i8 



Plant Invasion on Lava Flows. 



cient quantity to be conspicuous from a distance. A longer search 

 would probably add quite a few more species to the list: 



FIUCES.3 



Asplenium praemorsum Sw. (As- 

 plenium furcatum i Thbg.) 



Asplenium trichomanes L,., var. 

 {Asplenium den sum Brack.) 



Diellia erecta (?) Brack. {Lind- 

 say a erecta Hook.) 



Doryopteris decora Brack. {Pteris 

 decora Hook.) 



Pellaea ternifolia (Cav.) Link. 

 Psilotuni nudum (L.) Griesb. 



{Psilotum triquetrum Svv.) 

 Polypodium pellucidum Klf. var. 



The folded form. 

 Sadie/ ia cyatheoides Klf. 



PHANEROGAMS. 



Cyperus sp. 



Amaranthus spinosus L,. 



Rumex giganteus Ait. 



O steom el es anthyl I idifol ia 



(Smith.) Lindl. 

 Me i bo m i a uncinata (Jack . ) 



Kuntz. 

 Oxalis corniculata I y . 

 Euphorbia pilulijera L,. 

 Sida eordifolia L,. 

 Waltheria americana L. 

 Opuntia tuna (L.) Mill. 

 Metrosideros polymorph a Gaud., 



var. 



Asclepias curassaviea L. 

 Ipomaea congesta R. Br. 

 Verbena bona hen sis L. 

 Plectranthus ausiralis R. Br. 

 Capsicum frute seen s L,. 

 Lycopersicum esculentum Mill. 

 Solatium nigrum L,. 

 Biden s p ilosa I, . 

 Erigeron canadensis L,. 

 (hiaphatium sp. 

 Sonchus oleraceus L. 

 Raillardia sp. 



Of the above, the most frequent species met with are Metrosi- 

 deros polymorpha, Polypodium pellucidum and Sadlcria cyatheoides. 

 With the exception of Metrosideros polymorpha, which is the pre- 

 vailing tree, these plants do not give a conspicuous aspect to the 

 flora in the immediate vicinity of the flow, but constitute what 

 might be classified as the weeds. Of the twenty-three phanero- 

 gams, sixteen belong to the naturalized flora and six to the native 

 flora, one of the latter being of wide distribution as a shore plant. 



3 These are the names recognized in Christensen's Index Filicum, but for 

 the convenience of local readers the names given in Hillebrand's Flora are 

 given in parentheses. 



