1350 



PINUS 



c. Numier of Ivs. 5: resin- 

 ducts parenchymatous. 



Pseudostrobi 1( 



CO. Number of Ivs. S, occasion- 

 ally 4-5: resin-ducts usu- 

 ally parenchymatous. 

 Tcedm. 

 D. Branchlets glaucous: 

 color of Ivs. bluish or 

 grayish green. 

 E. Lvs. slender, drooping .1 

 EE. I/vs. stout,6-12in.long: 

 seeds long-winged 



19. 



DD. Branchlets not glaucous: 



color of Ivs. da>-k yel- 



loivish or bright green. 



E. Ijengfh of Ivs. 5-12 in.: 



Ivs. stout : 



ponderosa 



Taeda 



Cubeiisis 



palustriB 



Canariensis 



longitoUa 



. Length of Ivs. S-7 in.: 



Ivs. stout. (See also 



No. 20 var. ) 



F. Cones veni oblique. 



S)4-6iH.long: length 



of Ivs. usually 4-6 



PP. Cones not oblique, S— 4 

 in. long : length of 

 Ivs. usually S-i in. .28. rigida 

 CCC. Number of Ivs. £. 



D. Mesin-ducts parenchyma- 

 tous: cones mostly be- 

 tween the whorls. 



Lariciones 29. echinata 



E. Branchlets glaucous ..30. ViTginiana 

 EE. Branchlets not glau- 

 cous. 

 T. Lfvs. ISYi in. long, 

 a. Cones not prickly.. SI. divaricata 



QG. Cones prickly 32. clausa 



33. contOTta 

 34. 

 pp. Zfvs. S%-7 in. long. 

 a. Winter-budsbrown.Zh. 



.%. Laricio 

 37. Pinaster 

 GO. Winter-buds gray- 

 ish white or silvery 

 white, oblong, not 

 resinous, only tips 

 of scales often 



light brown 38. Thunbergi 



x>r>. Besin-ducts peripheral: 

 cones usually appearing 

 at the whorls. Sylves- 



E. Length of Ivs. S}4-8 in. 

 T. Seeds short-winged, 



% in. long 39. Pinea 



FF. Seeds long-winged. 

 O. Branch lets not 



glaucous 40. resinosa 



41. Halepensis 



42. Massoniana ^ ^ 

 QQ. Branchlets glau- ^^ , 



cous 4.1. densiflora ^7 



EE. Length oflvs.%-S% i».44. sylvestris 



* 45. montana 



I. Stkobus. 



1. Eustrobi. 



1. exc^lsa, Wall. (P. NepaUnsis, Chambr.). Attains 



150 ft., with spreading and slightly ascending branches 



forming a broad open pyramid : branchlets greenish, 



glabrous, glaucous: winter -buds cylindric - obovate, 



acute : Ivs. slender, flaccid, drooping, grayish or bluish 



PINUS 



green, 6-8 in. long: cones cylindric on 1-2 in long 

 stalks, 6-10 in. long: seed brown, 4 lines long. Himal. 

 Gn. 31, p. 195. A.G. 19:149.-Handsome tree, of some- 

 what loose habit, with graceful pendulous foliage, hardy 

 as far north as Mass. in sheltered po- 

 sitions. Var. zebrlna, Bailly, has the 

 Ivs. with a whitish zone near the tip. 



2. Peilce, Griseb. (P. exc(lsa,-v&T. 

 Peiice, Griseb.). Attains 50 ft., 

 with ascending short branches form- 

 ing a narrow dense pyramid : branch- 

 lets greenish, glabrous, not glaucous: 

 winter-buds ovate: Ivs. straight, blu- 

 ish green, 3-4 in. long; cones short- 

 stalked, cylindric, 3^-6 in. long, 

 with obovate scales: seed 4 lines 

 long. S. E. Eu.— An ornamental 

 hardy Pine of dense, regular habit 

 and slow growth; forms a narrower 

 and denser pyramid than No. 3. 



3. Strdbus, Linn. White Pine. 

 Figs. 1815, 1819, 1820. Attains 100. 

 occasionally 150 ft., with horizontal 

 branches in regular whorls forming 

 a symmetrical open pyramid. In old 

 age the head is usually broad and 

 open and often very picturesque. 

 Branchlets greenish or light green- 

 ish brown, glabrous or slightly pu- ,3i9_ p^^^^ Strobus. 

 berulous : winter-buds ovate, acum- (X !>» ) 

 inate: Ivs. soft, bluish green, 2^ in. "' 



long (or 3J^-5) : cones on stalks %-l in. long, cylindric, 

 slender, often curved, 2-4 in. long, with oblong-obovate 

 scales : seed red-brown, mottled with black, 3 lines long. 

 Newfoundland to Manitoba, north to Ga., 111. and Iowa. 

 8.8.11:538,539. A.G. 12:645; 13:1. Gn. 30, p. 404. -Very 

 valuable ornamental hardy Pine of rapid growth, sym- 

 metrical when young, picturesque in old age : no tree is 

 better adapted to break up the monotonous sky-line of 

 plantations in northern parks. There are a number of 

 garden forms occasionally cultivated. Var. 41ba, Loud, 

 (var. iiivea, Carr. ). Low form of irregular habit, with 

 almost silvery white foliage. Var. brevifdlia. Loud. 

 (var. ndna. Knight. Var. pygmiea, Hort.). Dwarf, 

 compact, round bush, with short Ivs. Var. fastigi&ta, 

 Beissn. (var. pyramid Alls, Hort.). With ascending 

 branches, of narrow pyramidal or columnar habit. Var. 

 pro8tr&ta, Arb. Kew. Dwarf, procumbent form, diffuse 

 and trailing on the ground. Var. umbracullfera. Knight. 

 Dwarf, flat-topped bush, with short Ivs. R.H. 1869, p. 

 38. There are also forms with variegated and with yel- 

 low foliage. 



4. montlcola, Don. MotrNTAiN White Pine. Tree, to 

 100 or occasionally 150 ft., with slender, spreading, 

 somewhat pendulous branches forming a narrow open 



1830. Pinus Strobus (X H). 



pyramid: branchlets puberulous, yellowish or reddish 

 brown: winter -buds ovate, acute: Ivs. stiff, bluish 

 green and glaucous, lK-4 in. long, with few inconspic- 

 uous or no lines on the back: cones short-peduncled, 

 cylindric, slender, slightly curved, 5-11 in. long, yellow- 



