Macropsychanthus Harms subg. Macropsychanthus

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. Macropsychanthus Harms subg. Macropsychanthus

Dioclea sect. Pachylobium Benth., Comm. Legum. Gen.: 69. 1837. Lectotype [designated here]: Dioclea violacea Mart. ex Benth.

Lepidamphora Zoll., Fl. Ned. Ind. 1(1): 217. 1855. Type: Lepidamphora volubilis Zoll. [= Macropsychanthus comosus (G. Mey.) L.P. Queiroz & Snak], nom. inval. pro syn.

Taurophtalmum Duchass. in Griesebach, Cat. Pl. Cub.: 76. 1886. Type: Taurophtalmum pulchrum Duchaiss. [= Macropsychanthus megacarpus (Rolfe) L.P. Queiroz & Snak], nom. inval. pro syn.

Luzonia Elmer, Leafl. Philipp. Bot. 1: 220. 1907. Type: Luzonia purpurea Elmer.

Dioclea subg. Pachylobium (Benth.) R.H. Maxwell, Novon 21(2): 234. 2011. Type: based on Dioclea sect. Pachylobium Benth.

Description.

Stipules medifixed, prolonged below their insertion. Leaves stipellate, stipels mostly setaceous. Fruit indehiscent or passively dehiscent, turgid, slightly compressed (elastically dehiscent with twisting woody valves only in M. huberi ). Seeds with a long and linear hilum encircling 1/2 to 4/5 of the seed’s circumference (Fig. 3A-F ).

The distribution of this section is the same as that of the genus. Species of subg. Macropsychanthus are typical rainforest elements, where they occur as high-climbing lianas over the tallest trees. Few species are found in the savannahs of central Brazil or in the seasonally-dry woodlands of South America.

Figures

Figure 3. Representatives of the clade B. Macropsychanthus subg. Macropsychanthus (A-F). Macropsychanthus grandiflorus (Mart. ex Benth.) L. P. Queiroz & Snak A flowering vine (from Queiroz 15227). Macropsychanthus marginatus (Benth.) L. P. Queiroz & Snak B mature fruit showing dehiscence through the lower suture only C one of the valves removed to show the seeds with a long linear hilum (arrow; from Queiroz 15225). Macropsychanthus edule (Kuhlm.) L. P. Queiroz & Snak D the indehiscent and fleshy fruit decahing to release the seeds (from Popovkin 1546). Macropsychanthus lauterbachii Harms var. lauterbachii E giant flowers with bluish petals (unvouchered). Macropsychanthus megacarpus (Rolfe) L. P. Queiroz & Snak F flower (from Queiroz 10135). Macropsychanthus subg. Platylobium (G-J). Macropsychanthus scabrus (Rich.) L. P. Queiroz & Snak G flowers (from Cardoso 2907). Macropsychanthus bicolor (Benth.) L. P. Queiroz & Snak H part of the pseudoracemous inflorescence I mature (left) and dehisced (right) fruits J seed, showing the short hilum (arrow; from Queiroz 15874). Photos A-C, F, H-J: L. P. Queiroz; D: A. Popovkin; E: A. D. Poulsen; G: D. Cardoso.