Flora of North America species comparison

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

erect, minutely stellate-hairy, hairs 0.3–0.4 mm, sometimes also with staminal column hairy;

style 8-branched.

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.

axillary solitary or 2–4 clustered flowers.

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

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

petals yellow, rarely white, 5 mm;

staminal column glabrous;

style 5-branched.

subconic, 4–5 mm diam., hairy;

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

oblate, 5–6 mm diam., apically hairy;

mericarps 8+, 3 mm, strongly reticulate laterally, apically dehiscent, apex 2-spined or not, spines to 1 mm, sometimes suppressed, apex hispid.

= 14, 28.