Daleae Imagines page 803 plate CV
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Title
Daleae Imagines page 803 plate CV
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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 CV Dalea hemsleyana (Rose) Bullock and D. polycephala (Rydb.) Bullock are small bushes, rarely a meter tall, with wiry, densely warted stems, condensed green foliage of thick texture, and bicolored flowers, the banner opening creamy but rubescent, the inner petals rose or purple. Both are adapted to long periods of drought, when the larger stem leaves are shed; flowers appear in fall, long after the yearly rains are spent. The more southern species, D. polycephala, ranges at elevations between 2000 and 2800 m from central Puebla and the Valley of Mexico n. across the pumice plains on the west slope of Mt. Orizaba and Cofre de Perote and the desert grasslands of Hidalgo into southeastern San Luis Potosi. The adult foliage is generally glabrous southward but tends to be puberulent toward the northern limit. Note the 2-4 pairs of tiny leaflets, the loose spike, and deciduous bracts. The gland-tipped inner petals are mostly pale pink and relatively small. The rarer and more showy D. hemsleyana is found in elevated steppe at ± 2100-2450 m on the Meseta Central in Zacatecas and s.-w. San Luis Potosi. The foliage is ordinarily glabrous, but the deciduous main cauline leaves subtend late in the season silvery-pubescent buds some of which may develop into short spurs or branchlets. The leaflets are mostly 4-7 pairs, the dense, conelike spikes retain through anthesis an involucel of dorsally glabrous bracts, and the glandless petals are vivid purple. — Flowering branches × 1; the rest × 5. D. hemsleyana: 1) branch; 2) leaf-spur + incipient villosulous spur; 3) leaf (some leaflets removed); 4) outer bracts, dorsal and ventral views; 5) inner bracts; 6) flower; 7) a calyx, laid open; 8) banner, profile and ventral views; 9) wing; 10) keel; 11) androecium. D. polycephala: 1) branch; 2) leaf; 3) bract, profile and ventral views; 4) flower; 5) calyx, laid open; 6) banner, profile and ventral views; 7) wing; 8) keel; 9) androecium.
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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