Petrophytum cinerascens |
Rosaceae tribe Spiraeeae |
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Chelan rockmat |
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Habit | Prostrate, matted sub-shrub. | |
Leaves | Leaves oblanceolate-spatulate, 15-25 mm. long and 2-4 mm. broad, 3-nerved, sparsely appressed-pubescent. |
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Flowers | Inflorescence a tight, spikelike, bracteate raceme 2-6 cm. long on a peduncle 5-15 cm. tall, with scattered, bract-like leaves below and more numerous linear, acute bracts above bearing rudimentary buds; pedicles 0.5-2 mm. long; calyx grayish-sericeous, top-shaped, 1 mm. long, with 5 triangular-lanceolate, erect lobes 1.5 mm. long; petals narrowly oblanceolate with a wedge-shaped base, scarcely exceeding the sepals; stamens 20-25; pistils 5, the styles slender, 2 mm. long. |
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Fruits | Follicles nearly 3 mm. long. |
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Petrophytum cinerascens |
Rosaceae tribe Spiraeeae |
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Flowering time | June-August | |
Habitat | Basaltic cliffs. | |
Distribution | Occurring east of the Cascades crest, where endemic to the Columbia River region of central Washington.
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Origin | Native | |
Conservation status | Endangered in Washington (WANHP) | |
Sibling taxa | ||
Web links |