PINUS BANKSIANA, LAMB. 9 



Bark. Bark of trunk in old trees dark brown, rounded- 

 ridged, rough-scaly at the surface ; branchlets dark purplish- 

 brown, rough with the persistent bases of the fallen leaves ; 

 season's shoots yellowish-green, turning to reddish-brown. 



Winter Buds and Leaves. Branch-buds light brown, ovate, 

 apex acute or rounded, usually enclosed in resin. 



Leaves in twos, divergent from a short close sheath, about 

 1 inch in length and scarcely T ^ inch in width, yellowish- 

 green, numerous, stiff, curved or twisted, cross-section show- 

 ing two fibrovascular bundles ; outline narrowly linear ; apex 

 sharp-pointed ; outer surface convex, inner concave or flat. 



Inflorescence. June. Sterile flowers at the base of the 

 season's shoots, clustered, oblong-rounded : fertile flowers 

 along the sides or about. the terminal buds of the season's 

 shoots, single, in twos or in clusters ; bracts ovate, roundish, 

 purplish. 



Fruit. Cones often numerous, 1-2 inches long, pointing 

 in the general direction of the twig on which they grow, fre- 

 quently curved at the tip, whitish-yellow when young, and 

 brown at maturity ; scales when mature without prickles, 

 thickened at the apex ; outline very irregular but in general 

 oblong-conical. The open cones, which are usually much dis- 

 torted, with scales at base closed, have a similar outline. 



Horticultural Value. Hardy in ' New England ; slow grow- 

 ing and hard to transplant ; useful in poor soil ; seldom offered 

 by nurserymen or collectors. Propagated from seed. 



PLATE IV. PINUS BANKSIANA. 



1. Branch with sterile flowers. 



2. Stamen, front view. 



3. Stamen, top view. 



4. Branch with fertile flowers. ' 



5. Ovuliferous scale with ovules, inner side. 



6. Fruiting branch. 



7. Open cone. 



8, 9. Variant leaves. 

 10, 11. Cross-sections of leaves. 



