What is "pentarrhinum"

Pentarrhinum is a genus of plants in the family Apocynaceae, first described as a genus in 1838. It is native to Africa.

1. Pentarrhinum abyssinicum Decne. - E + C + S Africa
2. Pentarrhinum balense (Liede) Liede - Ethiopia
3. Pentarrhinum coriaceum Schltr. - KwaZulu-Natal
4. Pentarrhinum gonoloboides (Schltr.) Liede - Tanzania
5. Pentarrhinum insipidum E.Mey. - South Africa
6. Pentarrhinum ledermannii (Schltr.) Goyder & Liede - Burundi
7. Pentarrhinum somaliense (N.E. Br.) Liede - Somalia

moved to other genera ( Pentatropis, Tylophora)

1. Pentarrhinum fasciculatum K.Schum., synonym of Pentatropis nivalis (J.F.Gmel.) D.V.Field & J.R.I.Wood
2. Pentarrhinum iringense Markgr., synonym of Tylophora iringensis (Markgr.) Goyder