Flora of North America species comparison

thorns sparse to abundant;

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

thorns usually abundant;

young twigs brown-hairy, glabrescent later.

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 2–4 mm;

petiole 2–6 mm;

blade elliptic, oblong, or oblanceolate, sometimes ovate-lanceolate, 1–7 × 0.4–1.8 cm, base rounded to cuneate, margins crenulate to sparsely serrulate, apex acute or short-apiculate, sometimes obtuse, surfaces glabrous or nearly so.

3–4 cm diam.

2–5 cm diam.;

peduncles brown-hairy or glabrous.

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

4–10 mm, glabrous.

4–12 mm diam.;

hypanthium glabrate, rarely slightly hairy;

sepals triangular, 1–1.5 mm, apex obtuse;

petals suborbiculate, 3–4 mm, apex rounded.

6–10 mm diam.;

hypanthium glabrous;

sepals triangular, 1 mm, apex acute;

petals orbiculate, 3–5 mm, apex rounded.

orange-red to dark red, 3–6 mm diam.;

pedicels 2–10 mm.

orange-yellow, orange, or red, subglobose, 3–8 mm diam.;

pedicels 5–12 mm.

= 34 (China).