Flora of North America species comparison

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

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, 4–8 mm, 1/2–1 times length of corresponding petiole;

petiole 6–17 mm, to 1/4 length of blade, obscurely hairy;

blade narrowly lanceolate or elliptic, 2.5–7 cm, 6–10 times longer than wide, base truncate, margins dentate to base, apex acute, surfaces obscurely hairy abaxially, glabrate adaxially.

axillary solitary or 2–4 clustered flowers.

axillary solitary flowers.

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

slender, 2–4(–6) cm, often equaling subtending leaf, much 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, 7–10 mm, obscurely stellate-hairy, lobes triangular;

petals yellow, 12–17 mm;

staminal column sparsely hairy;

style 8–10-branched.

subconic, 4–5 mm diam., hairy;

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

oblate, 8–9 mm diam., apically hairy;

mericarps 8–10, laterally reticulate, apex spined, spines 1 mm.

= 14, 28.

= 28.