Flora of the Hawaiian Islands
Dicotyledon Literature for Abutilon grandifolium
Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Malvaceae -- The Cacao, Linden, Mallow Family Bibliography
      Abutilon grandifolium

Common name(s): flowering maple, hairy abutilon, ma`o
General Information
DistributionA widespread tropical weed of New World origin, sometimes cultivated as an ornamental or for fiber.In the Hawaiian Islands, naturalized on Midway, Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.

Shrub or subshrub, 1‒2(‒3) m tall; stems, petioles, and pedicels stellate tomentose and pubescent with spreading, shiny, simple hairs to 5 mm long.
Leaves petiolate; blade ovate to orbicular, 8‒15(‒22) cm long, margin dentate, apex acuminate, base deeply cordate with lobes often overlapping; petiole 5‒10(‒15) cm long; stipules linear-subulate, 3.4‒8.7 mm long, 0.1–0.7 mm wide, pilose.
Inflorescences axillary, flowers solitary or 2‒6 in a naked cyme, exceeding the leaves, peduncle and pedicel to 10 cm long, articulate. Flowers with calyx 1.1‒1.5 cm long at anthesis, lobed to near base, accrescent and loosely surrounding the fruit; corolla cup-shaped to subrotate, petals yellow to yellowish orange, 1.2‒2(‒2.5) cm long, undulate dentate apically; staminal column 5‒8 mm long; style branches yellow, stigmas maroon.
Fruit dull brown or black, broadly urceolate-truncate, 11‒14 mm long, yellowish pubescent, mericarps usually 10, thin walled and somewhat inflated, short beaked.
Seeds usually 3‒6 per mericarp, blackish, reniform, 2‒3 mm long, sparsely pubescent.
2n = 42.
Nancy Khan