Araceae
Aglaonema costatum N.E.Br.
SUMMARY
Small to medium, solitary to clump-forming, evergreen herb, to 35 cm tall. Stem repent and often branching, 0.6–1.3 cm thick. Leaves several together, often dense, each subtended by a pale green cataphyll that soon deliquesces; petioles 5–19 cm long; petiolar sheath very short, ca 1.5 cm long, open; leaf blade ovate, rarely lanceolate, 9.5–26 × 4.7–10 cm, base unequal, subcordate to rounded, apex acute to abruptly acuminate, apiculate, usually variegated with scattered spots on both sides of the leaf and/or with a white midrib, rarely not variegated; primary lateral veins 7–15 per side, diverging from midrib at 50°–70°; interprimaries barely differentiated. Inflorescence solitary; peduncle 2.5–23 cm; spathe ovate, apiculate, spreading at staminate anthesis, then closing, 2.2–5 cm, decurrent for 0.5–3 cm, white at anthesis, later marcescent during fruit development; spadix ellipsoidal-cylindrical, 1.8–3.5 × ca 1 cm, stipitate, stipe 0.2–0.6 cm; pistillate flower zone 0.2–0.5 cm, with 6–13 flowers; staminate flower zone 1.5–3.3 × 0.5–0.8 cm, white. Fruits bluntly ellipsoidal, 1–2 × 0.5–1.0 cm, ripening deep red.