Flora of North America species comparison

± erect;

twigs multicellular stipitate-glandular-hairy and, sometimes, conspicuously strigose (hairs elongate, stiff, long-celled, eglandular), otherwise sparsely to densely unicellular-hairy.

± terete.

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).

blades ovate, elliptic, or slightly obovate, (1–)2–6(–7) × (0.3–)0.3–2(–2.7) cm, base narrowly cuneate to rounded, margins obscurely to clearly toothed, especially near apex, revolute, apex acute to rounded.

axillary or terminal panicles or racemes, 15–35-flowered, (borne the year preceding flowering).

axillary racemes, from near stem apex;

bracteoles near apex to middle of pedicel.

bracteoles 2, proximal or distal.

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.

calyx lobes 3.5–5 × 1–1.5 mm;

corolla cylindric-urceolate, weakly 5-ridged, 6–8(–8.5) × 4–5 mm;

filaments geniculate, 4–6 mm, glabrous;

style strongly sunken into ovary apex.

capsular, subglobose or globose to ovoid, (with unthickened sutures), dry.

subglobose, 2.5–4 × 3.5–5.3 mm, glabrous;

placentae central to nearly basal.

40–100, ellipsoidal to obovoid, ± rectangular or angular-ovoid, or narrowly conic, flattened or not, (sometimes slightly winged);

testa cells elongate or isodiametric.

angular-ovoid to obovoid or narrowly conic, not winged;

testa cells isodiametric.

= 12.