Daleae Imagines page 855 plate CXXXI
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Title
Daleae Imagines page 855 plate CXXXI
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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 CXXXI Dalea humilis G. Don and D. reclinata (Cav.) Willd. are obligately annual and alike in the pubescence of fine, spirally twisted hairs, well-developed stipules, relatively few pairs of membranous leaflets, and small flowers with dorsally recessed calyx- tube and a banner as long or longer than the keel. Both are variable in vigor, stature (but stems rarely over 4 dm long), and size of the calyx and petals. The spikes of the usually diffuse D. humilis are at least partly leaf-opposed, the leaflets are few (mostly 2 or 3 pairs), and the hairs on the back of the bracts are filiform. The petals vary from whitish through pale pink or brownish pink to purple. A common and locally abundant weed of fields and roadsides, mostly below 2000 m, throughout the Transverse Volcanic Belt of Mexico from Nayarit to Puebla and Hidalgo, it extends s.-e. into centr. Oaxaca, and n.-w., becoming rarer, along the w. edge of the Meseta Central into centr. Durango. The spikes of D. reclinata are terminal to the erect main stem or to incurved-ascending lateral ones, the leaflets are more numerous (4-5 pairs in at least some leaves) and commonly broader, and the hairs on the back of the bracts are minutely bulbous-based. The petals vary from pinkish to dull purplish-blue. The range of D. reclinata lies almost entirely within that of D. humilis, but is not only more restricted spatially and altitudinally but highly discontinuous. The species is common in temperate grassland and pine-forest, mostly between 2000 and 2700 m, in the Valley of Mexico, extending just into Morelos and Hidalgo, and w. through the mountains into n.-centr. Michoacan. It reappears disjunctly and uncommonly on the e. slope of Sierra Madre Occidental between centr. Durango and s. Chihuahua. — Habit × 1; the rest × 5. D. humilis: 1) part of stem, robust phase; 2) stem, depauperate phase; 3) stipules; 4) raceme-axis; 5) flowers + bracts; 6) banners; 7) wings; 8) keels; 9) androecia; 10) fruiting calyx and pod. D. reclinata: 1) part of stem; 2) stipules; 3) bract; 4) flower + bract; 5) calyx, laid open; 6) banner, ventral and profile views; 7) wing; 8) keel; 9) androecium; 10) fruiting calyx; 11) pod.
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Taxonomy
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Copyright Statement
Copyright The New York Botanical Garden Press
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Image Type