Daleae Imagines page 719 plate LXIII
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Title
Daleae Imagines page 719 plate LXIII
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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 LXIII Dalea leucostachya Gray flowers precociously as a weakly suffrutescent herb, but becomes under arid conditions a bush 1-2 m in diameter and in the oak-pine belt of s. Mexico attains the stature of a small tree up to 6 m tall. The foliage varies from green and glabrous to softly and densely gray-tomentulose and the leaflets, which are dotted on both sides, vary from emarginate to shortly acuminate. The flowers, arranged in loose, catkinlike spikes, are pure white with exposed golden-yellow anthers. The species is distributed discontinuously through the Sierras Madre Occidental and Sur from s. Sonora and s.-centr. Chihuahua to Oaxaca, extending inland along the Neovolcanic Belt from Nayarit to the foothills of Nevado de Toluca in s. Mexico, and n. of Rio Grande de Santiago crosses the Sierra crest to the edge of the plateau grasslands. Under arid conditions the plants flower in fall months, but continue through winter southward. The var. leucostachya, found in Jalisco n.-ward, is the more xerophytic, more densely pubescent, and larger-flowered type; the main cauline leaves commonly subtend densely tomentulose short-shoots which develop as the flowers fade. The poorly differentiated var. eysenhardtioides (Hemsl.) Barneby, ranging s. and e. from Jalisco (but apparently disjunct in s.e. Chihuahua) is relatively mesophytic, glabrous, and small-flowered. Its panicle of spikes tends to be less leafy, and there are no tomentulose short-shoots during the winter months. — Inflorescences × 1; leaf-rachis and petiolules × 10; the rest × 5. var. leucostachya: 1) flowering branchlet; 2, 3) flowers + bracts; 4) androecium; 5) fruiting calyx. var. eysenhardtioides: 1) flowering branchlet; 2) stipules; 3) leaf-rachis + petiolules; 4) flower + bract; 5) flower, abaxial view; 6) banner, ventral view; 7) wing; 8) keel; 9) androecium; 10) pod.
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Taxonomy
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Copyright Statement
Copyright The New York Botanical Garden Press
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License Statement
Image may not be reproduced without the permission of The New York Botanical Garden Press
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Cite This Image
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Image Type