1350 



PINUS 



PINUS 



C. Number of Ivs. 5: resin- 

 ducts parenchymatous . 



Pseudostrobi 16. Torreyana 



cc. Ntimber of Ivs. 3, occasion- 

 ally 4-5: resin-ducts tisu- 

 ally parenchymatous. 

 Tcedce. 

 T). Branchlets glaucous: 

 color of Irs. bluish or 

 grayish green. 

 E. Lvs. slender, d rooping .1" . Sabiniana 

 EE. Lvs. stout ,6-1^ ill. long: 



seeds hiiii/-ivinged 18. Coulteri 



19. Jeffrey! 

 DD. Branchlets not glaucous: 

 color of lvs. dark yel- 

 lowish or bright green. 

 E. Length of lvs. 5-12 in.: 



lvs. stout 20. 



21. 



ponderosa 



Taeda 



Cubeusis 



EE. Length of lvs. 8-18 in.: 



lvs. slender , drooping .2^. 

 24. 

 25. 

 EEE. Length of lvs. 3-7 in.: 

 lvs. stout. (See also 

 No. 20 var. ) 

 F. Cones very oblique, 

 3i4-6in. long: length 

 of lvs. usually 4-6 



in 26. 



27. 

 FP. Cones not oblique, S^ 

 in. long : length of 

 lvs. usually 3-4 in. .28. 

 CCC. Number of lvs. 2. 



D. Resin-ducts parenchyma- 

 tous : cones mostly be- 

 tween the whorls. 



Lariciones 29. 



E. Branchlets glaucous ..30. 

 EE. Branchlets not glau- 

 cous. 

 F. Lvs. 1-3% in. long. 

 Q. Cones not prickly.. 3\. 



GG. Cones prickly 32. 



33. 

 34. 

 FF. Lvs. 3}4-7 in. long. 

 G. Winter-budsbrown.35. 

 36. 

 37. 

 GG. Winter-buds gray- 

 ish white or silvery 

 white, oblong, not 

 resinous, only tips 

 of scales often 



light brown 38. 



T>T). Resin-ducts peripheral: 

 cones usually appearing 

 at the whorls. Sylves- 

 tres. 

 E. Length of lvs. 2}4-8 in. 

 F. Seeds short-winged, 



% in. long 39. 



FF. Seeds long-winged. 

 G. Branchlets not 



glaucous 40. 



41. 

 42. 

 GG. Branchlets g lau - 



cous 43. 



EE, Length of lvs. %-2'%, in.ii. 

 45. 

 I. Strobus. 

 1. Uustrobi. 



palustris 



Ganariensis 



longifolia 



tuberculata 

 radiata 



rigida 



ecbinata 

 Virginiana 



divaricata 

 clausa 

 contorta 

 pungens 



muricata 



Laricio 



Pinaster 



Thunbergi 



Finea 



resinosa 



Halepensis ^^""^^ ■' 



Massoniana %> 



densiflora 

 Bylvestris 

 montana 



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, hardj' 

 as far north as Mass. in sheltered po- 

 sitions. Var. zebrlna, Bailly, has the 

 lvs. with a whitish zone near the tip. 



2. Petice, Griseb. (P. excilsa, var. 

 Pence, Griseb.). Attains 50 ft., 

 with ascending short branches form- 

 ing a narrow dense pyramid : branch- 

 lets greenish, glabrous, not glaucous : 

 winter-buds ovate: lvs. straight, blu - 

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

 stalked, cylindric, 33^-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. Strobus, 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- jgjg^ pin^g strobus. 

 berulous : winter-buds ovate, acura- (x V ) 

 inate: lvs. soft, bluish green, 2-4 in. 



long (or 3>2-5) : cones on stalks Vi-X 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, 

 S.S. 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. dlba, Loud, 

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

 almost silvery white foliage. Var. brevifolia, Loud, 

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

 compact, round bush, with short lvs. Var. fastigiata, 

 Beissn. (var. pyramiddlis, Hort.). With ascending 

 branches, of narrow pyramidal or columnar habit. Var. 

 prostr^ta, Arb. Kew. Dwarf, procumbent form, diffuse 

 and trailing on the ground. Var. umbraculifera, Knight. 

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

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

 low foliage. 



4. monticola, Don. Mountain White Pine. Tree, to 

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

 somewhat pendulous branches forming a narrow open 



1830. Pinus Strobus (X 3^). 



1. exc6lBa, Wall. (P. iVepaZ^wsis, Chambr.). Attains 

 150 ft., with spreading and slightly ascending branches 

 forming a broad open pyramid : branchlets greenish, 

 glabrous, glaucous: winter -buds cylindric -obovate, 

 ftcute: lvs. slender, flaccid, drooping, grayish or bluish 



pyramid: branchlets ptiberulous, yellowish or reddish 

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

 green and glaucous, 13^-4 in. long, with few inconspic- 

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

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



