Flora of North America species comparison

bark smooth to vertically furrowed, shredding;

twigs sparsely to densely multicellular stipitate-glandular-hairy or unicellular-hairy, or glabrous, sometimes only unicellular-hairy.

bark smooth to vertically furrowed, shredding;

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

deciduous;

petiole multicellular eglandular- or stipitate-glandular-hairy and unicellular-hairy;

blade ovate or obovate to elliptic, (2.5–)3.5–8.2(–10.8) × 1.2–2.9(–3.6) cm, thin, membranous, margins entire, plane, ciliate, eglandular-hairy, sometimes also stipitate-glandular-hairy, apex acute to obtuse, often mucronate, abaxial surface glabrous or sparsely unicellular-hairy, often also stipitate-glandular-hairy (or, rarely, stipitate-glandular- and eglandular-hairy), adaxial surface sparsely scattered, multicellular eglandular- and/or stipitate-glandular-hairy and unicellular-hairy, or glabrous.

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.

3–15-flowered;

bracts similar to bud scales.

6–7-flowered;

bracts similar to bud scales.

9–26 mm, stipitate-glandular- and, sometimes, also eglandular-hairy.

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

opening with leaves or after they have expanded, erect to horizontal, fragrant or mephitic-scented;

calyx lobes 1–4(–9) mm, often stipitate-glandular- and/or eglandular-hairy, sometimes also unicellular-hairy, margins usually stipitate-glandular-hairy;

corolla white with contrasting yellow blotch on upper lobe, white and pink or salmon, or pink with orange blotch on upper lobe, rarely white with yellow lines at throat, or with tube white to red, funnelform, 30–58 mm, stipitate-glandular-hairy and, rarely, also eglandular-hairy, otherwise sparsely to moderately unicellular-hairy or these hairs absent on outer surface, petals connate, lobes 13–29 mm, tube gradually expanding into lobes, 15–29 mm (equaling or longer than lobes);

stamens 5, much exserted, ± unequal, 40–75 mm.

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.

borne on erect pedicels, 12–22 × 4–14 mm, multicellular stipitate-glandular-hairy, sometimes also eglandular-hairy, otherwise sparsely unicellular-hairy (unicellular hairs rarely absent).

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

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

testa expanded, dorsiventrally flattened, ± loose.

without distinct tails;

testa expanded, dorsiventrally flattened, ± loose.

bud scales sparsely to densely unicellular-hairy abaxially, rarely also sparsely eglandular- or stipitate-glandular-hairy, margins unicellular-ciliate, or with glands and cilia mixed, or glandular.

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

= 26.

= 26.