Flora of North America species comparison

thorns sparse to abundant;

young twigs rusty-hairy (gray-hairy in 1 variation), glabrescent.

thorns sparse to abundant;

young twigs reddish brown-hairy, glabrescent.

stipules 3–8 mm;

petiole 2–5 mm;

blade oblanceolate or obovate, 1.5–6 × 0.5–2.5 cm, base cuneate, margins remotely serrulate or crenulate, often entire proximally, apex obtuse, emarginate, or short-apiculate, surfaces glabrate.

stipules 3–8 mm;

petiole 1–3 mm;

blade oblanceolate or narrowly obovate, 2.5–4.5 × 0.5–1.2 cm, base cuneate, margins entire, rarely with minute teeth near apices, apex truncate or retuse, rarely rounded, abaxial surface brown-hairy, becoming glabrate and pale green, not glaucescent, adaxial glabrous.

3–4 cm diam.

3–4 cm diam.

2–8 mm, usually glabrate, rarely sparsely appressed brown- or gray-hairy.

5–12 mm, sparsely brown-hairy.

4–12 mm diam.;

hypanthium glabrate, rarely slightly hairy;

sepals triangular, 1–1.5 mm, apex obtuse;

petals suborbiculate, 3–4 mm, apex rounded.

8–10 mm diam.;

hypanthium densely hairy;

calyx brown- or yellowish brown-puberulent when young, glabrescent, sepals triangular, 1–1.3 mm, apex acute;

petals suborbiculate, 3–4 mm, apex slightly emarginate.

orange-red to dark red, 3–6 mm diam.;

pedicels 2–10 mm.

orange-red, 4–7 mm diam.;

pedicels 5–13 mm.

= 34 (China).