a b 2 c : < d* e 31 



b.2 3-5 in., narrow-ovoid, opening and discharging its seeds the year of 

 maturity; resin-ducts in leaves near surface. 



LOBLOLLY PINE (P. Taeda). 



g 8-15 in., resin-ducts not near surface; cones cylindrical-ovoid, 6-10 in. 

 long, breaking away from branch within its b. 



LONG-LEAF PINE (P. palustris). 

 fs Both 2 and 3 each; Rocky Mountain trees. 



ROCK PINE (P. ponder osa scoputorum). 

 f 4 5 each, slender, 3-5 in.; cones 4-6 in., curved-cylindrical, with stems. 



WHITE PINE JP. Strobus). 

 e2 Deciduous, soft, short and in fascicles of many each (scattered on shoots of 



the season) TAMARACK (Larix Americana). 



a 2 COMPOUND LiEAVKS; 

 b Piimately compound, 

 c ALTERNATE AND 

 d Entire; 



e Leaflets 3, subsessile, obovate-oblong, remotely crenate-serrate; fr. samara. 



HOP-TREE (Ptelea trifoliata) . 

 e 2 Leaflets 7-9, short-stemmed, ovate to suborbicular and alternately arranged; 



fr. pod YELLOW WOOD (Cladrastis luted) . 



es Leaflets 9-13, short-stemmed, ovate-oblong, abruptly acuminate; fr. shining 

 white drupelet POISON SUMACH (Rhus vernix) . 



