Flora of the Hawaiian Islands
Dicotyledon Literature for Catharanthus roseus
Wagner et al. 1990, 1999..
   Apocynaceae -- The Dogbane, Milkweed Family Bibliography
      Catharanthus roseus

Common name(s): periwinkle, kihapai, Madagascar perwinkle
General Information
DistributionEndemic to Madagascar, now widely naturalized in tropical and subtropical areasIn the Hawaiian Islands, naturalized on Midway, Ni`ihau, Kaua`i, O`ahu, Moloka`i, Maui, Kaho`olawe, Hawai`i.

Suffrutescent herbs; stems 3-8 dm long, sparsely puberulent.
Leaves oblong elliptic to obovate, 3-5 cm long, 1.5-2.5 cm wide, margins entire, apex rounded, sometimes apiculate, base cuneate, petiole short, 3-10 mm long, with many glands at the axil.
Flowers paired; calyx lobes 5-7 mm long; corolla white or rose pink, often with a white, red, or yellow center, the tube 20-30 mm long, the lobes 15-27 mm long.
Follicles 1.5-2.5 cm long.
Seeds narrowly ellipsoid, 2 mm long, 1 mm in diameter, blackish, the surface wrinkled.
2n = 16, 24, 32.