Flora of North America species comparison

petiole 1.5–5 cm, pubescent, stipitate-glandular;

blade round-ovate, 3–5-lobed, cleft 1/4–1/3 to midrib, 1.5–5 cm, base truncate to cordate, surfaces finely pubescent, stipitate-glandular, lobes rounded, margins with few shallow teeth, 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, 3–4 cm, axis pilose, stipitate-glandular.

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

not jointed, 3–4 mm, pubescent, stipitate-glandular;

bracts lanceolate-ovate, 2–3 mm, pubescent, stipitate-glandular.

hypanthium greenish white, conic, as wide as long, 3 mm (1/4–1/3 as long as sepals), stipitate-glandular;

sepals not overlapping, reflexed, white, pink-tinged at base, oblong-lanceolate, 6–11 mm;

petals connivent, erect, white, oblong, inrolled, 3–5 mm;

nectary disc not prominent;

stamens 2 times as long as petals;

filaments linear, ca. 6 mm, glabrous;

anthers cream, lanceolate-sagittate, 3 mm, apex mucronate;

ovary densely glandular, with longer glandless bristles;

styles connate to middle, 9–11 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.

palatability not known, golden yellow, globose, 8–10 mm, glandular-bristly.

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

embryo straight;

endosperm copious, oily, not starchy.