Flora of North America species comparison

petiole 2–7 cm, puberulent, short stipitate-glandular;

blade broadly reniform or cordate-orbiculate to deltate-ovate, nearly equally to irregularly 5-lobed, cleft nearly 1/4 to midrib, 2–7 cm, base subtruncate to cordate, surfaces puberulent to whitish-tomentose abaxially, puberulent adaxially or puberulent and colorless, sessile-glandular on both surfaces, lobes deltate to obtuse, margins finely 2–3 times crenate and denticulate or serrate, apex broadly acute.

alternate, simple;

stipules present;

petiole present [absent];

blade lobed or cleft (unlobed in R. speciosum and R. viburnifolium), margins toothed [subentire].

pendent to stiffly spreading or ascending or erect, 5–40-flowered racemes, 5–15 cm, axis crisped-pubescent and stipitate-glandular, flowers evenly spaced.

terminal or axillary, usually racemes, sometimes corymbs or solitary flowers.

jointed, 5–10 mm, pubescent, stipitate-glandular;

bracts oblanceolate or lanceolate, 2–12 mm, with scattered, short hairs and stalked glands.

hypanthium white, pink, rose, or red, tubular to campanulate, 3–7 mm, pubescent, stipitate-glandular;

sepals not overlapping, spreading or reflexed, white, pink, or red, ovate-elliptic or oblong to oblanceolate or lanceolate, 4–5 mm;

petals not or nearly connivent to connivent, erect, white or pink to red, obovate-spatulate to oblong or almost square, not conspicuously revolute or inrolled, 1–3.5 mm;

nectary disc not prominent;

stamens shorter than to as long as petals;

filaments linear or slightly expanded at base, 1.2–2 mm, glabrous;

anthers cream, oblong-oval, 0.5–0.8 mm, apex shallowly notched;

ovary stipitate-glandular to strongly stipitate-glandular and crisped-puberulent;

styles connate nearly to stigmas, 4–6 mm, glabrous or with scattered, stipitate glands at base.

bisexual (unisexual in R. diacanthum);

perianth and androecium epigynous;

hypanthium wholly or partially adnate to ovary, free distally;

sepals usually 5 (R. speciosum 4), connate proximally;

petals usually 5 (R. speciosum 4), distinct;

nectary disc present;

stamens (4–)5, antisepalous, inserted on hypanthium, free or adnate to hypanthium, distinct;

anthers introrsely dehiscent by longitudinal slits;

pistils 1, 2-carpellate;

ovary partly to completely inferior, 1-locular;

placentation parietal;

ovules anatropous, bitegmic, crassinucellate;

styles 2, distinct, connate proximally or nearly completely;

stigmas 2, terminal, capitate.

baccate.

palatable but insipid, blue-black, glaucous, ovoid or globose, 3–9(–10) mm, yellowish or greenish stipitate-glandular.

(3–)10–60, brown to black, fusiform to oblong-ellipsoid or ellipsoid;

embryo straight;

endosperm copious, oily, not starchy.

= 16.