Flora of North America species comparison

usually single, wood dense.

usually persistent, cauline, alternate, imparipinnately compound;

stipules absent;

petiole present;

blade usually chartaceous, margins entire, leaflets alternate or subopposite (often darkening upon drying), bases of lateral leaflets often oblique.

terminal or lateral, simple racemes (either of separate flowers or glomerules of flowers), pendent, or compound thyrses.

unisexual, perianth and androecium hypogynous;

epicalyx bractlet absent;

hypanthium absent;

sepals [3–]5, basally connate or distinct;

petals [3–]5, sometimes 0, distinct, stramineous to maroon or red, usually ligulate;

stamens or staminodia (if present) (3–)5, distinct, antipetalous, anthers longitudinally dehiscent; staminate flowers: (filaments unappendaged) intrastaminal discs or, rarely, column present, pistillodia usually conic and hairy or vestigial; pistillate flowers: staminodia present or absent;

pistils 1, 2–3(–4)-carpellate, ovary borne on disc or gynophore, placentation apical, styles 2–3(–4), usually ± lacking, stigmas sessile and divergent on apices of ovaries;

ovules 2 or 3 per locule.

berries or samaras;

sepals often persistent;

stigmas persistent.

1, not arillate.