510 CONTEIBUTIONS FKOM THE NATIONAL HERBARIUM. 



3. Machaerium setulosum Pittier, Contr. U. S. Nat. Herb. 20: 477. 1921. 

 Veracruz ; type from Zacuapan. 



Subscandent shrub ; leaflets numerous, 2 to 3.5 cm. long, with fine parallel 

 nerves, pubescent beneath ; flowers violet. 



4. Machaerium riparium T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 500. 1919. 

 Known only from the type locality, Zacuapan, Veracruz. 



Leaflets oblong or elliptic, about 3 cm. long, glabrous ; panicles ferruginous- 

 pubescent ; fruit glabrous, 6 cm. long, the wing 1.8 cm. wide. 

 The writer has seen no material of this species. 



53. PLATYMISCIUM Vog. Linnaea 11: 198. 1837. 

 Trees or shrubs ; leaves glabrous, estipellate. the leaflets few, opposite ; ra- 

 cemes borne on new or old branches, solitary or fasciculate ; corolla yellow, 

 glabrous ; fi-uit oblong, flat, submembranaceous, indehiscent. 



Leaflets 3; rachis of the racemes glabrous 1. P. trifoliolatum. 



Leaflets 5; rachis of the racemes finely puberulent 2. P. yucatanum. 



1. Platymiscium trifoliolatum Benth. Journ, Linn. Sec. Bot. 4: Suppl. 82. 1860. 

 Type collected between San Bias, Tepic, and Guadalajara, Jalisco. 



Leaflets ovate-elliptic, acuminate, acute at base ; racemes 7 to 13 cm. long, 

 the flowers long-pedicellate, 10 to 12 mm. long; young fruit about 3.5 cm. long 

 and 8 mm. wide. 



2. Platymiscium yucatanum Standi., sp. nov. 



Type from Izamal, Yucatan, flowering in February (Gaunter 377; U. S. Nat. 

 Herb. no. 571029). 



Tree, 24 meters high, the branchlets gray ; leaves glabrous, the petiole about 

 3 cm. long ; leaflets 5, ovate or ovate-oblong, 4 to 6 cm. long, 1.5 to 2.5 cm. wide, 

 obtusely acuminate, rounded or obtuse at base, coriaceous, lustrous, the venation 

 prominent and reticulate on both surfaces, the petiolules 5 to 6 mm. long; ra- 

 cemes fasciculate on old branchlets, 7.5 cm. long or less, lax. the rachis minutisly 

 puberulent ; pedicels 1 to 2.5 mm. long ; calyx 3 mm. long, minutely puberulent ; 

 standard petal about 7 mm. long. 



The tree has been reported ^ from Yucatan as Pterocarpus draco L. The 

 Maya name is given as " subinchg." 



54. ICHTHYOMETHIA P. Br. Civ. Nat. Hist. Jam. 296. 1756. 

 Reference : Blake, Revision of Ichthyomethia, a genus of plants used for 

 poisoning fish, Journ. Washington Acad. Sci. 9: 241-252. 1919. 



Trees or shrubs ; leaves pinnate, the leaflets opposite ; flowers in lateral 

 panicles, appearing befoi'e the leaves, pink or white and red ; fruit indehiscent, 

 broadly 2-winged on each suture. 1 to 6-seeded. ^ 



Leaflets very densely tomentose or soft-pilose beneath. 



Leaflets tomentose beneath 1. I. grandifolia. 



Leaflets short-pilose beneath 2. I. mollis. 



Leaflets strigose or puberulent beneath. 



Leaflets densely incurved-puberulent beneath, the hairs parallel with the 

 veinlets ; stipe of the fruit equaling or slightly exceeding the calyx. 



3. I. communis. 



Leaflets strigose beneath, the hairs crossing the veinlets transversely ; stipe 



nmch exceeding the calyx 4. I. americana. 



'Field Mus. Bot. 1: 368. 1898. 



