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 subulate, 2 mm;

petiole shorter than blade;

blade ± concolorous, ovate, 2–10 cm (often smaller), somewhat longer than wide, base cordate, margins irregularly serrate, apex acute, surfaces minutely stellate-pubescent.

stipules usually persistent, subulate, lanceolate, or filiform;

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

involucel absent.

solitary flowers or terminal panicles.

calyx 3–5 mm, lobes not overlapping, reflexed in fruit, lanceolate-ovate, to 8 mm wide;

corolla yellow throughout, petals 5–10 mm;

staminal column glabrous;

style 6–9-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, 2 mm, puberulent but appearing glabrous.

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

cask-shaped, 8–9 × 8–9 mm;

mericarps: apex acute or apiculate, surface tomentulose.

= 7, 8.

= 14.