Flora of North America species comparison

erect, sometimes trailing (A. parvulum) or procumbent or ascending (A. wrightii), glabrescent or pubescent, sometimes viscid (A. hirtum, A. reventum, A. trisulcatum).

stipules lanceolate;

petiole subequal to blade;

blade concolorous, broadly ovate to suborbiculate, 8–15 cm, ± as long as wide, base cordate, margins crenulate, apex acuminate, surfaces softly pubescent.

stipules usually persistent, subulate, lanceolate, or filiform;

blade elliptic, ovate, [cordiform], sometimes shallowly lobed, but not maplelike [sometimes umbellate];

involucel absent.

usually solitary flowers, sometimes cymose or racemose.

calyx 10 mm, lobes not overlapping, erect in fruit, ovate;

corolla pale yellow throughout, petals 8–13 mm;

staminal column glabrous;

style 13–15-branched.

calyx not accrescent (except A. hulseanum, A. hypoleucum, A. palmeri, and A. wrightii), not inflated, not completely enclosing fruit, lobes not ribbed, lanceolate, ovate, cordate, or acuminate;

corolla usually yellow or orange, less often pinkish, sometimes with dark red center;

staminal column included or exserted;

ovules 3(–6) per carpel;

style 5–25-branched;

stigmas sometimes black, capitate.

schizocarps, erect, not inflated, globose, ovoid, oblate, cask-shaped, or cylindric, usually not indurate, variably hairy but not setose;

mericarps 5–25, 1-celled follicle, adherent to adjacent mericarps and persistent on their axes, without dorsal spur, apex usually acute or acuminate to spinescent, sometimes rounded or obtuse, abaxially dehiscent.

3 per mericarp, 3–4 mm, minutely puberulent.

usually 3–6 per mericarp, usually turbinate, puberulent or scabridulous.

broadly ovoid, 15 × 20 mm;

mericarps: apex spinose, spines divergent, 3–6 mm, hirsute.

= 7, 8.

= 84.