302 THE CULTIVATED EVERGREENS 



FF. Young branchlets not bloomy (sometimes slightly 

 so in Nos. 36 and 37). 

 G. Leaf with marginal resin-ducts. 

 H. Leaves 5-8 inches long. 



I. All leaves stiff and rigid 19. P. Pinea 



II. All leaves very thin and slender 21. P. Massoniana 



HH. Leaves 3-6 inches long 36. P. halepensis 



GG. Leaf with medial or internal resin-ducts, lus- 

 trous green, 5-9 inches long 37. P. Pinaster 



cc. Spring-shoots multinodal, with more than one whorl of 

 branchlets. 

 D. Young branchlets glaucous. 



E. Winter-buds not or little resinous: leaves 3-5 inches 



long, sometimes 3 31. P. echinata 



EE. Winter-buds resinous, with appressed scales: leaves 



l}/2~3 inches long 40. P. virginiana 



DD. Young branchlets not glaucous (sometimes slightly so 

 in No. 36). . 

 E. Length of leaves J^-3j^ inches. 



F. Branchlets brown to orange: leaves with medial 

 resin-ducts. 



G. All leaves slender: branchlets brown 39. P. clausa 



GG. All leaves stout: branchlets orange to orange- 

 brown. 

 H. Leaves %~13^ inches long, twisted and flat- 

 tened, in remote clusters 41. P. Banksiana 



HH. Leaves 1-33^ inches long. 



I. Leaf sUghtly twisted, with 2-5 resin-ducts. 38. P. puiigens 

 II. Leaf strongly twisted, mth 1 or 2 resin- 

 ducts 42. P. contorta 



FF. Branchlets dull greenish-yellow, sometimes 

 bloomy: leaves often longer than 33^ inches, 



with marginal resin-ducts 36. P. halepensis 



EE. Length of leaves 3-9 inches. 



F. Resin-ducts marginal: leaves 3-6 inches long 36. P. halepensis 



FF. Resin-ducts medial or internal. 



G. Leaves 5-9 inches long, lustrous green: winter- 

 buds not resinous 37. P. Pinaster 



GG. Leaves 4-6 inches long, dark green. 



H. Winter-buds not or little resinous: bark of 



branches and upper part of trunk smooth . 32. P. glabra 

 HH. Winter-buds resinous: bark of branches and 



trunk scaly 43. P. muricata 



Subgenus I. HAPLOXYLON. SOFT PINES. 



Leaves with one fibro- vascular bundle, entire or serrulate; base of bract 

 subtending the leaf-fascicle not decurrent; sheath of leaf -cluster deciduous 

 (except in the Mexican P. Nelsonii, Shaw): wood soft, with little resin, 

 light-colored. 



