KEY TO THE DWARFS OF THE PINE FAMILY 



323 



•^ as wide as long, midrib yellow. A willow with slender 

 erect branches forming broad thickets on sand bars in the 

 streams. Sand Bar Willow — Salix longifolia (S. fluvi- 

 ^tilis). [Twig cuttings.] 



Rliscus aculeiltus. The Butchee's 

 Broom (583) is a peculiar evergreen 

 shrub, 1 to 4 feet, with alternate 

 sessile ovate leaves J to 1 J inches long ; 

 these are not true leaves but flat leaf- 

 like branches ending in sharp points 

 and having on their lower sides the 

 small flowers in spring and the red 

 berries (J inch thick) later in the sea- 

 son. It is hardy only in the extreme 

 South. [Suckers.] 



Coniferous Evergreens. The shrubby 

 plants with narrow-linear, needle- 

 shaped, and scale-shaped leaves are 

 still to be described. They include 

 Pines, Spkuces, AnDORviT^as, Juni- 

 PEKS, etc. These ornamental shrubs 



are included in key 9, small-leaved plants, but for convenience the 

 following key is devoted to the Pine family alone. In this family there 

 are no compound leaves ; each green scale or needle-shaped part is a 

 whole leaf. 



Fio. 583. — Butcher's Broom. 



KEY TO GENERA WITH DWARF FORMS BELONG- 

 IKG TO THE PINE FAMILY 



* Leaves elongated four or more times as long as wide and spreading 

 away from the twigs. (A.) 

 A. Leaves not flattened but rather needle-like so that they can be 

 rolled between thumb and finger. (B.) 

 B. Leaves in clusters or bundles of 2-3-5 surrounded at base by a 

 sheath. Pinus. 



B. Leaves separated from each other, spirally arranged and 

 attached to short brownish projections on grooved twigs. 

 Picea. 



A. Leaves decidedly flat and linear in shape. (C.) 



C. Leaves with distinct more or less greenish stems spirally fas- 



