Macropsychanthus hexander (Ralph) L.P. Queiroz & Snak, 2020

Queiroz, Luciano Paganucci de & Snak, Cristiane, 2020, Revisiting the taxonomy of Dioclea and related genera (Leguminosae, Papilionoideae), with new generic circumscriptions, PhytoKeys 164, pp. 67-114 : 67

4.1.17. Macropsychanthus hexander (Ralph) L.P. Queiroz & Snak comb. nov.

Basionym: Mucuna hexandra Ralph, IC. Carp., 30, t. 34, f. 5. 1849. Type: The plate of Dolichos hexandrus Roxb. (nom. nud.), Ic. 2328 (holotype K [available at Kew 2006, http://apps.kew.org/floraindica/displayImages.do?index=6]).

Dolichos coriaceus Graham ex Wall., Numer. List [Wallich] n. 5562. 1831, nom. inval. (nom. nud.). Type: Singapore, Penang, Wallich Cat. no. 5562 (holotype: K! [001121297]).

Dioclea coriacea (Graham ex Wall.) Rusby, Mem. Torrey Bot. Club 3(3): 22. 1893. Type: based on Dolichos coriaceus Graham ex Wall.

Macropsychanthus novo-guineensis Pulle, Nova Guinea 8: 382. 1910. Type: Indonesia, Irian Jaya, Versteeg 1028 (lectotype, designated here amongst the syntypes: L! [0018939]; isolectotypes: BO, U! [1248394]).

Dioclea hexandra (Ralph) Mabb., Taxon 29(5-6): 605-606, 1980. Type: based on Mucuna hexandra Ralph.

Note.

Adema (1998) considered that plate 5 of Parrana rubra Rumph. in Rumphius (1747) should be taken as the type of Mucuna hexandra Ralph. In our opinion, the illustration of Parrana rubra does not provide sufficient elements to allow associating it with Macropsychanthus hexander (or with any species of Macropsychanthus ). When publishing Mucuna hexandra , Ralph (1849) illustrated the fruit and explicitly stated that he took the drawing from the unpublished painting of Dolichos hexandrus in Roxburgh icon 2328 that fits quite well with the diagnostic features of Mucuna hexandra , including the androecium with six fertile stamens (Fig. 5 ). We thus consider the original Roxburgh figure as the holotype of the basionym.

Figures

Figure 5. Original painting of Roxburgh icon 2328 (K) from Dolichos hexandrus that was used by Ralph (1849) to propose Mucuna hexandra Ralph. Note the androecium with six fertile stamens typical of Macropsychanthus hexander (Ralph) L. P. Queiroz & Snak. Available Roxburgh's Flora Indica (Kew 2006) at http: // apps. kew. org / floraindica / displayImages. do? index = 6.