Flora of North America species comparison

erect, minutely stellate-hairy, hairs to 0.5 mm.

erect, glabrescent.

stipules free from petiole, 1-veined, subulate, 3–6 mm, 1/2 as long as petiole;

petiole 5–15 mm, usually 1/4–1/2 length of blade, sometimes shorter, minutely stellate-hairy, hairs to 0.5 mm, usually with small spinelike tubercle on stem just below its attachment;

blade ovate, lanceolate, or narrowly oblong, 2–6 cm, smaller apically, 2–5 times longer than wide, base subcordate, margins crenate-serrate to base, apex usually acute, surfaces stellate-tomentulose abaxially, glabrate adaxially.

stipules free from petiole, 1-veined, linear, 3–6 mm, subequal to petiole;

petiole 2–5 mm, ca. 1/4 length of blade, glabrescent;

blade lanceolate-elliptic to round, 1.5–5 cm, somewhat longer than wide, base truncate, margins dentate apically, entire basally, apex acute or obtuse, surfaces minutely hairy.

axillary solitary or 2–4 clustered flowers.

axillary solitary subsessile flowers.

0.5–1 cm, subequal to calyx and subtending petiole.

not slender, 0.4–1.2 cm, usually shorter than calyx.

calyx angulate, 5–7 mm, minutely tomentose, lobes triangular;

petals yellow, rarely white, 5 mm;

staminal column glabrous;

style 5-branched.

calyx ribbed, 5–8 mm, glabrescent, lobes acute or acuminate;

petals yellow, 6–8 mm;

style 8–10-branched.

subconic, 4–5 mm diam., hairy;

mericarps 5, 3–4 mm, somewhat rugose, apex spined, spines 1 mm, antrorsely hairy.

subconic, 5–6 mm diam., glabrous;

mericarps 8–10, laterally reticulate, apex spined, spines to 1.5 mm, puberulent.

= 14, 28.