Daleae Imagines page 687 plate XLVII
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Title
Daleae Imagines page 687 plate XLVII
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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 XLVII Dalea polygonoides Gray and D. thouini Schrank are obligately annual, glabrous below the spikes of flower, and may consist either of a single erect stem or of several incurved-ascending from near the ground. The leaflets of both are green above, paler beneath, the petals of the small vexillate flowers dull rose or purplish. Both are plants primarily of the oak and pine belts, where they reach maturity during the late summer and fall. The range of D. polygonoides extends over much of montane Arizona southward from the Flagstaff Plateau, east through the Mogollon Mountains to isolated stations in central New Mexico and the Davis Mountains in trans-Pecos Texas, and south interruptedly along Sierra Madre to central Durango. Note the solitary gland (sometimes 2) in each interval of the calyx, and the androecium reduced to 6-9 filaments of which only four or five bear fertile anthers. The range of D. thouini is (or now appears) bicentric. The species is locally common along the crest of the Neovolcanic Belt lying between the Nevado de Toluca and Popocatepetl, extending on the southern slope in Morelos down into the scrub zone as low as 1680 m; and disjunctly in pine-fir forest near the crest of Sierra Madre Occidental in central Durango, where D. polygonoides finds its southern limit. Features of D. thouini worth particular notice are the livid, almost black bracts shaggy internally with silver hairs, the gland- dotted petals, and shortly exserted anthers. Habit × 1; stipules and leaf-rachis × 5; the rest × 10. D. polygonoides: 1) habit; 2) part of leaf-rachis + pedicels; 3) bracts, dorsal view; 4) flower; 5) banner; 6) wing; 7) keel; 8) androecium; 9) fruiting calyx (of the form with glabrous calyx-tube); 10) pod. D. thouini: 1) habit; 2) stipules; 3) leaflets; 4) outer bract, ventral view; 5) inner bract, dorsal view; 6) flower; 7) banner, ventral view; 8) keel; 9) androecium + inner petals; 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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License Statement
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Cite This Image
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Image Type