33 

 Field Wn rk Jiil-- QQ. 1900. 



Life History nf a Crrnvii ns Bsar-.h Vegetation. 



Beach vegetation is usually Xerophytlc. The beach may be 

 divided into zones, lower beach, middle, upper, and mature or 

 fossil beach. 



The lower beach was characterized by the entire absence of 

 plant life. Plants ate \inable to adapt themselves to such 

 variations as growth on this xone wo\;ld expose them. Plants may 

 grow in water or -apon land since they need a certain stability. 

 The .beach shows a certain gradation in the plant life though no 

 strict line of demarcation can be drawn between the different zones. 



Next to the zone of the lower beach is that of anjiuai plants. 

 During certain seasons of the year the water rises more than at 

 others. Therefore plants which obtain a foothold there, must be 

 able to complete their life work within a short tiiae. The zone 

 of annuals along L.I. Sound corresponds to the same zone along 

 Lake Michigan. p]very species found in Chicago except the bug-seed, 

 is duplicated here. 



Plants in Zone of. Annuals. 



1. Cakile Americana, Sea-rocket. 



2. Xanthiiira, Cockl'eburr. 



3. ehenipodium album. Lamb's Qiiarters. 



4. Polygonium convolvulus. Bindweed. 



5. Oenothera, Evening Primrose. 



6. Salsola kali. Saltwort. 



