Petrophytum hendersonii |
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Olympic Mountain rockmat |
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Habit | Shrubs, 2–9 dm diam. |
Stems | decumbent to ascending, 1–10 cm, internodes 0.5–1.5 cm. |
Leaves | blade narrowly obtrullate, sometimes oblanceolate to spatulate-obovate, 1–2(–3) × 0.2–0.6 cm, palmately 3-veined, venation visible through hairs, apex acute, abaxial surface sparsely strigose, pilose to pilose-sericeous, sometimes glabrate, sparsely strigose along veins. |
Panicles | densely racemose, 2–5 × 1–2 cm, sparsely sericeous; bracts linear, 2–4(–6) mm, pilose. |
Pedicels | 2–5 mm; bracteoles 1, rarely extending to base of sepals. |
Flowers | 3–5 mm diam.; hypanthium 0.5–1 mm, sparsely pilose; sepals reflexed, oblong to obtuse, 1–1.5 mm, margins ciliate, abaxial surface sparsely pilose; petals oval, oblong, or obovate, 2–2.5 mm, apex obtuse, sometimes 2-lobate; stamens 25–40, lengths 1–1.3 times petals (2 times sepals); carpels (4–)5(–6), abaxially connate. |
Follicles | 1.5–2 mm. |
2n | = 18. |
Petrophytum hendersonii |
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Phenology | Flowering Jul–Sep. |
Habitat | Rock outcrops, cliffs, talus slopes |
Elevation | 1000–2300 m (3300–7500 ft) |
Distribution |
WA
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Discussion | Petrophytum hendersonii is known only from the Olympic Mountains of northwestern Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 412. |
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Spiraeeae > Petrophytum |
Sibling taxa | |
Synonyms | Eriogynia hendersonii, Luetkea hendersonii, Spiraea hendersonii |
Name authority | (Canby) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 253. (1908) |
Web links |