Shrubs [trees] or vines. Stems ± erect; twigs multicellular stipitate-glandular-hairy and, sometimes, conspicuously strigose (hairs elongate, stiff, long-celled, eglandular), otherwise sparsely to densely unicellular-hairy. Leaves persistent or deciduous, alternate, sometimes pseudoverticillate [in whorls of 3]; blade ovate, elliptic, or slightly obovate, coriaceous, margins obscurely to clearly toothed or serrulate [entire], plane or revolute, surfaces multicellular, short-stalked stipitate-glandular-hairy (along with, in P. floribunda, stout, elongate hairs associated with marginal teeth, and unicellular-hairy on midvein adaxially); venation brochidodromous to reticulodromous (veins of varied thickness and conspicuousness). Inflorescences axillary or terminal panicles or racemes, 15-35-flowered, (borne the year preceding flowering). Pedicels: bracteoles 2, proximal or distal. Flowers: sepals 5, slightly connate, ovate [oblong-lanceolate]; petals 5, connate for nearly their entire lengths, white, corolla urceolate to cylindric-urceolate, lobes short; stamens 10, included; filaments straight or geniculate, glabrous or hairy, with 2 stout, minutely papillose spurs at anther-filament junction; anthers without awns, dehiscent by elliptic pores; pistil 5-carpellate; ovary 5-locular; stigma capitate. Fruits capsular, subglobose or globose to ovoid, (with unthickened sutures), dry. Seeds 40-100, ellipsoidal to obovoid, ± rectangular or angular-ovoid, or narrowly conic, flattened or not, (sometimes slightly winged); testa cells elongate or isodiametric. x = 12.
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Shrubs or trees, evergreen [or woody vines in E North America]. Leaves spirally arranged or pseudoverticillate [or in whorls of 3 in NE Asia], petiolate; leaf blade leathery, margin entire to strongly toothed. Inflorescences terminal or axillary, paniculate or racemose. Pedicels ± pubescent and with glandular hairs. Flowers 5-merous. Calyx valvate, abaxially glandular, adaxially pubescent. Corolla white, urceolate to tubular-urceolate, shortly 5-lobed. Stamens included; filaments swollen at base, straight or geniculate; anthers on back with a pair of spurs at anther-filament junction, dehiscing by introrse-terminal and elliptic pores. Ovary superior, with many ovules per locule. Stigma truncate. Capsule loculicidal, with 5 unthickened sutures. Seeds small.
Fls 5-merous, cal persistent, campanulate, the sep leathery, valvate at base; cor ovoid, much-constricted above, 5-saccate at base alternately with the sep, sharply 5-angled in bud; stamens included, much shorter than the cor; filaments flat, sometimes geniculate, glabrous; anthers oblong, opening by 2 terminal pores, bearing 2 short, outwardly deflexed spurs; ovary 5-lobed; style columnar; stigma truncate; capsule globose, not retuse, not thickened at the sutures; seeds few in each locule, narrowly oblong, finely cellular-reticulate; shrubs with alternate, evergreen lvs and white fls in terminal panicles. 10, N. Amer., e. Asia.
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