GERMINATION OF TREES AND SHRUBS 



319 



Indons, especially the yoiino-er portioai of the stern, pubescent. 

 Leaves alternate, prominently veined, scattered hairs on upper 

 and lower surfaces. Stipules conspicuously serrate, small, green, 

 pubescent. First leaf coarsely dentate, dentations giandular 

 tipped. Second leaf oval, dentate, slig'htly lobed. scattered hairs 

 on lower surface, pubescent on margin, reticulately veined. 

 Third leaf similar; doulily serrate. Trichomes broad, larger ax 



Fig-. 83 Fig. 84 



Pig. 83.- — ^Seedling of tlie common, apple iPyrus malus), the root caulicle 

 two cotyledons, the lower small leaves and stip-ule on the first fully formed 

 leaf. Photographed by Photo. Section, F. E. Colburn. 



Pig. 8 4. — Comim/on red haw (Grataegus mollis) radicle, caulicle, the 

 fleshy opposite cotyledons, alternate coarsely toothed leaves. Photographed 

 by Photo. Section, P. E. Colburn. 



base, thin-walled, straight or slightly cui^ved. The margin oi 

 the leaf l>ears giandular teeth. These spring frcni a group of 

 colorless epidermal cells. A tibro-vascular bundle terminates in 

 the tooth. Seeds planted in out door seed bed fall of 1917, ger- 

 nnnated liy June 1, 1918, 5 per cent. 



