenly and moderately densely pubescent, occasionally with glabrate patches; aril 1.2–3.1 mm, lobes to 1/2 length of seed. |
2n | = 18, 36. |
Rhinotropis subspinosa |
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Phenology | Flowering spring–mid summer. |
Habitat | Gravelly soils derived from limestone, shale, lava, or tuff, or crevices of soft calcareous rocks on eroded hills, open slopes and flats, in desert scrub, open pinyon-juniper woodlands, mountain brush, ponderosa pine woodlands. |
Elevation | 1300–2400 m. (4300–7900 ft.) |
Distribution |
AZ; CA; CO; NM; NV; UT
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Source | FNA vol. 10. |
Parent taxa | Polygalaceae > Rhinotropis |
Sibling taxa | |
Synonyms | Polygalasubspinosa s. |
Name authority | (S. Watson) J. R. Abbott: J. Bot. Res. Inst. Texas 5: 135. (2011) |
Web links |
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