Flora of North America species comparison

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

erect, minutely stellate-hairy to 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 pedicel, filiform to linear, often curved or twisted, 4–9 mm, subequal to corresponding petiole;

petiole 4–7 mm, ca. 1/10 length of blade, sparsely stellate-hairy;

blade lanceolate-elliptic to subrhombic, 5–9 cm, 4–7 times longer than wide, base cuneate, margins crenulate-serrate to base, apex acute, surfaces sparsely stellate-hairy abaxially, glabrescent adaxially.

axillary solitary or 2–4 clustered flowers.

axillary solitary flowers, often congested apically.

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

unarticulated, 0.5–1 cm, shorter than subtending leaf, shorter than or subequal to calyx.

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

petals yellow, rarely white, 5 mm;

staminal column glabrous;

style 5-branched.

calyx ribbed, 7–9 mm, glabrous, lobes trullate;

petals yellow, 15 mm;

staminal column hairy;

style 9–12-branched.

subconic, 4–5 mm diam., hairy;

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

oblate, 6–7 mm diam., apically hairy;

mericarps 9–12, 5 mm, laterally reticulate, apex spined, spines 1.5–2 mm.

= 14, 28.