TROPICAL PLANT ENCYCLOPEDIA
Raphionacme longifolia
RaphionacmeFamily: Apocynaceae (Formerly:Asclepiadaceae)
Subfamily: Asclepiadoideae
Origin: South Africa
Small growing tuberous rooted vine. The flowers are greenish-purple. In cultivation the plants are usually grown in semi shade, with the tubers wholly or partially exposed to prevent scorching and rotting of the roots.
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Link to this plant:
https://toptropicals.com/catalog/uid/raphionacme_longifolia.htm