Piptadenia

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Standard Cyclopedia of Horticulture

Piptadenia (Greek, falling gland; meaning obscure). Leguminosae. About 45 species of shrubs or trees, mostly native to S. and Cent. Amer., a few in the tropics of the Old World, similar to Mimosa and Acacia: lvs. bipinnate with numerous small lfts., rarely with few and large lfts. : fls. small, white, in axillary globose heads or cylindric spikes; petals small, equal, connate to the middle; stamens 10, free: pod broadly linear, 2-valved, not septate within and not pulpous. The following species has been intro. to Calif, by Franceschi chiefly for its economic interest; in its native country it is valued for tan bark. Prop, by seeds. P. Cebil, Griseb. (P. macrocarpa var. Cebil, Chodat & Hassler). Tree, to 60 ft., glabrous: lvs. with 10-16 pairs of opposite pinnae, each with 24—40 pairs of linear- oblong acutish lfts. about 1/6 in. long; petiole about 1 in. long with a conspicuous gland near the middle: fl.- heads globose, axillary, 1—4, 1/2 in. across, on slender pedicels 3/4-l in. long; stamens long-exserted: pod 6-8 in. long, about 3/4 sin, wide, sinuate between the seeds. Argentina. The following three species have been recently intro. by the Dept. of Agrie.: P. communis, Benth. (Acacia gonoacantha, Mart.). Prickly tree or shrub sometimes sarmentose: branchlete puberulous, angled, older branches sometimes developing corky wings; prickles email: lvs. with 5-12 pairs of pinnae, each with many oblique, falcate, linear lfts.: fl.-spikes 2-3 in. long, solitary or 2-3 in the axils or sometimes crowded at the end of the branches; ovary glabrous: pod linear, 3-4 in. long, reticulate, with scarcely thickened margin. Brazil. Fl. Brasil. 15, 2:74.— P. macrocarpa, Benth. (Acacia grata, Willd.). Unarmed tree: branchlets and petioles grayish tomentulose: lvs. about 6 in. long, with 10-25 pairs of pinnae, each with many oblique linear lfts. scarcely 1 line long: fl.-heads peduncled, globose, many-fld., 2-4, axillary, sometimes crowded at the end of the branchfets: pod 4-10 in. fong, 3/4 -1 in. bread, with thickened margin. Brazil, Bolivia.—P. rigida. Benth. (Acacia Angico, Mart.). Unarmed tree or shrub, nearly glabrous: lvs. with 3-6 pairs of pinnae. each with many oblique linear, falcate, lustrous lfta. about 1/3 in. long: a.-spikes axillary, 1-1 1/2 in. long; ovary glabrous: pod linear, to 5 in. long, with slightly thickened margin. Brazil. It furnishes the Angico gum similar to gum Arabic; the bark is rich in tannin. Other species, known as acacias, are likely to appear in cult. P. chrysostachys, Benth. (Acacia chrysostachys, Sweet). Unarmed tree, puberulous: pinnae 3-6 pairs; lfts. 8-15 pairs, oblong, obtuse, nearly 1/3 in. long: spikes solitary or 2, dense, 3 in. long: calyx and corolla grayish pubescent. Madagascar. The wood is used by the natives for musical instruments.—P. latifolia, Benth. (Acacia fruticosa. Mart.). To 4 ft. high: lvs. bipinnate, glabrous, with 2 or 3 pbovate-elliptic lfts.: fl.-spikes axillary, or terminal panicles. Brazil.—P. peregrina, Benth. The Acacia microphylla, Willd., is referred here. It is unarmed: pinnae 25 pairs; lfts. 5O-60 pairs, linear, acute, ciliate; large gland at base of petiole: branches and petioles pubescent: heads pedunculate, twin, in the axils: pod linear, 9 in. long. Brazil to Trinidad. ALFRED REHDER. CH The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

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