36 PATAGONIAN EXPEDITIONS I BOTANY. 



POLYPOGON Desf. 



Macl., p. 181 : Polypogon elongatior H.B.K. Occurs in North Pata- 

 gonia, Territory of Neuquen. 



Add Polypogon interruptus H.B.K. var. crinitus (Trin.) Hack. (P. 

 crinitus Trin.). 



Culm erect simple, glabrous, nearly 30 cm. Leaves linear, scabrous ; 

 sheaths globose ; ligules obtuse, ovate. Panicles spike-like, 5 cm., inter- 

 rupted by spreading scabrid short branches. Glumes obtuse, subequal, 

 purplish awned by a long seta. Valvules half as long as glume, subequal, 

 the lower larger and awned, the upper smaller, and awnless. 



Orinoco (the type). S. Patagonia in the vicinity of the emporium of 

 Sta. Cruz, Lago Argentine and Lago Viedma; W. Patagonia, by Rio 

 Aysen ; NW. Patagonia, by Rio Manso. 



AGROSTIS L. 



A. ABERRANS Steud. Macl., p. 184. 

 Syn. A. flavidula Steud. 



A. aberrans and A . flavidula are represented by one specimen each in 

 Herbarium Stockholmiense emanating from W. Lechler Plantce Magel- 

 lanicce in which collection A. aberrans is numbered 1219 and A . flavidula 

 1225, the very same numbers referred to in Steudel's description of the 

 species Steud. Syn. Glum., I, pp. 421 and 422. Both species have 

 the same habit, which induced me to examine them more closely. 



The specimen of A. flavidula is a couple of straw-colored individuals, 

 evidently taken at the close of the vegetating season. That of A. aberrans 

 is a single one, in size and proportions analogous to the former, but with 

 fully open blades, whilst those of A. fiamdula are conduplicate. In addi- 

 tion there are two panicles of the very considerable length of 16 cm., the 

 same size that is given in the description. 



A. flavidula, Steudel says, has "valvulasolitaria." This does not tally 

 with the specimen examined by me, which must be taken to represent 

 Steudel's species. All flowers examined by me had a rounded, diminu- 

 tive palea (valvula superior). 



In Steudel's description of A. aberrans there is the following very inex- 

 plicit clause : "valvulis subaequalibus . . . (quandoque exteriore abbrevi- 

 ata)." My examination, however, of the specimen in question shows the 



