Flora of North America species comparison

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

erect, with simple 1–2 mm hairs, sometimes also minutely stellate-hairy.

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.

distichous;

stipules free from petiole, subfalcate, 4–10 × 0.5–1 mm or less, often exceeding petiole, margins ciliate;

petiole 5–6 mm, 1/15–1/5 blade length, hirsute;

blade elliptic-lanceolate, 2.5–9 × 1–4 cm, 2 times longer than wide, base rounded, margins short-serrate at least distally, entire basally, apex acute, surfaces glabrous or with minute scattered stellate hairs and simple appressed antrorse hairs.

axillary solitary or 2–4 clustered flowers.

axillary congested glomerules, sometimes solitary or paired flowers.

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

0.3–0.5 cm, subequal to or shorter than subtending petiole, shorter than to 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, 5–6 mm, often ciliate, with scattered minute stellate hairs, lobes triangular;

petals yellow, 8–10 mm;

staminal column glabrous;

style 7- or 8-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., glabrous or axially minutely puberulent;

mericarps 7 or 8, 3 mm, smooth dorsally, laterally somewhat reticulate, apex spined, spines 2 mm, apically minutely puberulent.

= 14, 28.

= 28.