Anthurium atropurpureum var. arenicola Croat

Terrestrial or epiphytic; stem to 30 cm long, 1-3.5 cm diam.; leaf scars obscured by root mass and cataphylls, 1.5-2 cm wide; roots numerous, dense, mostly descending, uppermost ascending, gray or green, smooth to densely pubescent, elongate, blunt, 5-30 cm long, 3-6 mm diam.; cataphylls moderately thin to subcoriaceous, bluntly 1-ribbed near the apex, 5-12 cm long, narrowly acute to acute at apex, tinged with red, drying tan (B & K yellow-red 7/2.5), persisting with apex remaining intact, eventually deciduous. LEAVES erect-spreading, rosulate or scattered along stem; petioles 4-63 cm long, 3-12 mm diam., erect, slightly thicker than broad to D-shaped, shallowly sulcate adaxially, sometimes obtusely V-sulcate, the margins moderately sharp, rounded abaxially, the surface pale-speckled, tinged with red near the base; geniculum markedly thicker than petiole, slightly paler, 1-3 cm long; blades coriaceous to subcoriaceous, narrowly to broadly oblanceolate, less often elliptic, acute to abruptly acuminate, sometimes gradually acuminate at apex (the acumen to 4 cm long, inrolled), long-attenuate or rarely acute at base, sometimes making geniculum seem remote, occasionally acute to obtuse, (16)45-80(100) cm long, 8-25(41) cm wide, broadest at or above the middle, the margins undulate; upper surface weakly glossy to glossy, medium green, lower surface semiglossy to matte, only slightly paler and mostly eglandular, rarely weakly pustulate, both surfaces drying green and paler below, matte; midrib flat at base, becoming acute-raised to convexly raised toward the apex above, higher than broad to prominently acute-raised below; primary lateral veins 5-13 per side, departing midrib at (30)40-65(70)° angle, usually weakly arcuate-ascending to the collective vein, sunken to convexly raised above, prominently and convexly raised below, paler than surface; interprimary veins etched above, weakly raised below, prominulous when dried; tertiary veins conspicuously etched above, flat to prominulous below; collective vein arising from about the middle or in the upper ? of blade, sometimes arising in lower 1/2,sunken above, raised below, flat above when dried; antimarginal vein visible on live plant, running close to margin from the base; 1st collective vein 9-12 mm from margin. INFLORESCENCES erect to spreading, shorter than or equalling leaves (rarely longer than leaves); peduncle (12)20-73 cm long, 2-8 mm diam., 1-4 x as long as petiole, green to green heavily tinged with purple, terete; spathe spreading to reflexed and recurled or twisted, withering at anthesis, subcoriaceous, matte on both surfaces, pale to medium green, heavily tinged with red-violet, sometimes maroon to purple, lanceolate to narrowly lanceolate, 4-22 cm long, 0.6-2.5 cm wide, broadest near the base, inserted at 45° angle on peduncle, long-acuminate at apex, broadly acute, decurrent to 2 cm at base, the margins meeting at ca. 45° angle; spadix green (B & K yellow 5/7.5) heavily tinged with violet-purple, to dark purple or maroon, cylindroid to tapered, sessile or stipitate to 16 mm, erect, 4-26 cm long, 3-8 mm diam. near base, 3-5 mm diam. near apex, broadest at the base; flowers square to rhombic, 1.5-2.6 mm long, 1- 2.5 mm wide, the sides straight to sigmoid, 5-8 flowers visible in principal spiral, 5- 10 in alternate spiral; tepals matte, weakly to densely and minutely papillate, muricate, lateral tepals (0.5)0.8-1 mm wide, the inner margins pale, thin, pinkish, straight to weakly convex, the outer margins 2-3-sided; pistils weakly emergent before stamens emerge, ± square, green, developing a maroon tinge, sometimes somewhat papillate; stigma ellipsoid, 0.2-0.6 mm long, depressed medially, lightly or densely papillate, droplets appearing 7-11 days before anthesis; stamens emerging in a regular sequence from the base, lateral stamens followed by alternates in rapid succession (7 days), the laterals preceding the alternates by 5-1 0 spirals, held over and obscuring pistil, 3rd barely preceding 4th; anthers yellow, 0.2-0.6 mm long, 0.8 mm wide, held at edge of the pistil, only partially exserted; thecae oblong-ellipsoid, 0.2-0.4 mm wide, not divaricate or only slightly divaricate; pollen yellow fading to cream, faintly sweet- or yeasty-scented. INFRUCTESCENCE spreading to pendent; spathe withered or absent; spadix 14-35 cm long, 1-2.5 cm diam., bearing berries in the basal portion only, the stipe to 1.5 cm long.; berries white to greenish white basally, violet-purple in apical 1/2 (B & K purple 2/7.5), subglobose, rounded at apex, 6-8 mm long, 4-6 mm diam.; pericarp somewhat thickened, with raphide cells; mesocarp with raphides, thickly gelatinous; seeds 1-2 per berry, pale green becoming purple (B & K purple 3/2.5), oblong-ellipsoid, 3-6 mm long, 2-3 mm diam., 1.4-1.6 mm thick, with a basal mucilaginous appendage at radicle end.