Daleae Imagines page 679 plate XLIII

  • Title

    Daleae Imagines page 679 plate XLIII

  • Creator(s)

    R. C. Barneby

  • Publisher

    The New York Botanical Garden Press

  • Description

    PLATE XLIII Dalea dipsacea Barneby and D. obreniformis (Rydb.) Barneby are annual, Mexican, glabrous or nearly so below the spikes; both have stiff, ribbed stems about 1.56 dm tall, green foliage paler beneath, and dense spikes of tiny, fugacious flowers. Other common characters are free keel-petals perched close up to the point of separation of the filaments, an androecium reduced to 7, 6, or 5 members, and anthers exposed although not exserted at anthesis. The flower of D. dipsacea is bicolored, the white banner contrasting with violet-blue wings and keel; that of D. obreniformis is all vivid blue. Both species are found in the Neovolcanic Belt, mostly in oak-pine woodland, flowering in late summer and fall. The rare D. dipsacea is apparently endemic there, but is known from only two stations, one in central Michoacan, one in Nayarit. The range of D. obreniformis is bicentric. It is common in the sector of the Neovolcanic Belt lying between Sierra Tepoztlan, Morelos, and Volcan Tancitaro, Michoacan; and reappears in the distant Sierra Madre Occidental in southwestern Chihuahua. Note the long-tailed bracts of D. dipsacea and the obcordate ones of D. obreniformis; each provides a striking diagnostic feature. Inflorescences × 1; stipules and leaflets × 5; the rest × 10. D. dipsacea: 1) top of flowering stem; 2) stipules; 3) leaflets; 4) bract, dorsal view; 5) flower + bract; 6) tip of androecium + inner petals; 7) banner, ventral view; 8) inner petals; 9) androecium. D. obreniformis: 1) top of flowering stem; 2) stipules; 3) leaflets; 4) lowermost bract, profile; 5) upper bracts, profile and vertical views; 6) flower + bract; 7) banner, ventral view; 8) wing; 9) keel-petal; 10) androecium; 11) fruiting calyx; 12) pod.

  • Taxonomy

    Dalea dipsacea Barneby

    Dalea obreniformis (Rydb.) Barneby

  • Copyright Statement

    Copyright The New York Botanical Garden Press

  • License Statement

    Image may not be reproduced without the permission of The New York Botanical Garden Press

  • Cite This Image

    Image may not be reproduced without the permission of The New York Botanical Garden Press

  • Image Type

    Illustration