Flora of the Hawaiian Islands
Dicotyledon Literature for Gossypium tomentosum
Wagner et al., 1990, 1999.
   Malvaceae -- The Cacao, Linden, Mallow Family Bibliography
      Gossypium tomentosum

Common name(s): cotton, Hawaiian cotton, huluhulu, ma`o
General Information
DistributionIn the Hawaiian Islands, endemic to Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe.

Click here for detailed USGS map by Jonathan Price
Shrubs 0.5-1.5 m tall, softly white tomentose.
Leaf blades wider than long, usually 3-10(-12) cm wide, 3-lobed or sometimes 5-lobed to about the middle, the lobes ovate, acute or subacuminate, midvein on lower surface with basal gland absent or obscure, stipules subulate, 0.5-0.8 cm long, caducous.
Flowers solitary or few in short cymes, pedicel nectaries absent; involucral bracts ovate, 15-25 mm long, dentate, with 5-9(-12) acute teeth; calyx erosely truncate, 7-9 mm long; petals bright yellow, without a maroon spot, fading greenish, 2-3.5(-4) cm long.
Capsules 3-celled, coriaceous to woody, ovoid, cuspidate, 1.2-1.8 cm long, black-pitted.
Seeds 2-4 per cell, ca. 5 mm long, densely covered with reddish brown lint.
2n = 52*