THUJA. HAWTHORN 



277 



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

 (i) First leaf trifid, hairy. 

 Ct'atcegus Oxyacantha. Hawthorn (Fig. 153). 



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



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



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

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

 156). Prunus insititia, Bullace. Prunus domestica, 

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

 and other sjaecies. [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.] 



