An erect, green perennial under shrub, 15-45 cm. (rarely 90cm) high; tap root tuberous, soft, sometimes irregularly nodular; bark pale brown, corky with irregular longitudinal fissures; leaves in whorl of three, large, 7.5-17.5cm × 4.3-6.8 cm., elliptic-lanceolate or obavate, acute or acuminate...