16 (15) Trees with stiff horizontal branch- 

 es; leaves simple, obovate to el- 

 liptic and entire; fruit an elongate 

 drupe to 1.5 cm long, purple, on a 

 long peduncle (3-6.5 cm) ; foliage 



scarlet early in the fall Nyssa sylvatica, 



Sour Gum 



Figure 14.- 



-Leaf XI. 



16 (15) Trees with usual branching, leaves simple, serrulate 17 



17 (16) Bark of twigs smooth, reddish brown to blackish gray, with conspicuous len- 



ticels (corky spots) ; bitter almond odor in bark; fruit a drupe (stone fruit). .Prunus. A 



A (17) Small trees, flowers and fruit in racemes B 



A (17) Small trees or shrublike growth 

 habit; on dunes and along 

 shores; flowers and fruit soli- 

 tary or clusters; leaves ovate 

 or oval, acute tip, pubescent be- 

 neath when mature; fruit a 

 plumlike drupe; stone pointed 

 at both ends Prunus maritima, 



Beach Plum 



Figure 15.— Leaf XI. 



B (A) Sepals deciduous; leaf blade obovate, thin, mostly serrulate with slender 



teeth, no villose hairs along midrib of the leaf. . . .Prunus virginiana, Choke Cherry 



B (A) Sepals persistent; leaf blade 

 elliptic or lanceolate, serrulate 

 with relatively coarse teeth, 

 sometimes villose hairs along 

 prominent midrib of the leaf 

 below Prunus serotina, 



Black Cherry 



Figure 16.— Leaf X % 



17 (16) Bark of older twigs grayish, lenticels not 

 conspicuous; leaves elliptic to ovate-oblong, 

 4-5 cm long; no bitter almond odor in bark; 



fruit a small pome (apple-like) Amelnnchier laevis, 



Shadbush (other members of genus may be 

 present) 



Figure 17.— Leaf XL 



