Perennial, glabrous shrubs; branches long, leaves alternate, simple, 5-15 cm long, oblong or lanceolate, acute or acuminate, glabrous; flowers 4-5 cm across, yellow, solitary or paired, shortly stalked on a woody, hooked peduncle, strongly fragrant; sepals-3, small, recurved; petals 6 (3+3), equal, incurved, yellowish green, glabrous, inner petals concave at base; stamens numerous, free, concealed by basal part of inner petals, filaments very short with dorsal anther cells; carpels indefinite, connate, ovaries obovate, oblong, odourous, style columnar; stigma oblong; ovule solitary; young carpels pubescent; fruit berry or baccate, large, green or ultimately yellow.