Flora of North America species comparison

thorns sparse to abundant;

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

young twigs gray-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 4–8 mm;

petiole 2–5 mm;

blade elliptic or ovate to lanceolate or oblanceolate, 2–4 × 0.7–1.5 cm, base cuneate, margins finely crenulate-serrulate, apex acute, rarely obtuse, abaxial surface slightly hairy when young, glabrescent, adaxial glabrous.

3–4 cm diam.

3–4 cm diam.;

bracteoles in distal axils 4–10 × 3–4 mm.

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

3–10 mm, with coarse pale hairs.

4–12 mm diam.;

hypanthium glabrate, rarely slightly hairy;

sepals triangular, 1–1.5 mm, apex obtuse;

petals suborbiculate, 3–4 mm, apex rounded.

6–8 mm diam.;

hypanthium finely hairy;

sepals triangular, 1.5–2 mm, apex acute;

petals suborbiculate, 3–5 mm, apex rounded.

orange-red to dark red, 3–6 mm diam.;

pedicels 2–10 mm.

bright red, 5–8 mm diam.;

pedicels 5–12 mm.

= 34 (China).

= 34 (Europe).