Flora of North America species comparison

deciduous [persistent], alternate, simple [palmately compound];

stipules present, persistent;

petiole present, glands absent;

stipels present, often with basal glands;

blade palmately lobed [unlobed], margins serrulate-crenulate [subentire], laminar glands absent;

venation palmate [pinnate].

bisexual, apparently axillary (technically terminal on axillary short shoots), pseudanthia (consisting of 2, often showy, involucral bracts subtending 2 cymules, one with [1–]3 pistillate flowers and 1–3 involucellar bractlets, and one with [4–]10[–40] staminate flowers, 1–5 involucellar bractlets, and a series of resiniferous [non-resiniferous] bractlets forming condensed gland; involucral bracts open when flowers receptive, enveloping fruits [deciduous] as seeds develop);

glands subtending each bract 0.

present.

sepals 3–6, valvate, distinct;

petals 0;

nectary absent;

stamens [5–]25–35[–90], distinct, borne on elongated [flat, dome-shaped] receptacle, thus appearing connate proximally;

pistillode absent.

sepals [5–]8–12, distinct;

petals 0;

nectary absent;

pistil 3-carpellate;

style 1, unbranched.

capsules.

globose to subglobose;

caruncle absent.

[lianas or shrubs], twining [trailing], monoecious [gynodioecious];

hairs unbranched, always some stinging [none stinging, sometimes glandular];

latex absent.

= 11, 13.