Flora of North America species comparison

number not recorded, prostrate to erect;

bark reddish brown or grayish, papery, shredding;

lateral short shoots often present (bearing fascicles of leaves); unarmed; villous first year, then glabrous.

deciduous, sometimes persistent, cauline, alternate, usually ± odd-pinnate to subpalmate (jointed beyond stipules and at distal leaflet node), rarely ternate;

stipules persistent, proximally adnate to base of petiole, broadly lanceolate to ovate, margins entire;

petiole present;

blade ± ovate in outline, 0.5–2.6 cm, foliaceous, leaflets (3–)5(–7)[–9], proximal pairs confluent on rachis, linear to narrowly elliptic or oblong, margins flat or revolute, entire, venation pinnate, surfaces glabrous or hairy.

terminal and on lateral twigs, solitary flowers or 2–7(–30)-flowered, loosely cymose, glabrous or hairy;

bracts present, ± leafy;

bracteoles absent.

present, straight.

occasionally functionally unisexual (plants monoecious), [10–]15–30[–35] mm diam.;

epicalyx bractlets 5;

hypanthium patelliform to cupulate, 1–2 × 3.5–5 mm, villous;

sepals 5, spreading, ovate [broadly elliptic];

petals 5, yellow [white], obovate to orbiculate, longer than sepals;

stamens 20 or 25(–30), shorter than petals, filaments filiform, glabrous, theca solitary, horseshoe-shaped, rimming broad connective, dehiscing by continuous marginal slit;

torus hemispheric;

carpels 30–100, hirsute, styles sub-basal, clavate;

ovule 1.

aggregated achenes, individually deciduous, 30–100, obliquely ovoid, 1.4–1.8(–2) mm, hirsute;

hypanthium persistent;

sepals persistent, erect;

styles tardily deciduous, jointed.

= 7.