Flora of North America species comparison

bark smooth to vertically furrowed, shredding;

twigs scattered, multicellular eglandular-hairy (hairs unbranched), otherwise glabrous or moderately unicellular-hairy.

bark ± smooth, not shredding;

twigs scattered, multicellular eglandular-hairy (hairs unbranched) and/or stipitate-glandular-hairy, otherwise glabrous or, sometimes, sparsely unicellular-hairy.

deciduous;

petiole unicellular- and stipitate-glandular-hairy;

blade ovate to obovate, 4–7.7(–9.4) × 1.2–2.5(–3.3) cm, thin, membranous, margins entire, plane, ciliate, eglandular-hairy, apex acute to obtuse, often mucronate, abaxial surface glabrous or unicellular-hairy, adaxial surface usually scattered eglandular-hairy, usually also unicellular-hairy.

deciduous;

petiole multicellular eglandular- and/or stipitate-glandular-hairy, sometimes also unicellular-hairy;

blade ovate to obovate, 2–5.5(–6.5) × 0.8–2(–3) cm, thin, membranous to chartaceous, margins entire, plane, ciliate, eglandular-hairy, apex acute to obtuse, often mucronate, abaxial surface glabrous or, rarely, sparsely scattered eglandular-hairy, sometimes sparsely (rarely densely) unicellular-hairy, adaxial surface (lustrous to dull), glabrous or sparsely scattered stipitate-glandular-hairy, sometimes also sparsely unicellular-hairy.

6–7-flowered;

bracts similar to bud scales.

4–13-flowered;

bracts similar to bud scales.

4–12 mm, eglandular- and/or stipitate-glandular-hairy, otherwise glabrous or moderately unicellular-hairy.

4–15(–20) mm, eglandular- and/or stipitate-glandular-hairy, otherwise glabrous or sparsely (rarely moderately) unicellular-hairy.

opening before or with leaves, erect to horizontal, very fragrant;

calyx lobes 0.1–3 mm, scattered eglandular-hairy and/or stipitate-glandular-hairy, otherwise sparsely to moderately unicellular-hairy, margins eglandular-hairy;

corolla white, sometimes pink-tinged, with contrasting yellow blotch on upper lobe, funnelform, 25–42 mm, scattered stipitate-glandular-hairy (hairs often continuing in lines up lobes), otherwise sparsely to moderately unicellular-hairy on outer surface, petals connate, lobes 9–21 mm, tube usually ± gradually expanded into lobes, 15–31 mm (longer than lobes);

stamens 5, much exserted, ± unequal, 37–69 mm.

opening before or with leaves, erect to horizontal, usually very fragrant and/or nearly mephitic-scented;

calyx lobes 0.7–5.5(–10) mm, marginal and scattered stipitate-glandular- or, less commonly, eglandular-hairy, sometimes also unicellular-hairy;

corolla white, usually flushed pink or rose (especially on tube), without blotch on upper lobe, funnelform, 23–58 mm, scattered, usually conspicuous, multicellular stipitate-glandular-hairy (hairs forming prominent band along middle of each lobe), otherwise glabrous or, sometimes, sparsely unicellular-hairy on outer surface, petals connate, lobes 8–24 mm, tube rather gradually expanded into lobes, 16–35 mm (equaling or longer than lobes);

stamens 5, much exserted, ± unequal, 32–63 mm.

borne on erect pedicels, 14–22 × 3–4 mm, sparsely to moderately multicellular eglandular-hairy, otherwise moderately to densely unicellular-hairy.

borne on erect pedicels, 10–24 × 4–8 mm, usually densely stipitate-glandular-hairy, otherwise glabrous or densely unicellular-hairy.

without distinct tails;

testa expanded, dorsiventrally flattened, ± loose.

without distinct tails, flattened portion of testa well developed at each end;

testa expanded, dorsiventrally flattened, ± loose.

bud scales glabrous or glabrate abaxially, margins unicellular-ciliate.

bud scales glabrous or densely unicellular-hairy abaxially, margins usually unicellular-ciliate.

= 26.

= 26.