18 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.73 



irregularly sublobate. Texture coriaceous. Length about 5 centi- 

 meters. Maximum width about 3.5 centimeters. Midvein stout. 

 Secondaries 4 or 5 irregularly spaced pairs, diverging from the mid- 

 vein at varying angles, camptodrome. 



' The identity of this incomplete leaf is exceedingly problematical, 

 and it may possibly represent some member of the Bignoniaceae. 

 Both alternatives are represented in the existing flora of northern 

 Argentina. Hydrangea is an ancient genus, cosmopolitan in existing 

 floras and with several well-defined Tertiary species in the Northern 

 Hemisphere, represented in Patagonia by Hydram.gei'pliylluTn afjine 

 Dusen.^*' 



Occurrence. — One and one-half miles south of Mata Amarilla, 

 upper Rio Chalia, Territory of Santa Cruz. 



H oloty pe.—C^t. No. 37864, U.S.N.M. 



LEGUMINOSAE INCERTAE SEDIS 

 Genus LEGUMINOSITES Bowerbank 



LEGUMINOSITES CALLIANDRAFORMIS, new species 



Plate 3, Figures 13, 14 



This species is based upon the single specimen figured, obviously 

 representing a leaflet of some member of the alliance Leguminosae. 



Leaflet small, very inequilaterally obovate. Apex broadly rounded, 

 but slightly unsymmetrical. Base sessile, markedly inequilaterally 

 cuneate. Margin entire. Texture subcoriaceous. Length about 11 

 millimeters. Maximum width about 5 millimeters. Midvein stout, 

 much curved. Secondaries thin, ascending, curved, camptodrome; 

 three from the extreme base, a slender one inside the midvein, and 

 two coarser ones outside the midvein. 



This leaflet is much like those of the genus Galliandra Bentham, 

 which contains over 100 existing species, the majority in the warmer 

 parts of South America. Two fossil species have been described from 

 the Pliocene of Potosi, Bolivia. Since similarly veined leaflets occur 

 in Cassia, G aesalfinia, and other genera of this alliance, and since the 

 present material is so limited, it is referred to the form genus 

 Leguminosites. 



Occun^ence, — Canyon of Rio Nirihuao, 2i/^ leagues above its eni- 

 boucheur in the basin of Lago Nahuel Huapi, Territory of Rio Negro. 



Holotype.—Q2ii. No. 37865, U.S.N.M. 



" Dus^n, P., Svenska Exped. till Magellansland, vol. 1, No. 4, p. 102, pi. 10, fig. 5, 1899. 



