SCHOMBURGK’S GUIANA PLANTS, 65 
173. Amphymenium Rohrii, H: B. K. Nov. Gen. et Sp. II. p. 
380.— Pterocarpus Rohrii, Vahl, DC. Prodr. 1l. p. 418.—Phel- 
locarpus floridus, Benth. in Ann. Mus. Vind. II. p. 106.— Falls 
of the Essequibo, British Guiana. Schomburgk, n. 34. 
Demerara, Parker. French Guiana, Martin. Woods on the 
Rio Madeira near Borba in Brazil. Herb. Mus. Petrop.— 
Pará. Sieber. On the Amazon River, Póppig.—Amongst the 
numerous specimens I have seen, mostly without fruit, it is 
possible there may be more than one species; but at present 
I have not materials to distinguish them. 
From not having seen the fruit, I had referred three plants 
tothe genus Phellocarpus, which are probably all Amphymenia: 
Ist. my P. floridus quoted above; 2d. P. acutus, which I have 
not since met with; and 3d. my P. laxiflorus from Rio Janeiro, 
which is Pterocarpus ( Amphymenium) violaceus, Vog. Linnea. 
Xl. p. 416. The latter species cannot, however, retain 
Vogel’s specific name, as the flowers are yellow, not violet; 
nor can it be Aublet's Acouroa violacea, which latter appears 
to me to bean Ecastaphyllum. The Rio plant may therefore 
take the name of Amphymenium laxiflorum. — — 
174. Centrolobium robustum, Mart.— Benth. Ann. Mus. Vind. 
II. p. 95.— British Guiana. Schomburgk (a few pods only). 
Near Rio Janeiro, Martius. Ubatuba, province of St Paul. 
Guillemin. 
Having now examined complete specimens of this and 
another new species, I here subjoin their ionic and de 
Characters. cad 
CExTROoLoBIUM.. Calyx initis aiig tu apu- 
nulatus, fere ad medium 4-fidus, lacinia suprema latioreintegra 
 Velemarginata. Petala subequilonga; vexillum orbiculatum, 
reflexum; alae falcato-oblonge; petala carinalia alis subcon- 
formia, apice dorso connata. Stamina monadelpha, vagina 
‘Supra fissa, vexillare basi liberum. Ovariumsessile, oblongum, 
_ obtusum, villosum, 2—(aut 3-?) ovulatum, ovulis amphitropis. - 
: Stylus lateralis, incurvus, hispidus, subulatus. Stigma minu- C 
tum terminale, Legumen subsessile, ovatum v. globosum, 
Spinis obtectum, sutura vexillari brevi nuda apice yle 
Vol. II.—No. 10. K x: 
