UW Burke Herbarium species comparison

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Petrophytum cinerascens

Rosaceae

Chelan rockmat
Habit Prostrate, matted sub-shrub.
Leaves

Leaves oblanceolate-spatulate, 15-25 mm. long and 2-4 mm. broad, 3-nerved, sparsely appressed-pubescent.

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.

Fruits

Follicles nearly 3 mm. long.

Petrophytum cinerascens

Rosaceae
Flowering time June-August
Habitat Basaltic cliffs.
Distribution
Occurring east of the Cascades crest, where endemic to the Columbia River region of central Washington.
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Origin Native Native
Conservation status Endangered in Washington (WANHP) Not of concern
Sibling taxa
P. caespitosum, P. hendersonii
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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