Chlorospatha macphersonii Croat & L.P.Hannon

Terrestrial herb, 50-60 cm tall (all measurements made from dried material); stem occasionally weakly woody, decumbent, with remnants of old cataphylls persisting semi-intact along its length; internodes 2-6 cm long, 0.6-2 cm diam., drying finely wrinkled, matte to weakly glossy, pale-medium brown, occasionally weakly gray-tinged; cataphylls 12-18 cm long, acuminate at apex, drying matte to weakly glossy, medium reddish brown. LEAVES 3, erect-spreading; petioles 25-34 cm long, drying glabrous, matte, dark brown, frequently blackish toward apex, sheathed 21-26.5 cm, slightly more than 3/4 of total length; sheath free-ending at apex; free portion 2.5-4 mm diam. midway, sulcate; blades ovate-cordate, 17-25 cm long, 9-12.5 cm wide, 1.7-2 times longer than wide, gradually or abruptly acuminate at apex, broadest at or slightly below middle, weakly broader across anterior lobe than at base (measured tip to tip across posterior lobes), rarely much broader, fleshy; upper surface weakly bullate, drying matte to weakly glossy, dark yellow-brown; lower surface reticulate, drying semi-glossy, yellow brown to yellow green, weakly to moderately paler; anterior lobe 13-19 cm long, 9-12.5 cm wide, 1.3-1.6 times longer than wide, (2.8)3.8-4.8 times longer than posterior lobes, broadest at or below middle, ± symmetrical to weakly inequilateral; posterior lobes directed toward the base, 3-5 cm long, 3.5-5 cm wide, usually as wide as long, occasionally wider than long, bluntly to narrowly rounded at apex, broadest at base, the sinus oblong to narrowly V-shaped or closed with the lobes overlapping; sides ± symmetrical, the inner side acute to weakly rounded toward base, briefly attenuate and weakly confluent with opposite lobe, obscuring apex of petiole; outer side weakly convex; all orders of venation ± sunken on upper surface, moderately to prominently raised, ± granular-puberulent on lower surface, drying ± raised, concolorous or weakly paler to weakly darker than surface, frequently tan-colored; midrib round-raised on lower surface; basal veins 4-5 branching off, 3-4 acroscopic, 1-2 basiscopic, the 1st usually free to base, 2nd and/or 3rd fused, forming a short posterior rib 0.5-2 cm long; primary lateral veins 4-5 pairs, arising at 40-60°, weakly arcuate; collective veins 3, the innermost arising from one of the lower-most basal veins, loop-connected with all preceding lateral veins, moderately scalloped, 3-11 mm from margin. INFLORESCENCES erect, 2-3 per axil; peduncle held within the sheath, 17-20 cm long, 1-3 mm diam., drying matte, dark blackish brown; spathe erect, ca. 15 cm long, acuminate at apex, weakly or not at all constricted between tube and blade; spathe tube green or greenish red on outer surface, 8-8.5 cm long, 6-7 mm diam., drying matte, dark blackish brown on outer surface, weakly glossy and red-tinged on inner surface; spathe blade whitish green to yellowish green on outer surface, ca. 6.3 cm long, 7-7.5 mm diam., drying weakly glossy, dark blackish brown on outer surface, weakly glossier on inner surface; spadix erect, ca. 12.2 cm long, sessile, adnate to spathe ca. 7.5 cm at base, the entire length of pistillate portion and onto sterile staminate portion ca. 7 mm; pistillate portion ca. 6.7 cm long, ca. 4 mm diam., weakly broadest midway; fertile staminate portion white, ca. 4.7 cm long, 3-4.5 mm diam., narrowly rounded at apex, clavate, drying medium-dark orangish brown; sterile staminate portion ca. 1.5 cm long, 2-3 mm diam., broadest at apex, the axis naked in basal 3 mm, drying medium-dark orangish brown; pistils ± laxly arranged, ca. 3 across the axis (viewed from above), ca. 2 mm long; ovaries subglobose to ± cylindrical, ca. 1-1.5 mm long, 1.5-2 mm diam., drying dark reddish brown; style mantle-like, ca. 0.5 mm long, 1.5-1.8 mm diam., comprising ca. 1,4-11.3 of the length of pistil, as broad as ovary apex, briefly attenuate, the margins weakly or not at all coherent with those of adjacent styles; stigma ca. 0.5 mm diam., weakly elevated on and weakly broader than narrowed portion of style; synandria 1-1.5 mm long, ca. 2 mm diam., coherent, truncate, (2)3-4-lobed, (2)3-4-androus (mostly 4); sterile flowers 1-1.5 mm long, 1.5-2 mm diam., weakly coherent, in 6 whorls, 2-5-branched, the branches truncate and broadest at apex, weakly narrower below. INFRUCTESCENCE 11-12.5 cm long, ca. 1 cm diam., drying matte, dark reddish brown (almost black) on outer surface. BERRIES ca. 5 mm long, 5 mm diam., drying dark reddish brown.