Flora of North America species comparison

decumbent to ascending, much branched, elongate, glabrous or glandular-pubescent.

decumbent to erect, elongate, glandular-pubescent, infrequently glabrous.

petiole 1–6 cm;

blade ovate to lance-elliptic, 1–6 × 0.5–4 cm, margins entire to sinuate and ± undulate, surfaces glabrous or glandular-pubescent.

petiole 1–4 cm;

blade ovate elliptic-oblong to ovate, 1.5–6 × 0.5–3.5 cm, margins entire to sinuate, often undulate, adaxial surface glabrous or puberulent, abaxial surface thinly puberulent to pubescent.

peduncle longer than subtending petiole;

bracts lanceolate to obovate, 5–12 × 1–5 mm, papery, glabrate to glandular-pubescent;

flowers 25–60.

peduncle longer than subtending petiole;

bracts ovate to obovate, 5–20 × 3–10 mm, scarious, apex obtuse to acute, glandular-pubescent to villous;

flowers 25–75.

tube pale rose proximally to greenish distally, 15–25 mm, limb white, 7–12 mm diam.

tube rose to greenish, 10–20 mm, limb white, 5–8 mm diam.

winged, broadly obdeltate or cordate in profile, 6–10 × 4–10 mm, thin, usually coriaceous, rarely indurate, base attenuate, apex prominently beaked;

wings (2–)5 (when 2, folded to form single deep groove), without dilations, broad, thin, without cavities.

broadly turbinate, apex truncate or rounded and slightly beaked, or fruit ± rhombic in profile, 5–12 × 4–8.5 mm, scarious, tapered at both ends;

wings (2–)5 (often 2 on periphery of inflorescence and folded together), dilated distally and flattened perpendicular to plane of lamina, dilations longer than wide, thin walled, cavities extending throughout.