Flora of North America species comparison

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

erect, puberulent to glabrate.

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, subulate, 5–8 mm, subequal to petiole;

petiole 2–9 mm, much shorter than blade, minutely puberulent to glabrate;

blade narrowly linear to narrowly elliptic, 2–8 cm, 4–20 times longer than wide, base truncate, margins dentate to base, apex acute, surfaces minutely hairy abaxially, glabrous adaxially.

axillary solitary or 2–4 clustered flowers.

axillary solitary flowers, scattered along stem, little, if at all, apically congested.

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

slender, 0.5–4 cm, longer 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, 6–9 mm, basally hairy, lobes ovate;

petals yellow-orange, 12–15 mm;

staminal column sparsely and minutely hairy;

style 8–11-branched.

subconic, 4–5 mm diam., hairy;

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

oblate, 6–8 mm diam., sparsely hairy apically, otherwise glabrous;

mericarps 8–11, 3 mm, laterally reticulate, apex blunt to spinose, spines 0.2–1 mm.

= 14, 28.