THUJA. HAWTHORN 



277 



(a) Cotyledons thick and fleshy, plano-convex. 



(i) First leaf trifid, hairy. 

 Cratcegus Oxyacantha. Hawthorn (Fig. 153). 



Fig. 152. Thuja occidentalis, Arbor Vitaa (E.D.). 



(ii) First leaf not lobed ; simple and serratulate. 



Prunus Padus, Bird Cherry (Fig. 154). Prunus 

 Mahaleb (Fig. 155). Prunus spinosa, Blackthorn (Fig. 

 156). Prunus insititia, Bullace. Prunus domestica, 

 Plum (Fig. 157). Pyrus Aria, White Beam (Fig. 158) 

 and other species. [See also Addendum p. 299.] 

 (b) Cotyledons herbaceous and flat. 



(i) Cotyledons cut into lobes, and not longer [For (ii) 

 than broad. see p. 280.] 



