Macropsychanthus subg. Platylobium (Benth.) L.P. Queiroz

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

4.2. Macropsychanthus subg. Platylobium (Benth.) L.P. Queiroz

Dioclea sect. Platylobium Benth., Fl. Bras. 15(1): 164. 1859.

Dioclea sect. Macrocarpon Amshoff, Meded. Bot. Mus. Herb. Rijks Univ. Utrecht 52: 68. 1939. Type [designated by Maxwell, 2011]: Dioclea macrocarpa Huber.

Dioclea subg. Platylobium (Benth.) R.H. Maxwell, Novon 21(2): 232, 2011. Type: based on Dioclea sect. Platylobium Benth.

Type.

[designated by Maxwell, 2011]: Dioclea bicolor Benth. Stipules basifixed, not prolonged below their insertion. Leaves estipellate. Fruit flat, compressed and elastically dehiscent, with twisting woody valves, rarely indehiscent or passively dehiscent and turgid ( M. ruddiae ). Seeds with a short and oblong hilum (Fig. 3 G-J ).

This subgenus fits the circumscription of Dioclea subg. Platylobium (sensu Maxwell, 2011) with the transfer of Macropsycanthus huberi to the section Macropsycanthus .

Nine species are known from South America, centred in the Amazon and Guyana region and three species extend southward into the Cerrado biome in central Brazil.

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.