Flora of the Hawaiian Islands
Dicotyledon Literature for Thunbergia fragrans
Smith, 1991; Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Acanthaceae -- The Acanthus Family Bibliography
      Thunbergia fragrans

Common name(s): white thunbergia, sweet clock-vine
General Information
DistributionNative to India and Ceylon.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i. First collected On Kaua'i in 1916 (Forbes 611.K, BISH).
















HabitatCultivated in Hawai'i, now natrualized at least on Kaua'i, O'ahu, Maui, and Hawai'i, but probably on all of the main islands.
Habit
Herbaceous, scrambling or climbing vine with slender sinistrorsely twining stems.
Leaves
Leaves petiolate; blade hastate-ovate, 3‒10 cm long, 1.5‒5 cm wide, broadly obtuse to truncate at base, margin subentire, often with pair of large teeth toward base; petiole unwinged, 0.5‒7 cm long.
Flowers
Inflorescences a solitary flower, axillary, pedicellate, subtended by 2 lanceolate to ovate bracts 13‒15 mm long. Flowers with 15‒16 calyx lobes; corolla white, tube 2‒2.5 cm long, limb 4‒5.5 cm across.
Fruit
Fruit 2.2‒2.5 cm long, body subglobose-didymous, 0.5‒0.7 cm long, 1 cm wide, beak flat, 1.5‒1.7 cm long.
Seeds
Seeds 2‒4, lenticular, biconvex, 5‒6 mm long, 3 mm wide, brown, surface rugose.
Notes
Despite the specific epithet, flowers of this species are not noticeably fragrant at any time of day or night.
Contributor
David Lorence