Flora of the Hawaiian Islands
Dicotyledon Literature for Ricinus communis
Lorence & Wagner, 2020.
   Euphorbiaceae -- The Spurge Family Bibliography
      Ricinus communis

Common name(s): castor bean, ka`apeha, kamakou, koli, la`au `aila, pa`aila
General Information
DistributionCultivated and naturalized worldwide in the tropics and subtropics.In the Hawaiian Islands, naturalized on Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.

Shrub or small tree, usually 2–4(–8) m tall, younger parts glaucous, whole plant often reddish or purplish; stems usually unbranched in proximal part and branched above, branches ascending, internodes hollow.
Leaves petiolate; blade (10–)30–60(–100) cm long, nearly as wide, margin serrate; petiole 20–40 cm; stipules connate, 2–3 cm.
Staminate flowers borne below the pistillate ones, on pedicel 5–17 mm long, calyx lobes 5–8 mm long, 3–5 mm wide, stamens 7–8 mm; pistillate flowers on pedicel 5–10 mm long, sepals ca. 5 mm, styles 2–5 mm.
Fruit subglobose, ellipsoid, or ovoid, 10–25 mm in diameter, spines to ca. 5 mm.
Seeds gray, silvery, or beige with darker mottling, 7–12 mm long.
2n = 10, 20.
Warren Wagner