JOURNAL OF THE ARNOLD ARBORETUM THE GENERA OF STERCULIACEAE IN THE SOUTHEASTERN UNITED STATES 1 GEORGE K. BRIZICKY STERCULIACEAE Bartling, Ord. Nat. Pl. 255, 340. 1830, nom. cons. (STERCULIA FAMILY) Trees, shrubs, or herbs [rarely vines]; pubescence of stellate and/orsimple hairs; inner bark usually fibrous; mucilage cells and/or cavitiesand/or ducts in the axis and/or leaves and reproductive organs. Leavesalternate, usually simple and palmately veined at base, petioled Irarelysessile]; stipules caducous or persistent. Inflorescences bracteate cymesor thyrses, axillary and/or terminal, rarely opposite the leaves, some-times reduced to fascicled or solitary flowers. Flowers bisexual or uni-sexual by abortion, regular, usually hypogynous, pediceled to sessile,usually bracteolate, sometimes with an involucel of 3 or 4 distinctbract(let)s. Sepals usually 5, connate [rarely distinct], often nectarifer-ous at base within, valvate. Petals usually 5, distinct, sometimes adnateat base to the staminal tube, usually clawed, sometimes hooded (with aterminal appendage), convolute, or absent. Stamens 5-15 [-45], usuallyconnate into a staminal tube, often on an androgynophore, sterile in 9flowers, the antipetalous ones 5 (or in 5 fascicles of 2 or 3), fertile, theantisepalous ones 5, usually sterile or wanting, rarely fertile; anthers ex-trorse, usually dorsifixed, 2-or rarely 3-locular, the locules parallel ordivergent [rarely separated, or exceptionally superposed], sometimes ofunequal size, longitudinally dehiscent; pollen usually small to mediumsized, oblate to prolate, often nearly spherical, 3-8-colp(oidor)ate, mostlyreticulate. Gynoecium 5-carpellate [rarely up to 60-carpellate], syn-carpous, rarely apocarpous, or 1-carpellate, rudimentary in $ flowers; 1Prepared for a generic flora of the southeastern United States, a joint project of the Arnold Arboretum and the Gray Herbarium of Harvard University made possible through the support of George R. Cooley and the National Science Foundation and under the direction of Carroll E. Wood, Jr., and Reed C. Rollins. This treatment follows the pattern established in the first paper in the series (Jour. Arnold Arb. 39: 296-346. 1958) and continued through those in volumes 40-46 (1959-1965). The area covered includes North and South Carolina, Georgia, Florida, Tennessee, Ala-bama, Mississippi, Arkansas, and Louisiana. The descriptions are based primarily on the plants of this area, with any supplementary material in brackets. References which the author has not seen are marked by an asterisk. The author is indebted to Dr. Wood for his many editorial suggestions and helpful criticisms in the course of this work; to Dr. R. K. Godfrey for flowering material of Firmiana; and to Mrs. Gordon W. Dillon for her help in the preparation of the type-script.[VOL. 47
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