THE PHANEROGAMS OF THE JUAN FERNANDEZ ISLANDS 



Trisetum Pers. 



8. T. chromostachyum Desv. — JOHOW, Estud. 137. 



Masatierra: Germain! Reed! -- In my previous paper on the islands I 

 excluded this from the list of indigenous species. There are, however, no special 

 reasons to regard it as introduced. It must be rare, and we never found it. 



Area of distribution: Central and South Chile; Masatierra. 



Danthonia DC. 



9. D. collina Phil. — Joiiow, Estud. 138. — Fig. 2 a. 



Masatierra: PlIILIPPl! — Dry rocky ridges and sunny arid slopes; the 

 peak between Pangal and V. Colonial, 365 m (past fl. 17 /i2 16, no. 148); Q. Dama- 

 juana (fl. 6 /i2 16, no. 52); C. Salsipuedes, dry, wind-exposed rocks, not uncom- 

 mon; Pto Ingles (fr. dispersed, 19 /i 17, no. 328); Villagra, frequent on the dry 

 slopes (Skottsberg 1908; fl.-fr. 6 /i 17, no. 247). 



First found by PHILIPPI and rediscovered (sterile) by the writer in 1908. 

 As there are so many American species of this genus I have thought it better 

 to add a few figures for comparison. 



Area of distribution: South Chile (Valdivia); Masatierra. 



Koeleria Pers. 



10. K. micrathera (Desv.) Griseb. Symb. Fl. Argent. 292. — Syn. Trise- 

 tum micratherum Desv. ex Gay, Bot. VI. 352; T. laxnm Phil. Anal. Univ. 

 XLIII.568, JOHOW, Estud. 137; PlLGER, Uber einige Gram. 387. — Fig. 2 b — h. 



Masatierra: Philippi! — Rocky places near Portezuelo de Villagra, in 

 brushwood c. 590 m, very scarce (fl. 10 /i 17, no. 279). 



I have not seen the type of Trisetum micratherum, to which T. laxum is 

 referred on the authority of Prof. Pilger; according to the description the 

 former has much shorter leaves (only 2—3 inches), pubescent sheaths, outer 

 glume 2 /z as long as the inner, etc., but these differences disappear, it seems, 

 at a closer look, for Pilger writes 1. c. 388: »Die Skottsbergschen Exemplare 

 stimmen mit denen von Valdivia durchaus uberein». If the plant from Argentina 

 belongs here is an open question. 



In his monograph of Koeleria, Bibl. Bot. 65, DOMIN calls K. micrathcra 

 a rmixtum compositum». He had seen Philippi's specimens from Valdivia and 

 concludes that they must belong to some other genus. His reason for excluding 

 it from Koeleria evidently is that, as it is perennial and caespitose, it belongs 

 to the subgenus Airochloa, but all the Airochloas have much larger anthers. 

 The annual Lophochloa species have smaller anthers. Thus, it takes an inter- 

 mediate position. There is no other genus where we could find a suitable 

 place for it, and a new genus could not very well be based only on the small 

 size of the anthers. 



