PINTS 



G.Jiuih cjli.xlric, 

 IV i * h spreading 

 scales tittle ornot 

 resinous: lvs.S-12 

 in. long, dark 

 green, in 2's and 



g's 22. Cubensis 



GO. Buds ohlong -ovate, 

 resinous: tt-s. 6-9 

 in. long, light or 

 slightly bluish 



green .21. Tseda 



fiOG. Buds ovate, acumi- 

 nate. resinous:lvs. 

 5-11 in. long, dark 

 yellowish green. ..20. ponderosa 

 Ff . Length of Ivs. S-7 in. 

 (See also No. 29.) 

 o. Charncter of Ivs. 

 slender. 

 11. Foliitiie pale yel- 

 lowish or bluish 

 green: buds ob- 

 'long -ovate, 



dark brown 20. tuberculata 



HH. Foliage bright 



green: buds 



ovate, bright 



chestnut -brown. 21 . radiata 



ci<i. Character of Ivs . 



H.Form of buds 

 thick, ovate, 

 acute or acumi- 

 nate 20. ponderosa, 



var. scopulorum 

 HH. Form of buds ob- 

 long-ovate 28. rigida 



A. Xumberoflvs.Z. 

 B. Branchlets glaucous. 



c. Buds very resinous :i(). Virginiana 



cc. Buds not or little resiiioi(.'<. 

 o.ffue of Ivs. dark blulsji 



green 20. ecMnata 



DD. Hue of Ivs. bright green. .-i'.i. densiflora 

 BB. Branrhlets not glaucous. 

 f. Length of Ivs. l-SY^ in. 

 D. Branch lets brown or 



muricata 



11. /,■. ; 



, ,.. Im iin, i"iis . . ..'!7. Pinaster 



nplural 39. Pinea 



EE. Scales of the thick 

 ovate -acuminate buds 

 with the tips not re- 

 flej-ed, light broivn, 



F. Foliage lustrou s , 

 resin-ducts periph- 



FF. Foliage dull : resin- 

 duets parenchyma- 

 tous 36. Laiicio 



Key Based on Coses and Seeds. 

 Cone-svales thin at the apex, 

 with a marginal obtuse umbo: 

 number of Irs. o: sheaths de- 

 ciduous: fibro-vascular 

 bundle 1: wood soft and light.. 

 Strobus. 

 B. Wings longer than seed: cones 

 long and slender: resin- 

 ducts of Ivs. peripheral. 

 Fustrobi. 

 r. Scales with broad, rounded 



D. Lvs. slender: branchlets 



usuatlif glabrous 1. excelsa 



2. Peuce 



3. Strobus 

 DD. Lvs. stout : branchlets 



p b I ] b 14 monticola 



o Lambertiana 

 ( S al tl I g t I a d 



t p n J t I I 



] X 6 Ayacahuite 



thth k 



f I 

 lit jl b 



,h r: l.r.: ,n III. Is hroirii .'.C claUSa 

 EE. (■h.n;,,-l,,-„f Irs. stout, 

 t w isle d : branch lets 

 orange or orange- 

 brown. 

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



a. Resin-ducts 1 or 2.:v.\. contorta 

 GO. Resin-ducts 2-H ...34. )»ungens 

 FF. Lvs. H-l in. long ...31. divaricata 

 DD. Brnnehlets dull greenish 

 urllnw nr greenish 

 hrnwu: nsii, iluets pe- 

 ons 41 Halepensis 



EE. Character of lvs. stout: 

 buds coated with resin . 



F. Generally a tree 44. sylvestris 



FF. Generally a shrub.. .io. montana 

 CC. Length of lvs. S-9 in. 



D. Color of buds whitish or 



grayish white 38. Thunbergi 



DD. Colorof buds brown. (See 



also No. 41.) 



E. Scales of the oblong 



buds with reflexed 



tips, chestnut-brown. 



P. Habit of U'S. very 



slender and thin..'.V2. Massoniana 

 FF. Babit oflvs. stiff and 

 rigid. 



1 

 ? d 

 I t pa 



parviflora 

 Eoraiensis 



