Key C

Leaves simple, cordate, or subcordate at base; with prominent posterior lobes, black punctate below.

la. Leaf blades usually subcordate, stiffly coriaceous with two or more basal veins strongly ascending, roughly parallel to the midrib to beyond the middle of the blade; pistils early emergent, quadrangular in cross-section; berries white; Costa Rica, Panama, Colombia.................. A. lentii Croat & Baker

1b. Leaf blades usually conspicuously lobed at the base, subcoriaceous, the basal veins not as above, usually forming a collective vein near the margin, usually only the uppermost extending above the middle of the blade; pistils not markedly early emergent, terete in cross-section; berries red, orange, or purplish at maturity.

2a. Blades mostly 2-3 times longer than broad, the anterior lobe usually more or less oblong and sometimes constricted at the base or narrowly triangular. If not

3a. Posterior lobes mostly less than 1.25 times longer than broad, the sinus parabolic to spathulate, often closed; northern Oaxaca in the Sierra Madre Oriental. ............................. A. longipetialum Matuda

3b. Posterior lobes mostly more than 1.5 times longer than broad, usually directed prominently outward; the sinus campanulate to spathulate, not closed; southern Oaxaca and Chiapas to Belize, Guatemala and Honduras.

4a. Inflorescences usually 1.5-3 times longer than the petioles; berries subglobose, red-orange to orange-red; seeds 6-9 per berry, less than 3 mm long. ........................................ A. verapazense Engl.

4b. Inflorescences usually less than 1.5 times longer than petioles.

5a. Spadix olive green at anthesis; primary lateral veins prominently raised below (fresh and dry); restricted to southwestern Oaxaca. ................... A. chiapasense ssp. tiaxiacense (Matuda) Croat

5b. Spadix dark violet-purple at anthesis; primary lateral vein^ flat or prominulous below; southeastern Chiapas and western Guatemala..... A. chiapasense Standl. ssp. chiapasense

2b. Blades mostly 1.25-1.5 times longer than broad, rarely more than 2 times longer than broad, the anterior lobe usually more or less ovate (rarely with the anterior lobe somewhat oblong or narrowly triangular).

6a. Blades conspicuously coriaceous, acute at the apex with a short apiculum; southeastern Oaxaca...... A. riograndicolum Matuda

6b. Blades usually only subcoriaceous (at least when dry), acuminate at apex; widespread from Chiapas to Honduras.

7a. Inflorescences usually 1.5-3 times longer than petioles; spathe usually less than half as long as the spadix; berries subglobose, red-orange to orange-red; seeds 3-5 per locule (7-9 per berry), less than 3 mm long............. A. verapazense Engl.

7b. Inflorescence usually less than 1.5 times as long as the petioles; spathe usually more than half as long as spadix; berries obovoid, bright red; seeds 1 per locule (2 per berry), more than 4.5 mm long.......................... A. lucens Standl. ex Yuncker