ROSACES 



501 



late, petiolate, hairy on both surfaces, ultimately glabrescent, sub- 

 coriaceous, deciduous ; stipules foliaceous, variable, lanceolate or 

 semi-ovate, acutely and more or less deeply serrate, with gland- 

 tipped serratures ; petioles very short. 



No. 1. Small, cuneate, trifid and 

 slightly serrate (in some specimens 

 oblanceolate, acute, and simply or 

 slightly doubly serrate). 



No. 2. Cuneate, trifid ; terminal 

 lobe doubly serrate ; lateral lobes 

 simply serrate. 



No. 3. Cuneate, trifid, and becom- 

 ing doubly serrate ; terminal lobe 

 again subtrifid. 



No. 4. Ovate-oblong, cuneate at 

 the base, lobulate and serrate. 



No. 5. Triangular-ovate, trifid or 

 almost tripartite, lobulate and serrate, 

 cuneate at the base. 



Ultimate leaves variable in dif- 

 ferent individuals, cuneate, trifid or 

 pinnatifid and few- or many-lobulate, 

 serrate. 



Crataegus mexicana, DC. 



Hypocotyl erect, terete, slender, 

 3-3'5 cm. above the soil. 



Cotyledons oblong-oval, with about 

 two alternate incurved nerves on each 

 side of the midrib, reticulate, thin, 

 horizontal, 1'3-1'5 cm. long, 7-8 mm. 

 wide. 



Stem erect, terete, woody ; 1st in- 

 ternode 9-10 mm. long ; 2nd, 3rd, and 

 4th very short. 



Leaves shortly petiolate, alternately 

 penninerved, nerves ascending, reticulate ; petioles very short or 

 almost none in the primary leaves ; stipules small in the seedling, 

 subulate, acute. 



Nos. 1 and 2. Oblong, acute, rather acutely, simply or doubly 

 serrate. 



Nos. 3 and 4. Oblong-elliptic, more or less cuneate at the base, 

 acute, acutely and doubly serrate. 



FIG. 825. 



Cotoneaster Simonsii 

 Nat. size. 



