PINACEAE. The Pine Family. 



Trees with a resinous juice-, leaves linear or scale-like, clus- 

 tered, or borne alternately on branches, mostly evergreen ; 

 fruit a dry cone, or sometimes a berry. A family with about 

 L'.'iO species distributed throughout the world, but confined 

 principally to t^mper.-Me regions. They are of great economic 

 importance as a source of resin, tar. turpentine and pitch as 

 well as for lumber and ornamental planting. 

 Leaves all needle-shaped. 



Leaves borne in clusters of two to five 1 Pinus. 



Leaves scattered on the stem. 



Leaves deciduous 2 Taxodium. 



Leaves evergreen 3 Pseudotsuga. 



Leaves scale-like and appressed to the stem, or 



some of them awl-shaped, spreading. 

 Fruit a small cone consisting of a few scales: 



Cones ovoid to oblong 4 Thuja. 



Cones globose 5 Chamecyparis. 



Fruit fleshy, berry-like. 



Leaves awl-shaped, spreading on mature 



branches, cones axillary 6 Juniperus. 



Leaves scale-like, appressed on mature 



branches, cones terminal 7 Sabinia. 



1. PINUS. The Pines. 



Monoecious, evergreen trees or rarely shrubs of great eco- 

 nomic importance. The leaves are borne in clusters of two 

 to five upon minute dwarf branches. The main stem pro- 

 du'-cs branches regularly in whorls \vhich decrease in length 

 towards its apex, thus giving the tree a conical appearance. 

 Flowers borne iu the spring: the fruit, a woody cone, not 

 ripening until the season following. The seeds are borne in 

 pairs at the base of the cone scales. 

 Leaves in 5's with a deciduous sheath at base, 



cone scales unarmed 1. P. flexilis. 



Leaves in bundles of three. 



Cones subterminal, cylindrical or conical 



oblong, slightly curved, armed with small 



reflexed prickles 2. P. palustris. 



Cones lateral, ovate-oblong, arme-d with short, 



stout prickles 3. P. taeda. 



:: Trees, s 



