STORKS AGRICULTURAL EXPERIMENT STATION. 335 



84. Twigs smooth or downy but not woolly; buds pointed, generally 

 smooth or somewhat downy; stipule-scars more or less behind 

 leaf- scar. . Plum (Prunus) 150 



THE PINES 

 Pinus. 



Needle-shaped leaves in many small clusters of 5 or less, each 

 cluster surrounded by a persistent or deciduous sheath and borne on a 

 rudimentary branch which is subtended by a scale-like primary leaf; 

 fruit a cone with woody scales, maturing at the end of the second or 

 third season; seeds winged. The position of the resin-ducts in the 

 leaves is a distinctive character of some value and may be observed 

 if a thin cross section is made with a sharp knife and viewed toward the 

 light with a hand-lens. Twig photographs are about *4 natural size. 



85. 5 needles in a cluster White Pine (Pinus Strobus)v.344 



85. Less than 5 needles in a cluster 86 



86. 3 needles in a cluster Pitch Pine (Pinus rigida) p.34C 



86. 2 needles in a cluster 87 



87. Needles 3-6 in. long, cones at right angles to branch 88 



87. Needles ty-Sty in. long, cones pointing either backward or for- 

 ward . . . 89 



88. Twigs reddish-brown, leaves slender and flexible, resin-ducts peri- 

 pheral; native species Red Pine (Pinus resinosa, p.350 



88. Twigs yellowish-brown, leaves thicker and stiff, resin-ducts between 



periphery and bundle; European species 



Austrian Pine (Pinus Laricio, var. austriacaj p.352 



89. Cones pointing forward, leaves %-!% in. long, dark yellowish- 

 green, resin-ducts between periphery and bundle; native species. 

 Jack Pine (Pinus Banksiana) p.348 



89. Cones pointing backward, leaves l%-3% in. long, bluish-green, 



resin-ducts peripheral; European species 



Scotch Pine (Pinus sylvestris) p.354 



THE LARCHES 

 Larix. 



Pyramidal deciduous-leaved cone-bearing trees; twigs with resin- 

 ous taste; rapidly-grown shoots with numerous scattered strongly de- 

 current leaf-scars with single bundle-scars; short stout wart-like 

 branches with densely clustered leaf-scars abundant. 



90. Cones %-% inch long with few scales; twigs pale reddish-brown; 



a native tree growing in swamps 



American Larch (Larix laricina) p.356 



90. Cones 1 inch or more long with many scales; twigs yellowish, 



stouter; a European tree 



European Larch (Larix decidua) under Comparisons p.356 



THE SPRUCES 

 Picea. 



Evergreen pyramidal trees with scaly bark, alternate scattered, 4- 

 angled leaves without proper leaf-stalks but perched on persistent 

 decurrent projections from the bark and ovate to cylindrical pendant 

 cones which fall off the tree entire. The Spruces are distinguished from 

 the Balsam Fir by the 4-sided scattered leaves, the projecting leaf-scars 

 and the scaly bark. Twig photographs are about % natural size. 



91. Twigs hairy 92 



91. Twigs smooth or nearly so, cones cylindrical 94 



92. Cones cylindrical, more than 3 inches long; cultivated species 



Norway Spruce (Picea Abies) p.366 



92. Cones ovate to oblong, less than 3 inches long 93 



93. Leaves dark yellowish green, %-% inch long. Cones ovate-oblong 

 ! 1 /4-2 inches long; a tree growing on uplands, rarely in wet places, 

 reaching 40 ft. or more in height Red Spruce (Picea rubrajp.360 



