Schultesia Mart.

terminal or axillary, few-to many-flowered or 1-flowered by reduction of a simple dichasium, simple or compound dichasia, bracteate. Flowers often large and showy, usually white, pink or lavender; calyx 4-parted, tubular, cupular or urceolate, 4-carinate to 4-winged, the lobes longer or shorter than the tube; corolla infundibular, ? constricted above the ovary, 4-lobed, the lobes usually ovate to triangular, contorted in aestivation; stamens usually 4, included to slightly exserted, the filaments filiform, basally dilated to form a membranous wing, the anthers oblong, erect, usually with an inconspicuous apical mucro; pistil included, ovary 1-locular, the placenta slightly to considerably intruded, the style filiform, deciduous, the stigma bilobate. Capsules septicidally 2-valvate, surrounded by the marcescent calyx and corolla; seeds small, numerous, foveolate. Pollen grains united in a usually tetrahedral tetrad, 44-77 microns; single grains 3-col-porate (3-colpate, 3-porate), the concurrent colpi of two contiguous grains ca. 15 X 13 JL, the ora usually not confluent, the colpus margin and adjacent areas of exine often patternless, the colpus membrane granulose, the diameter of apo-colpia 18-25 microns; exine 2-6 microns thick at the distal poles, decreasing in thickness towards equator; sexine thicker than nexine, reticulate, heterobrochate, the lumina 0.5-7 microns or 0.5-2 microns in diameter, the muri 0.5-1 microns wide; nexine smooth or granulose (S. guianensis, S. heterophylla, S. lisianthoides).