English: Spiny arums; Swamp arums.
Clades:
Araceae;
Alismatales;
Liliidae;
Lilianae;
Angiospermae;
Plants.
Members: Lasia, Cyrtosperma, Dracontioides, Anaphyllopsis, Urospatha, Podolasia.
Regions: paleotropical; Africa, Asia, Malesia; some into the Neotropics.
Habitats: open marshes, deep freshwater swamps, muddy river banks; helophytes, amphibious plants; thrive in sunny or partly shaded, permanently saturated wetlands.
Content: High concentration of protective anatomical spines (prickles) alongside defensive chemical latex.
BotanyType: herbs; perennial; predominantly marsh-dwelling, helophytic (swamp-loving), or aquatic understory plants; typically robust and often armed with physical defenses.
Root: thick, creeping subterranean or underwater rhizomes; spiny; with strong anchoring root systems anchored in deep underwater mud.
Stems: usually modified into heavy, elongated, horizontal rhizomes; leaf stems (petioles) and the peduncles are notoriously armored with sharp, prominent prickles or spines.
Leaves: highly variable, dynamic, complex; juvenile leaves are often simple and sagittal, adult leaves develop into deeply pinnatifid (deeply lobed), divided, or sagittate-hastate (arrow-to-dagger) shapes; petioles are long, succulent, covered in sharp spines; venation is strongly reticulate (net-like).
Flowers: small; structurally bisexual (hermaphroditic); uniformly distributed across the entire length of a cylindrical spadix; 4 to 6 tepals; spadix is surrounded by a long, narrow, often dramatic spathe that frequently twists spirally at the tip and remains open only at the base.
Reproduction: sexually via specialized insect, small flies or beetles, attracted to the moist, protective chamber at the spathe base; asexually via slow creeping of the underwater rhizomes.
Fruits: berries; large; hard; green to dark red; leathery; often adapted for water dispersal (hydrochory).