Daleae Imagines page 601 plate IV

  • Title

    Daleae Imagines page 601 plate IV

  • Creator(s)

    R. C. Barneby

  • Publisher

    The New York Botanical Garden Press

  • Description

    PLATE IV Psorothamnus schottii (Torr.) Barneby, Ps. fremontii (Torr.) Barneby with leaves of var. attenuatus Barneby, and Ps. arborescens (Torr.) Barneby with vars. arborescens, simplifolius (Parish) Barneby, pubescens (Parish) Barneby, and minutifolius (Parish) Barneby comprise the sect. Xylodalea, a group of closely inter-related thorny shrubs with showy indigo-blue or vivid purple flowers giving rise to large exserted pods enclosing a massive seed. Collectively they are dispersed over the whole Mohave and Colorado deserts in California and adjoining Nevada and Arizona, Ps. schottii extending south into Baja California and the other two northeast into the canyonlands of southern Utah and northern Arizona. Notable features of the group are instability of vesture and polymorphism of the foliage, the leaflets varying from green and glabrate to gray-tomentulose or silvery and from short-petiolulate to sessile and confluent. Note the short-toothed calyx combined with simple or partly trefoil leaves of Ps. schottii; the densely glandular pod of Ps. fremontii; and the different leaf-types of Ps. arborescens sens. lat. Flowering branchlets and detached leaves × 1; the rest × 2. Ps. schottii: 1) flowering branchlet; 2) a trifoliolate leaf; 3) flower; 4) calyx (pubescent variant); 5) pod. Ps. fremontii var fremontii: 1) flowering branchlet; 2) calyces; 3) leaves; 4) banner (ventral view); 5) wing; 6) keel; 7) pod; var. attenuatus: 8) leaves. Ps. arborescens var. arborescens: 1) calyces, pubescent and glabrate; 2) leaves; var. simplifolius: 3) flowering branchlet; 4) sterile branchlet with reduced foliage; 5) flower + bract; 6) banner (ventral view); 7) pod; var. pubescens: 8) leaf, calyces, and pod; var. minutifolius: 9) flowering branchlet; 10) leaflets; 11) flower; 12) banner (profile view); 13) keel; 14) androecium.

  • Taxonomy

    Psorothamnus schottii (Torr.) Barneby

    Psorothamnus fremontii (Torr. ex A.Gray) Barneby

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  • Image Type

    Illustration