Flora of North America species comparison

petiole 1–2.5 cm, pubescent, stipitate-glandular;

blade broadly ovate, 3–5-lobed, cleft less than 1/2 to midrib, 1.5–2.5 cm, base semitruncate or slightly cordate, surfaces abaxially pubescent and sessile- or stipitate-glandular, adaxially glabrous or sparsely pubescent, lobes cuneate-rounded, margins crenate-dentate, apex rounded.

alternate, simple;

stipules present;

petiole present [absent];

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

pendent, solitary flowers or 2-flowered racemes, 2–4 cm, axis short-pubescent, glandular.

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

not jointed, 3–6 mm, pubescent, stipitate-glandular;

bracts broadly ovate, 3–5 mm, pubescent, stipitate-glandular.

hypanthium crimson, conic, 2.5–3.5 mm (1/4–1/3 as long as sepals), white-pilose, with red, stalked glands and red bristles;

sepals not overlapping, reflexed, reddish purple or greenish purple, oblong-lanceolate, 7–11 mm;

petals connivent, erect, white or pinkish to yellow, broadly flabellate-cuneate, often with inrolled margins, 3–4 mm;

nectary disc not prominent;

stamens 1.5–1.8 times as long as petals;

filaments linear, 3–5 mm, glabrous;

anthers white or tan, lanceolate-sagittate, 2.5 mm, apex acute, mucronate;

ovary somewhat pubescent and strongly purplish glandular-bristly with longer glandless bristles among gland-tipped hairs;

styles connate to middle, 6–8 mm, glabrous.

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.

not palatable, reddish purple, ellipsoid-globose, 10–13 mm, pubescent, glandular-bristly.

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

embryo straight;

endosperm copious, oily, not starchy.