58 MB. J. BALL OK THE FLORA 



atout Lima, where it is mucli valued for fodder, and has doubtless 

 beeu carried by accident to the upper part of the valley. 



OuTzoPSTS OESPITOSA, var. PEKUTiAKA, ^?o&. = JN'as sella csespi- 

 tosa, Griseh. 1?L Lorentz. 210, var. Common at Chicla and in 

 the upper valley of the Eimac ! This differs from the type in its 

 larger sizOj more lax inflorescence, and very short two-eared 

 ligule. It is in several respects intei^mediate between the Chilian 

 species of Nassella and the European Pi^tatliera^ which have all 

 been united under Orijzopsis by Bentham and Hooker. Grisebach 

 describes the awn as twice or thrice the length of the floret; in 

 his specimens, as in mine, I found it about four times as long. 



MuEiiLENEERGiA ? Upper valley of the Eimac, about 



9000 feet ! My specimens, which are only imperfect fragments, 

 are allied to M. ads^ersa, Trin., and _3/. clomena, Beauv., but 

 differ from both in the extreme shortness of the minute outer 

 glume . 



Agrostis jfANA, Kunth. Above Casapalta^ about MjSOO feet! 



PoLTPOGON iNTEURUPTUs, H. B. K, Upper valley of the 

 Eimae, about 9000 feet ! My specimens exhibit an unusually 

 large form of this species, which has a Avide range in South 

 America both in area and elevation. 



Chjetotropis a>'di>'a, n. sp. Chicla ! 



Csespitosa, multiculmis ; culmis subpedalibus, erectis, folioruin 

 vaginis la^vibus striatis vestitis ; foliorura lamina anguste lineari, 

 plana, propter marginem asperulum glaberrima, panicula breviore; 

 ligula bifida, oblonga, breviuscula ; panicula contracta, densa, sub- 

 lobata ; flosculis parvis ; glumis exterioribus sterilibus, subsequa- 

 libus, lanceolato-acuminatis, in carina scabriusculis, ca^terum gla- 

 berrimis, scariosis, saepius purpurascentibus; gluma fertili exteri- 

 oribus paullo breviore, sub lente pubescente, flosculum involvente, 

 infra medium arista dorsali ipsam glumam bis superanfce instructa, 

 extus ad basin pilis brevibus obliquis munita; rhachilla ultra 

 florem in setam brevissimam pilosam producta. 



It has been extremely diflScult to fix the true affinities of the 

 plant here described, but in all essential respects it agrees with 

 ChcBtotropis, of which the only known species appears to be rare 

 in Chili, but common in the island of Juan Fernandez. This has 



