Oxydendrum Dc.

Shrubs or trees. Stems erect; twigs glabrous or puberulent. Leaves deciduous; blade elliptic-oblong to elliptic, ovate, or obovate, ± chartaceous, margins irregularly compound-serrate or serrulate, especially distally, or entire (sometimes fringed with elongate hairs, especially when juvenile or on stump sprouts), plane, surfaces multicellular elongate-hairy (hairs stout) on midvein (rarely also secondary veins) abaxially, sometimes such hairs also on midvein and lamina adaxially, or such hairs absent, and ± sparsely unicellular-hairy on both surfaces of midvein or such hairs absent; venation brochidodromous. Inflorescences terminal panicles composed of arching-declinate racemes or secondary panicles, 15-50-flowered, (borne on shoots of current season). Pedicels: bracteoles 2, medial or distal. Flowers: sepals 5, connate slightly to 1/2 their lengths, lanceolate; petals 5, connate ca. 3/4 their lengths, white, corolla urceolate to cylindric-urceolate, lobes much shorter than tube, (densely unicellular-hairy, hairs short to elongate, crisped to straight); stamens 10, slightly exserted; filaments straight, flat, hairy, without spurs; anthers without awns, dehiscent by slitlike pores, with white line of disintegration tissue on each lobe abaxially; pistil 5-carpellate; ovary 5-locular; stigma capitate-truncate. Fruits capsular, ovoid, (with very slightly thickened sutures), dry. Seeds 25-100, narrowly oblong, (tailed); testa cells elongate. x = 12.