Flora of North America species comparison

developing in 2d year, climbing, usually simple.

cauline, compound, petiolate;

blade with 3-5 orders of leaflets and lobes;

margins entire;

surfaces glabrous;

distal petiolules and reduced leaflets twining and tendril-like.

axillary, cymose-paniculate, multifloral.

bilaterally symmetric about each of 2 perpendicular planes;

sepals caducous, peltate with attachment near base;

corolla persistent, compressed-urceolate, becoming spongy;

outer petals connate except at apex, base saccate, apex with erect or reflexed, ovate to deltate lobe;

inner petals similar but with apical lobes connate over stigma;

filaments basally connate and adnate to petals;

ovary linear or narrowly oblong;

style persistent;

stigma ± 2-lobed.

dehiscent, 2-valved.

ca. 6, elaiosome absent.

or vinelike caulescent herbs, biennial, perhaps also annual, from taproots.