THE ECOLOGY OF SAND DUNE PLANTS 205 



Quadrat No. 4 



Near summit, windward slope on slightly protected side of a ridge 



Abronia umbellala 26 



• Eriogonum parvifolium 17 



Liipinus Cliamissonis 12 



Cherianthus suffrutescens 3 



Gaertneria hipinalifida 2 



Phacelia Douglasii 1 



Adenosloma fasciculatum 1 



Lotus Junceus 1 



Sphaerostigma viridescens 1 



Quadrat No. 5 



Summit of dune 



Adenostovia fasciculatum 26 



Cherianthus s-uffrutescens 23 



Abronia umbellata 22 



Eriogoiium parvifolium 17 



Lupinus Chamissonis 5 



Lotus Junceus 2 



Sphaerostigma viridescens 2 



Eremocarpus setigerus 2 



Phacelia Douglasii 2 



Quadrat No. 6 



Just below summit of dune on leeward slope 



Cherianthus suffrutescens 29 



Adenostoma fasciculatum 21 



Eriogonum parvifolium 13 



Lupinus Chamissonis 6 



Phacelia Douglasii * 5 



Abronia umbellata 5 



Ramona stachyoides 5 



Quadrat No. 7 



Foot of leeward slope 



Lupinus Chamissonis 20 



Gnaphalium chilense , 7 



Cherianthus suffrutescens 6 



It is seen that the dominant plant in the first three quadrats is 

 Gaertneria, which is the pioneer plant to encroach on moving sand. 

 It establishes itself and is followed by Abronia umbellata in more 

 or less protected places. As Abronia umbellata is secondary in 



