Anthurium concolor

Epiphytic or epilithic; stem to ca. 25 cm long, ca. 2.5 cm diam.; roots dense, spreading to erect-ascending, pale greenish white, ca. 4 cm long, 3- 5 mm diam.; cataphylls narrowly coriaceous to subcoriaceous to nearly membranous, lanceolate, sometimes hooked in the upper part, weakly l-ribbed near apex, 11-18 cm long, acuminate at apex with a subapical apiculum ca. 6 mm long at apex, drying dark brown to reddish brown (B & K yellow-red 3/ l0), persisting ± intact, ultimately deciduous. LEAVES erect; petioles (2)8-16 cm long, 10-1 5 mm diam., erect, D-shaped to ± quadrangular, shallowly sulcate adaxially, with thin, erect margins, prominently and unevenly 3-8-ribbed abaxially; geniculum somewhat thicker and slightly paler than petiole, 1-2 cm long; blades coriaceous to subcoriaceous, usually oblanceolate to ± elliptic, sometimes narrowly obovate, acute at apex, narrowly acute to narrowly rounded (less often rounded-subtruncate) at base, (30)40- 110 cm long, (13)18-36 cm wide, broadest above the middle, the margins moderately undulate; both surfaces semiglossy, upper surface medium green (B & K yellow-green 6/7.5), drying greenish to grayish brown; lower surface moderately to conspicuously paler greenish to reddish brown (B & K yellow-green 7/10); midrib flat with medial rib at base, becoming broadly acute toward the apex below, drying reddish brown; primary lateral veins 10-17 per side, departing midrib at 50-65° angle, ascending ± straight or slightly arcuate to near the margin, prominently and convexly raised above, less so below; tertiary veins scarcely visible above, slightly darker than surface below, prominulous and raised on both surfaces when dried; reticulate veins not visible below when fresh, weakly visible when dried; collective vein arising from near the apex, less prominent than primary lateral veins, 5-10 mm from margin. INFLORESCENCES arching-erect to spreading; peduncle 30-75 cm long, 5-9 mm diam., 2-4.4(11) x as long as petiole, green, sometimes purple-speckled, usually subterete, sometimes 1-ribbed; spathe reflexed, subcoriaceous, green tinged with violet-purple, narrowly oblong-ovate or oblong-elliptic 5.5-14 cm long, 1.4-3.5 cm wide, inserted at 10-70° angle on peduncle, gradually to abruptly acuminate at apex, acute to obtuse at base; spadix dark purple-violet (B & K red-purple 2/5), sometimes green tinged purple-violet, sessile or subsessile, subcylindroid or weakly tapered, 5.5-16 cm long, 7-9(12) mm diam. near base, 5-7(9) mm diam. near apex; flowers rhombic, 2-3.3 mm long, 2.4-3.5 mm wide, the sides ± straight parallel to spiral, sigmoid perpendicular to spiral; 5-9 flowers visible in principal spiral, (3)6- 10 in alternate spiral; tepals matte to semiglossy weakly to conspicuously and densely punctate, forming large nectar droplets on surface at anthesis; lateral tepals 2-2.3 mm wide, the inner margins straight; pistils weakly emergent, green tinged with violet-purple; stigma broadly ellipsoid, 0.5-0.6 mm long, brush-like, droplets appearing 5-8 days before stamens emerge; stamens emerging rapidly in a scattered pattern throughout, sometimes those at apex emerging first, held barely above level of the tepals, sometimes erect when dried; anthers purplish brown to purple-violet, 0.8- 1 mm long, 0.8-1.1 mm wide, in a tight cluster obscuring pistil; thecae oblong-ellipsoid, ± divaricate; pollen purplish (B & K purple 6/10). INFRUCTESCENCE pendent; spathe persisting at least in early fruit; spadix to 30 cm long, 2.5 cm diam.; berries red, obovoid, 7-8 mm long, ca. 5 mm diam.; pericarp with numerous raphide cells; mesocarp transparent, gelatinous; seeds 2 per berry, white, oblong-ellipsoid, ca. 4 mm long, ca. 1.3 mm diam.