Chlorospatha corrugata Bogner & Madison

Terrestrial herb, to 1 m tall; stem possibly erect, 10 cm long or longer, with remnants of old cataphylls persisting ± intact along its length and weakly fibrous, the fibers pale; sap milky; internodes 1-2 cm long, 1.5-2.5 cm diam., brown, drying 1-2 cm diam., matte, dark brown; cataphylls (6)10-23 cm long, green, drying weakly glossy to semi-glossy, medium brown, with some pale, linear fibers. LEAVES 3-4, erect-spreading; petioles (13)30-63 cm long, entirely weakly minutely puberulent to granular-puberulent or in part only toward apex, medium green, drying matte, dark brown to greenish brown, sheathed 6-18 cm, ca. (1/4)1/3 of total length; sheath decurrent at apex; free portion (0.25)0.5-1 cm diam. midway; blades deeply 3-lobed or trisect (in some mature specimens), 26-35 cm long, 30-42 cm wide, 1.1-1.2 times wider than long, thinly coriaceous (dry), concolorous; upper surface conspicuously corrugate, weakly glossy, medium green, drying weakly glossy, medium to dark brown to brownish green or olive-green; lower surface reticulate, narrowly minutely colliculate along all veins, medium green, drying weakly glossy to semi-glossy, weakly to moderately paler; medial lobe 16-23.5 cm long, 9-12 cm wide, :±: elliptical, broadest at or above middle, 1.7-2.2 times longer than wide, shorter and narrower than lateral lobes, abruptly acuminate at apex, cuneate to acute toward base, narrowly attached, 1.4-1.8 cm wide at point of attachment (dry), weakly to moderately inequilateral, with one side to 1.8 times wider than opposite side midway; lateral lobes oblique or directed toward the apex, 15-30 cm long, (7)11-14.5 cm wide, 1.6-2.4 times longer than wide, abruptly acuminate to gradually acuminate at apex, broadest at or below middle, markedly inequilateral, the inner side always narrower, attenuate toward base, markedly narrowly or not at all confluent with medial lobe, the confluent portion 1-2 mm wide (moderately confluent in young plants); outer side to 7.3 times wider than inner side midway, usually broadly rounded at base and abruptly attenuate onto posterior rib or with a weakly to well developed posterior lobe or auricle 5.5-11.5 cm long, 6-10 cm wide, narrowly rounded to rarely bluntly acute at apex, separated from the lateral lobe by a slender posterior rib 1.5-2.2 cm long, the inner side ca. 3-5.5 cm wide, abruptly attenuate at base, the outer side broadly rounded, weakly to prominently or not at all constricted in area of petiole attachment; all orders of venation :±: raised, granular-puberulent to crispy-puberulent on lower surface, drying :±: raised, concolorous to weakly darker than surface; midrib deeply sunken on upper surface, weakly paler than surface, drying:±: concolorous, round-raised on lower surface; posterior rib naked 1.3-2 cm per side, round-raised on lower surface; posterior rib of posterior lobe (when present) naked 2-3 cm per side (including rachis), markedly curved, round-raised on lower surface, with 7-10 veins branching off, ca. 4 acroscopic, 5 basiscopic, quilted-sunken on upper surface, occasionally weakly paler than surface toward base, drying concolorous; primary lateral veins (on medial lobe) 4-6 pairs, arising at 25-35°, straight to weakly arcuate, quilted-sunken on upper surface, weakly paler than surface, round-raised on lower surface, drying concolorous; primary lateral veins (on lateral lobes) (7)8-10 on outer side, arising at 40-45°, moderately arcuate, aggregated toward base; secondary veins quilted-sunken on upper surface; tertiary veins in part sunken on upper surface; reticulate veins drying prominently prominulous on lower surface; collective veins 3, the innermost arising from one of the lowermost lateral veins at base, loop-connected with all preceding lateral veins, weakly scalloped, 3-8 mm from margin. INFLORESCENCES erect, to 3 per axil; peduncle held within the sheath, (3-3.5)8-13 cm long, 2.5-3 mm diam., granular-puberulent, pale green, drying ca. 2 mm diam., matte, dark brown; spathe erect, 4.5-5.3 cm long, acuminate at apex, margins in-rolled in apical 1-1.5 cm, weakly or not at all constricted between tube and blade; spathe tube pale to medium green or white on both surfaces, granular-puberulent to weakly minutely puberulent on outer surface, ca. 2.3 cm long, drying 3.5-4.5 mm diam., matte to weakly glossy, dark brown to reddish brown on outer surface, weakly paler on inner surface and densely cream-punctiform (speckles regularly rounded, appearing as subepidermal cellular inclusions), most densely so toward base; spathe blade white, green or yellowish, ca. 3 cm long, drying ca. 5 mm diam., paler than tube, marcescent, reflexing after anthesis; spadix erect, 3.5-4.9 cm long, sessile, ± cylindrical, adnate to spathe 6-9 mm at base, l/2-2/3 of the length of pistillate portion; pistillate portion whitish, 1-1.3 cm long, drying 2.5-3 mm diam., drying orangish; fertile staminate portion yellowish or white, 2-2.5 cm long, 2-4 mm diam., bluntly acute at apex, ± cylindrical to tapering, occasionally weakly narrowed at base, drying medium pinkish-tan; sterile staminate portion creamy yellow, 0.5-1 cm long, ca. 2.5 mm diam., cylindrical, weakly narrower than pistillate and fertile staminate portions, drying yellowish; pistils weakly coherent, ca. 4 across the axis (viewed from above), 1-1.5 mm long; ovaries 1.5-1.9 mm diam., subglobose, with axile placentation, drying pale yellowish; ovules hemianatropous; style mantle-like, 1-1. 5 mm diam., broadly spreading, moderately broader than ovary apex, the margins ± coherent with those of adjacent styles; stigma lemon-yellow, 0.7-0.8 mm diam., sessile or apparently so (possibly weakly elevated on narrowed portion of style), obtusely truncate, weakly depressed medially, drying medium reddish brown; synandria ca. 1.3 mm long, 1.8-2 mm diam., coherent, truncate, irregularly 3-4-lobed, 3-4-androus, with a few at apex sterile; pollen in tetrads, ca. 42 microns diam; sterile flowers ca. 1 mm long, 1.5-3 mm X 0.8-1.3 mm diam., ± elongated in direction of axis, coherent, truncate, irregularly subprismatic, arranged in 3-6 whorls. CHROMOSOMES 2n = 26. INFRUCTESCENCE 3.5 cm long, 1 cm diam. midway, drying dark brown, almost black, weakly minutely puberulent on outer surface. BERRIES not known.