Cynanchum boudieri

Description

Roots tuberous,10-50 × 1-4 cm.Stems twining to 5 m,puberulent.Leaves opposite;petiole ca.5 cm,with adaxial glands;leaf blade broadly ovate to ovate-oblong,4- >18 × 4-11.5(-17) cm,membranous,adaxially puberulent,base cordate,basal lobes mostly recurved,sometimes incurved,rarely overlapping,apex short acuminate;lateral veins 5 or 6 pairs.Inflorescences racemelike,to 30-flowered;peduncle 6-10 cm.Pedicel ca.1.5 cm,puberulent.Sepals ovate-oblong,ciliate,pubescent.Corolla white,to 1 cm;tube short;lobes oblong,(3-)3.5-6 × 1.5-1.7 mm,strongly reflexed after anthesis,pilose inside.Corona very deeply 5-lobed;lobes elliptic,fleshy,obtuse,up to 2 × as high as gynostegium,with narrowly triangular adaxial appendages;pollinia oblong.Stigma head conical,apex 2-cleft.Follicles lanceolate in outline,8-11 cm × 8-10 mm,with 2 longitudinal ridges.Seeds ovate-elliptic.Fl.