Oreopanax sanderianus Hemsl.

Oreopanax sanderianus Hemsl. Gard. Chron. III 11:718. 1892.
Tree to 15 m. high, or epiphytic shrub, the branchlets stout, terete, brownish, glabrous; leaves simple, glabrous, the petiole up to 40 cm. long, striate, the juvenile blade peltate, equally 3-lobed, up to 40 cm. in diameter, the lobes spreading, broadly deltoid, acute, entire at the margins, the mature blade variable, broadly ovate or deltoid, up to 27 cm. long and nearly as broad, rounded or cordate or truncate or shallowly peltate at the base, acute or gradually acuminate at the apex, entire at the margins (or the juvenile leaf-form sometimes persisting, the mature blade 3-lobed or rarely with an additional smaller pair of lobes at the base), the primary nerves 3 or 5, spreading from the base, prominent on both surfaces, the secondary nerves spreading; inflorescence up to 30 cm. long and broad, the branchlets and peduncles cinereous-puberulent, soon glabrous, the bracts ovate, 3-4 mm. long, the peduncles up to 5 mm. long; staminate heads 5-7 mm. in diameter, the bractlets few, small, deltoid, often connate, puberulent without or glabrous, the bracteoles inconspicuous, the flowers glabrous; calyx small, the limb membranous, somewhat undulate; petals oblong, 1.5-2 mm. long, often calyptrate; filaments short, the anthers less than 1 mm. long; styles 1 or 2, short; fruit-subtending bracts and bracteoles conspicuous, broadly ovate, up to 3 mm. long and 5 mm. broad; fruits few (2-5 per head), subglobose, 4-6 mm. in diameter, glabrous, the styles 5-7 (usually 6), free to the base, spreading, about 1 mm. long, the seeds 5-7 or fewer.
Type locality: Guatemala.
Distribution: Guatemala and southern Mexico (Chiapas), 600-2000 m., often abundant.

Oreopanax sanderianus is a species of plant in the family Araliaceae. It is found in Guatemala, Honduras, and Mexico. It is threatened by habitat loss.