Daleae Imagines page 715 plate LXI
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Title
Daleae Imagines page 715 plate LXI
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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 LXI Dalea pinnata (J. F. Gmelin) Barneby, tall glabrous herbs widespread in dry sandy habitats over the Atlantic and Gulf Coastal plains of s.-e. United States, with densely but finely leafy, virgate stems branching distally into a corymbose panicle of heads, the small white pentandrous flowers opening in fall and winter. The species is uniquely modified to resemble some eupatorioid Compositae, the spike condensed into a short cone cupped within an involucre composed of enlarged castaneous leaf-bases and bracts of similar texture, while the setiform calyx-teeth function as a pappus, carrying aloft the pod and its single seed in the shape of a little feathered shuttle-cock. Three geographic varieties of D. pinnata are: a northeasterly var. pinnata, extending from centr. peninsular Florida to South Carolina, with pinnate primary leaves, subfiliform leaflets, and small acutish petals; var. trifoliata (Chapman) Barneby, of interior lowland Georgia w. on the Gulf Plain to Mississippi, like var. pinnata except for all leaves trifoliolate and slightly larger petals; and var. adenopoda (Rydberg) Barneby, of centr. and s. peninsular Florida, differing in its broader leaflets, thicker heads, wider and more obtuse petals, and grossly glandular upper stem. — Branchlets and detached cauline leaves × 1; the rest × 5. var. pinnata: 1) a division of the panicle and a primary cauline leaf from mid-stem; 2) leaflets; 3) involucral bracts, a and b outermost, obviously modified leaf-bases, c the first rank subtending a flower and transitional to d, e, and f, the true interfloral bracts, all dorsal view; 4) flower; 5) banner and epistemonous petal; 6) fruiting calyx; 7) pod. var. trifoliata: 8) part of mid-stem, showing primary and fascicled leaves; 9) flower at anthesis; 10) petals. var. adenopoda: 11) a division of the panicle; 12) primary leaf from mid-stem; 13) leaflets; 14) petals; 15) androecium; 16) fruiting calyx.
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Taxonomy
Dalea pinnata (Walter ex J.F.Gmel.) Barneby
Dalea pinnata var. trifoliata (Chapm.) Barneby
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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
Image may not be reproduced without the permission of The New York Botanical Garden Press
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Image Type