Flora of North America species comparison

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

erect, subglabrous.

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, linear, 6–11 mm, 2 times length of corresponding petiole;

petiole 3–7 mm, 1/10 length of blade, subglabrous;

blade lanceolate-elliptic to subrhombic, 3–9 cm, 2.5–5 times longer than wide, base truncate, margins crenate or serrate to base, apex usually acute, surfaces glabrous.

axillary solitary or 2–4 clustered flowers.

axillary solitary or paired flowers.

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

articulated, 0.5–2(–3) cm, usually 2–3 times calyx length, 1/4–1/2 length of subtending leaf.

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, glabrous, lobes ovate;

petals yellow, 15 mm;

staminal column hairy;

style 10–12-branched.

subconic, 4–5 mm diam., hairy;

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

subconic, 6–7 mm diam., minutely hairy apically;

mericarps 10–12, 5 mm, laterally reticulate, apex spined, spines 1.5 mm.

= 14, 28.