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

Common name(s): bur bush, Sacramento bur
General Information
DistributionNative to North America from Baja California and Mexico south to South America and the West Indies.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Maui, Hawai`i.

Perennial herbs or subshrubs to ca. 5-20 dm tall; stems erect, younger ones densely stellate pubescent, glabrate with age.
Leaves variable in shape, usually broadly ovate to lanceolate, 4-20 cm long, 3.5-8 cm wide, usually slightly 3-lobed, 3-nerved from base, stellate pubescent, more densely so on lower surface, margins irregularly serrate-dentate, apex acuminate, base very broadly cuneate to truncate, rarely subcordate, petioles 1.5-6 cm long.
Sepals linear, 4-7 mm long, apex with a filiform subapical appendage; petals yellow, narrowly oblanceolate, 3.5-6.5 mm long; stamens 15-20.
Capsules globose, indehiscent, 4-5 mm in diameter, puberulent, glabrate with age, covered with retrorsely setose, hooked bristles.
2n= 32