Heterostemma oblongifolium Costantin (1912: 120)

Rodda, Michele, 2016, Checklist and typification of Heterostemma (Apocynaceae, Asclepiadoideae, Ceropegieae), Phytotaxa 263 (1), pp. 1-17 : 10

Heterostemma oblongifolium Costantin (1912: 120)

TYPE:— LAOS, Phon Thane, s.d., C.J Spire 31 (lectotype P [P00645990], here designated, isotype P [P00645989])

= Heterostemma venosum C.Y.Wu nom . nud. (name annotated on specimen KUN0267875 and others)

Notes: —Specimens of H. oblongifolium were indicated by Costantin (1912) as ‘ Laos: Phon-thane (Spire) Nom Vulg. Mak bouek pha ’. In P there are two specimen collected by Spire in Laos labelled as H. oblongifolium by Costantin. They are both fruiting. The first, [P00645989], does not bear any collection locality, while the second, [P00645990], was collected in Phon Thane and is annotated with the common name ‘Mak bouek pha’ This second specimen is matching the protologue and is therefore selected as lectotype of H. oblongifolium . A careful selection of a flowering epitype will be necessary for the correct application of the name.