CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 

 UNIVERSITY, NEW SERIES, No. XXXI. 



Presented by B. L Robinson, April 12, 1905. Received June 6, 1905. 



I. DESCRIPTIONS OF SPERMATOPHYTES FROM THE 



SOUTHWESTERN UNITED STATES, MEXICO, 



AND CENTRAL AMERICA. 



By J. M. Greenman. 



Tradescaxtia fluminensis, Veil. Fl. Flutn. 140, t. 152 (1790); 

 C. G. Clarke in DC. Monogr. iii. 294. Specimens of this white-flowered 

 South American species were secured by Senor Professor A. Duges in 

 the vicinity of Guanajuato, Mexico, 1904, no. 3 (hb. Gr.). According to 

 Professor Duges the plant is not cultivated there, but is found growing 

 wild in moist shady places about the city of Guanajuato, although it is 

 rare. The species does not seem to have been recorded hitherto from 

 Mexico. 



Hymenocallis riparia, n. sp. Leaves lorate, 2 to 6 dm.- long, 7 to 

 14 mm. broad, entire, bordered with a narrow whitish subcartilaginous 

 margin, glabrous, their bases expanded, persistent and forming a mem- 

 branous collar 10 to 12 cm. in length : peduncle 3 to 3.5 dm. long, flat- 

 tened : spathe-valves 2, lance-attenuate, 3.5 to 6 cm. long, thin and 

 scarious : flowers 3 to 7, sessile : perianth white ; tube of the perianth 8 

 to 12 cm. in length ; divisions of the perianth nearly or quite equalling 

 the length of the tube, 3 to 5 mm. in breadth, 5-7-nerved : staminal cup 

 broad-funnelform, 2 to 2.5 cm. high, subentire ; free portion of the fila- 

 ments 5 to 6 cm. long, slightly broadened at the base, gradually tapering 

 to the 1.5 cm. long verticillate anther, greenish : style much elongated, 

 greenish ; stigma overtopping the anthers : ovar}' sessile, bearing 3 to 7 

 ovules in each cell, these ascending from the lower inner angle »of the 

 cell and sometimes subsuperposed. — Mexico. State of Morelos : by 

 streams near Cuernavaca, 11 November, 1895, C. G. Pringle, no. 5979 

 (hb. Gr.), and in the same locality, 27 July, 1896 C. G. Pringle, no. 

 7204 (hb. Gr.) ; rocky river banks, barranca of Cuernavaca, altitude 



