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Kleinodendron and Xylem Anatomy of Cluytieae (Euphorbiaceae)

William L. Stern
American Journal of Botany
Vol. 54, No. 6 (Jul., 1967), pp. 663-676
Stable URL: http://www.jstor.org/stable/2440943
Page Count: 14
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Kleinodendron and Xylem Anatomy of Cluytieae (Euphorbiaceae)
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Abstract

Kleinodendron, a new genus of Euphorbiaceae, was assigned by Smith and Downs to the tribe Cluytieae. A xylem anatomical survey indicates that there are no objections to this placement. Woods of Cluytieae are diverse but may be characterized generally by having pores which average less than 80 μ in diameter and which are well divided between solitary and radial multiple distributions in the same species; simple vessel perforations; alternate intervascular pitting; fibertracheids and libriform wood fibers; exclusively uniseriate, or uniseriate and biseriate heterocellular vascular rays in the same species; uniseriate "bridges" linking superposed biseriate ray segments; diffuse, diffuse-in-aggregates, and scanty vasicentric axial parenchyma, sometimes in the same species; and crystal rhomboids. That Microdesmis and Pogonophora diverge sharply from these generalizations in having scalariform vessel perforations and broad vascular rays, is an indication that they may not be closely related to other genera in Cluytieae.

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