Key E

Leaves simple, not lobed; blades neither cordate nor subcordate, punctate on one or both surfaces.

la. Spadix coiled or spiralled.

2a. Spathe showy, red to red-orange, ovate; leaf blades narrowly elliptic......... A. scherzerianum Schott

2b. Spathe not showy, reddish or green tinged purplish, linear or lanceolate-oblong; leaf blades oblong or ovate.

3a. Leaf blades oblong, to 80(150) cm long....... A. wendlingeri G. M. Barroso

3b. Leaf blades ovate, to 20 cm long........ A. louisii Croat & Baker

1b. Spadix not coiled or spiralled.

4a. Stipe 3-20 cm long; leaf blades oblanceolate; spadix pale violet-purple........... A. hacumense Engl.

4b. Stipe less than 1 cm long (usually the spadix sessile).

5a. Submarginal collective vein markedly impressed above, raised below and significantly more prominent than the primary lateral veins; berries bright red; leaves narrowly elliptic to narrowly oblanceolate, the apex acuminate........ A. bakeri Hook. f.

6a. Plants slender, scandent, with persisting, dilacerating cataphylls enclosing the internodes (except A. tonduzii with cataphylls entire, not dilacerating, deciduous); plants with long slender stems, often hanging from trees; berries translucent white or pale violet or purple; blades usually much less than 14 cm long. If Not

7a. internodes 2-21 cm long, not clothed in persistent cataphylls; leaf blades usually rounded at base; primary lateral veins usually three to six per side. ........ A. tonduzii Engl.

7b. internodes usually less than 2 cm long, rarely more than 4 cm long, at least the younger stems clothed in persistent, dilacerated cataphylls; leaf blades usually obtuse to acute at base; primary lateral veins usually numerous.

8a. Flowering spadix purplish, the pistil whitish, noticeably quadrangular, emerging prominently before stamens emerge; spathe persistently erect and more or less parallel to the spadix; berries broadly ovate to obovate, usually acute to apiculate at apex; plants growing at elevations from 0 to 800 m.............. A. trinerve Miq.

8b. Flowering spadix greenish, the pistil greenish, round to weakly quadrangular, emerging only after the stamens have opened; spathe strongly reflexed soon after opening; berries depressed-globose to globose, rounded to flat at apex; plants growing at elevations from 0 to 2,700 m.

9a. Spadix 16-60 flowered, 11-30 mm long at anthesis; blade punctate or not on upper surface, 4-16 cm long. .................. A. scandens (Aubl.) Engl. ssp. scandens

9b. Spadix 5-12(16) flowered, 2-10 mm long at anthesis; blade punctate on upper surface, 2-7.5 cm long. .......................................... A. scandens ssp. pusillum Sheffer

1Oa. Leaf blades oblong, strap-like; berries pale yellow-orange, broader in direction of axis than perpendicular to axis, sunken at apex.

11a. Spathe to 5 mm wide, early deciduous; leaf blades mostly 1-4 cm wide; spadix sessile................ A. friedrichsthalii Schott

11b. Spathe 1-1.5 cm wide, usually persisting; leaf blades mostly 4-7.5 cm wide; spadix short-stipitate...................... A. utleyorum Croat & Baker

lOb. Leaf blades not oblong; berries various.

12a. Peduncle filiform, long and very fragile, the spadix often pendent; spathe tinged reddish-violet; berries peach-orange; all vegetative parts brittle; 0- , , 800(1,400) m............ A. acutangulum Engl.

12b. Peduncle erect, elongate or short; spathe of various colors, usually green or la. purple; berries of various colors; vegetative parts not brittle; 0-1,700 m. Ib.

13a. Peduncle 3-sided and alate; petiole triangular in cross-section; Osa Península.................................. A. alatipedunculatum Croat & Baker

13b. Peduncle terete or nearly so (except A. austinsmilhii sharply angulate); petiole not triangular in cross-section; primarily Atlantic watershed.

14a. Leaf blades narrowly elliptic, the apex acuminate; spadix short (to 15 cm), on a stipe 1-6 mm long........................ A. ulleyorum Croat & Baker

14b. Leaf blades lanceolate, oblanceolate, elliptic, or obovate; spadix very long or short (A. lancifolium, A. paludosum); spadix sessile or nearly so.

15a. Leaf blades lanceolate to ovate-lanceolate or oblong-lanceolate, the apex long-acuminate; spadix grayish-white to * violet-purple.

16a. Peduncle terete; spadix grayish- or greenish-white, with four or five flowers visible in each spiral from any angle; berries violet-purple at maturity......................... A. lancifolium Schott

16b. Peduncle 2- or 3-sidcd, sharply angular; spadix becoming violet-purple (may be green prior to anthesis), with no more than three flowers visible in each spiral from any angle; berries white, tinged with violet-purple at apex. ....................................... A. austinsmithii Croat & Baker

15b. Leaf blades lanceolate to obovate but never long-acuminate at apex; spadix color various.

17a. Cataphylls thick, persistent, not dilacerating; petioles one sixth to one third as long as blades; blades almost oblong, coriaceous drying equally light green or yellow-green on both surfaces; fresh material with a conspicuous whitish midrib; berries orange; near sea level. ............... A. paludosum Engl.

17b. Cataphylls thin, soon weathering and deciduous; petioles various; blades mostly elliptic to oblanceolate or narrowly obovate, chartaccous or rarely coriaceous, drying usually brownish or grayish to blackened, usually paler on lower surface when fresh, the midrib not noticeably paler; berries orange to red; elevation various.

18a. Leaves usually with moderately short petioles ⁶ (one sixth to one third the length of the blade) and oblanceolate to narrowly obovate blades; peduncle and spadix usually stout; spadix usually very long, 4-10 mm diam. near base, gradually tapered to apex; berries pale red, flat at apex; 0-1,400 m. ..... A. ramonense Engl. ex K. Krause

18b. Leaves usually with longer petioles (one third to fully as long as blade) and elliptic or narrowly elliptic blades; peduncle slender or stout; spadix slender or stout, tapered or not, usually less than 5 mm diam. in A. acutangulum but sometimes to 10 mm diam. at base in A. durandii; berries orange to peach-orange.

19a. Blades short-acuminate, the acumen almost rounded or even emarginate at apex; cataphylls usually either deciduous or with few persisting as thin fibers, not forming a dense fibrous network.......... A. durandii Engl.

19b. Blades noticeably acuminate, the acumen obtuse at apex; cataphylls usually persisting as a dense fibrous network.......... A. acutangulum Engl.