Daleae Imagines page 607 plate VII
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Title
Daleae Imagines page 607 plate VII
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Creator(s)
R. C. Barneby
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Publisher
The New York Botanical Garden Press
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Description
PLATE VII Psorothamnus thompsonae (Vail) Welsh & Atwood and Ps. polydenius var. jonesii Barneby (for caption see Plate VI). The prickly shrubs of Ps. thompsonae reach a height of a meter or more and often are as wide as tall, garnished in June with multitudinous racemes of vivid rose-purple flowers. The species occurs locally on dunes and talus derived from sandstones in the canyonlands of the Colorado Plateau, the var. thompsonae, with obovate leaflets, endemic to s.-e. Utah, the var. whitingi (Kearn. & Peeb.) Barneby, with linear-oblanceolate leaflets, vicariant s.-ward into n. Arizona. Remarkable features of Ps. thompsonae are the retrorse pubescence of the stems, which are closely dotted with red blister-glands, and marcescent petals. — Flowering branchlets × 1; the rest × 5. var. thompsonae: 1) branch at anthesis; 2) segment of stem, showing retrorse hairs and prominent glands; 3) leaflets; 4) calyx; 5) banner, ventral view; 6) keel-petals, permanently attached to hypanthium rim; 7) androecium; 8) pod. var. whitingi: 1) flowering branchlet; 2) decurrent leaflet; 3) petiolulate leaflet; 4) calyx. D. polydenius var. jonesii: 1) flowering branchlet; 2) flower + bract; 3) banner, profile view.
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Taxonomy
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Copyright Statement
Copyright The New York Botanical Garden Press
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License Statement
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Image Type