THE VEGETATION OF THE JUAN FERNANDEZ ISLANDS 



949 



Polystichum berterianurn i. between 



stones 

 Scirpus nodosus I 

 Sonchus oleraceus i 



II: I 



Oxalis corniculata 2 



Adiantum chiknse i between stones 



Aira caryophyllea i 

 Galinsoga parviflora i 

 Rumex acetosella i 

 Silene gallica i 

 Spergularia confertiflora I 

 Wahlenbergia Masafuerae i 



89. In addition I give a list of the weeds noted in the vicinity of the aban- 

 doned settlement in Ouebrada de las Casas, ?'eb. — March 1917. 



Acaena argentea, Aira caryophyllea. Anethum graveolens. Anthemis cotula, Bromus 

 unioloides. Centaurea melitensis, Cerastium caespitosum, C. glomeratum, Cestrum parqui, 

 Chenopodium ambrosioides, Cichorium intybus. Cotula australis. Erigeron canadensis. Gnapha- 

 lium spicatum and stachydifolium, Hordeum murinum, Marrubium vulgare, Matthiola incana, 

 Medicago denticulata and sativa. Melilotus indicus. Melissa officinalis. Mentha pulegium, 

 Oenothera mollissima. Oxalis corniculata. Physalis peruviana, Raphanus sativus. Rumex acetosella, 

 conglomeratus. crispus and pulcher. Senecio vulgaris. Silene gallica, Silybum marianum. Solanum 

 argenteum, Sonchus oleraceus. Stellaria media. Taraxacum fernandezianum. Trifolium repens. 

 Verbascum virgatum, \'erbena litoralis. 



This is b\' no means a complete list of all introduced specie? found on the 

 island. 



The J^egetation of the sea-shore. 



The short description of the geography of Masafuera (p. 926) shows that the 

 conditions for the development of littoral plant communities are very much better 



here than on Masatierra. The accumulation of talus material along the coast 

 has been considerable: it is coarse and consists of stones of all sizes, and even 

 if the surf washes out most of the finer particles and there is little chance for 

 a salt-meadow to become established, some soil is left between the stones, where 

 colonists have gained a foot-hold. Small caves of the same kind as on Masa- 

 tierra are also found. The basalt rock is hard and generally more or less covered 

 with crustaceous lichens. 



90. 1 14 H.' Colonists on the coast rocks on both sides of the entrance to 

 the Casas valley, 102 1917. 



II: 3-2 

 Bahia ambrosioides, locally abundant 

 Libert la formosa 



11:2 

 Adiantum chilense 



Asplenium obliqiium v. cJwndrophyllum 

 Bromus unioloides 

 Cypents eragrostis 

 Polystichum berterianutn 

 Pteris berteroana 



Ruta chalepensis 

 Scirpus nodosus 



II; I 

 Blechnum aunculatum 

 Erigeron rupicola 

 Lobelia a lata v. rupincola 

 Pel lata chilensis 

 spergularia confertiflora 

 » masafuerana 



Tetragonia expansa 

 Wahlenbergia Masafuerae 



91. (14 I.) Adiantum chilense-^oQ\2i\\on. Small cave near landing-place, Oue- 

 brada de las Casas, 102 1917. Plate 116:2. 



