C. SKOTTSBERG 



Masafuera 13 (28.3 %), on Masatierra and Masafuera 11 (23.9 %), and on all three 

 islands 3 (6.5 %). However, several of the species restricted to Masatierra are, 

 perhaps, not truly indigenous, whereas the indigenous character of the species 

 only recorded from Masafuera cannot be doubted; 11 of them are mountain plants. 

 With regard to the former, some were commented upon by Joiiow. In his table 

 "Continjente B, I^^species autoctonas, pero no endemicas", pp. 221-222, he men- 

 tions several species regarded as doubtful natives: 3 species of Gnaphaihwi, Mimu- 

 liis, Solanum furcatian ( = robinsonianum), Tetragonia cxpansa, Spergularia rubra 

 (= confertiflora), Parietaria )iuiuifusa\ Trisetum c/iroifwstachyum and DantJioiiia 

 colliiia. With the exception of GnapJialiian spp. I have listed them as native. 

 There seems to be little reason to regard Tetrago7iia, a wide-spread thalassocho- 

 rous plant, as anthropochorous, and the Spergularia is known only from Juan 

 Fernandez and Desventuradas Is. Danthoiiia gave me the impression of being 

 just as autochthonous as PiptocJiactiuin and the two species of Stipa, and I find no 

 good reason to exclude either Mimulus, Parietaria or Trisetum (this never seen 

 by us). With regard to Solanum "'furcatimi' (not furcatum of Dunal) I share 

 Joi row's doubts. It was described by BlTTER as vS*. robi^isonianum, a Morella micro- 

 species of 5. nigrum L. coll. and found on all three islands. This assemblage 

 as represented on the mainland has never been seriously studied. Possibly vS". robifi- 

 sonianum is a case of the same kind as the dandelion discovered on the islands 

 in 19 1 7 and described as Taraxaaim ferna7idezianum Dahlst., a microspecies of 

 the Eurasiatic Vulgaria. There cannot be the slightest doubt that it is an alien 

 introduced from Chile, where these weeds have not been studied. From JOIlOW's 

 list I have excluded Bahia, Amblyopappus, Erythraea, Monocosmia and Phalaris. 

 Further, some species not recorded from Juan Fernandez by JOHOW or earlier 

 authors, but for the time being listed as native by me, are under strong suspi- 

 cion: J uncus capillaceus and pla7iifolius, Ce7itella and Hedyotis, perhaps also Paro- 

 7iycJiia. If, in the future, we shall be able to purify the list, the percentage of 

 endemic species will rise to 72 % or even more. 



The genera richest in species are Erigero7i with 6, yu7icus, Robi7iso7iia, U7ici- 

 7iia and \Vakle7ibergia with 5, and De7idroseris and Pepero77iia with 4 species each; 

 eight genera have 3, 15 two, and 59 only one species. The average number of 

 species to a genus is 1.65. 



The systematical position of the endemites and the distribution of the genera and 



species also found elsewhere. 



Gramineae. 



Stipa L. About 250 sp. (Bkws), widespread both hemisph., subtrop.-temp. 



7ieesia7ia Trin. et Rupr. Mcx. to Boliv. and Chile, Braz., Argent., Urug. Poly- 

 morphous (^^p. 771). 



Iae?rissi7na (Phil.) Speg. Peru, Chile, Argent. With a number of S. Amer. sp. 

 referred to a separate genus [Xassella). 



