GERMINATION OF SHRUBS AND TREES 
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Fig. 6. Seedling of Prunus caroliniana 
Drawn by C. M. King 
Prunus caroliniana. Ait. Mock Orange. 
Seeds received from Dr. Morton, Greenville, South Carolina. 
Stratified out of doors in garden soil through the months of 
January and February, 1922 ; winter mild. Planted about March 
1 in greenhouse. Germinated April 1. 
Germination hypogaeous, seed remaining below the surface. 
Leaves alternate, first two small, 1/4 inch long, the following 
leaves increasing in size, light bright green. Leaves laurel-like, 
firm, entire. Petioles short. Stem reddish, slightly clothed with 
fine hairs. Hairs on petiole and scattered along margin of leaves. 
Rhus Toxicodendron. L. Poison Ivy. 
Seeds stratified out of doors. Planted in greenhouse February, 
1922. Cotyledons appeared March 28. 
The stem below, slightly reddish, broadly elliptical, about y 2 
inch in length, stalked ; slightly reddish above, lower surface paler 
and greener in color. Surface smooth, midrib prominent, lateral 
veins distinct. Leaves alternate, petioled, compound with three 
leaflets. 
The lateral leaflets with prominent dentate teeth, midrib con- 
spicuous, lateral veins prominent, smooth, lower surface pale, 
upper surface reddish. Second leaf like the first ; terminal leaf- 
let larger than the others, prominently dentate ; margins hairy ; 
stem slightly pubescent. 
Trichomes. On edges of leaves, small, colorless; on stem 
small, weak, colorless. 
Rhus canadensis. Marsh. 
Seeds collected at Salt Lake City, September, 1921, by L. H. 
