146 REPORT OF NEW JERSEY STATE MUSEUM. 



district, and the Old Field Pine of Cape May. The White Pine 

 and Hemlock are rare intrusions from the north, and the Pond 

 Pine and Cypress from the south. 



Key to the Species. 



a. Seeds broadly winged, born in a typical cone, leaves evergreen. 

 b. Leaves needle-like, two to five together in a sheath. 



c. Leaves in fives. Finns strobus, p. 146 



cc. Leaves in twos, short and somewhat twisted. 



P. virginiana, p. 147 

 ccc. Leaves in twos or threes, cone small, 25-50 mm. long, prickles 

 weak. P. echinata, p. 147 



cccc. Leaves in threes. 



d. .7-1.2 dm. long, cone large and heavy, 16 mm. long, prickles 



strong. 

 dd. 1.5-2.5 dm. long. P. rigida, p. 148 



e. Cone short and ovoid, less than .7 dm. long. 



P. serotina, p. 149 

 ee. Cone long, .7-1.2 dm. long. P. tceda, p. 150 



bb. Leaves short and flat, not united in sheath. 



Tsuga canadensis, p. 150 

 aa. Seeds in a spherical nut-like cone, leaves deciduous. 



Taxodium distichum, p. 151 

 aaa. Seeds in a bluish, smooth or angled berr3'-like fruit. 



b. Berry angular, persisting after opening as a brownish and woody 



nutlet. Chamaecyparis thyoides, p. 151 



bb. Berry smooth and deciduous. Juniperus virginianus, p. 153 



Family PINACE.^. Conifers. 



PINUS L. 



Pinus strobus L. White Pine. 



PI. IV., Fig. 5- 



Pinus strobus Linnaeus, Sp. PI. looi. 1753 [Virginia and Canada]. — Knies- 

 kern 29. — Willis 57. — Britton 301. 



Originally, at least, a common forest tree of the northern 

 counties, but occurring only sporadically in the Middle district 

 and in no sense a characteristic species of our region. 



Fl. — June (apparently). Cones mature in early autumn of the 

 second season, commonly falling during the winter. 



Middle District. — Pine Brook Station (C), Bordentown, Woodbury (C), 

 Berlin (C), Swedesboro. 



