78 (76) Lower leaves long, petioled and 

 spatulate with pinnate serra- 

 tions, upper stem leaves sessile 

 and deeply pinnately toothed; 

 flowers a daisy; plants of sea 

 cliff's and dunes (also roadsides, 



etc.) Chrysanthemum leucanthemum, 



Ox-Eye Daisy 



Figure 81. — Leaves XI- 



78 {76) Lower leaves almost sessile, pinnately toothed, up- 

 per stem leaves linear; racemes of small white flow- 

 ers, followed by larger oval-shaped siliques; plants 



of dunes and waste places Lepidium virginicum, 



Peppergrass 



Fi^re 82. — Siliques and leaf XI 



79 (74) Plants with conspicuous stipules at each node in form of a sheath (ocreae) sub- 

 tending the leaf 



79 (74) Plants lacking conspicuous stipules at nodes 



80 

 81 



80 (79) Stipules ending in points; leaves whitish gray 

 or green linear-oblong, rugose on upper sur- 

 face; flowers white; clusters growing from 

 stipules at nodes; fruit a lustrous black achene, 

 exserted from floral envelope; plants of sea 



beaches and dune hollows Polygonum glaucum, 



Seabeach Knotweed 



Figure 83. — Stem and node with stipule, 

 Leaf and flower X2%. 



34 



