1348 



PINUS 



PINTTS 



a 



1817. Pinus palustris. 



Leaf with two fibro-vaseular bundles (a) : several in- 

 ternal resin-duets (6) ; one layer of strengthening cells 

 (c) beneath the epidermis and on the inner sida of the 

 fibro-vascular bundles; stomata (d) all around. 



1818. Pinus echinata. 



Leaf with two fibro-vascular bundles (a) and several 

 parenchymatous resin -ducts (6); only one layer of 

 strengthening cells (c) beneath the epidermis; stomata 

 (d) all around. 



alba, 3. 



albo-terminata, 43. 

 argentea, 44. 

 aristata, 15. 

 attenuata, 26. 

 aurea, 43, 44. 

 australis, 23. 

 Austriaca, 36. 

 Ayacahuite, 6. 

 Balfouriana, 15. 

 Banksiana, 31. 

 Benthamiana, 20. 

 Bolanderi, 33. 

 brevifolia, 3. 

 Bungeana, 11. 

 Buonapartea, 6. 

 Boursieri, 33. 

 Calabrica, 36. 

 Canariensis, 24. 

 Oarpatica, 45. 

 Cebennensis, 36. 

 Cembra, 10. 

 clausa, 32. 

 columnaris, 44. 

 compacta, 44. 

 coutorta, 33. 

 Coulteri, 18. 

 Cubensis, 32. 

 densiflora, 43. 

 divaricata, 31. 

 Don-Pedrii, 6. 

 echinata, 29. 

 edulis, 13. 

 ElKntii, 22. 

 excel.sa, 1. 

 fastigiata, 3, 44. 

 flexilis, 7. 

 Fremontiana, 14. 



Graezelieri, 4. 

 Halepensis, 41. 

 Hamiltoni, 37. 

 heterophylla, 22. 

 horizontalis, 36. 

 inops, 30. 

 insignis, 27. 

 Jefifreyi, 19. 

 Koraiensis, 9. 

 Lambertiana, 5. 

 Larieio, 36. 

 Lemoniaoa, 87. 

 Jjoudoniana, 6. 

 longifolia, 25. 

 maerocarpa, 18. 

 Mandshurica, 9. 

 niaritima, 37. 

 Massoniana, 38, 42. 

 minor, 37. 

 niitis, 29. 

 monophylla, 14. 

 Monspeliensis, 36. 

 montana, 45. 

 Mmvtereyensis, 27. 

 montieola, 4. 

 Mughus, 45. 

 muricata, 35. 

 Murrayana, 33. 

 nana, 3. 

 Nepalmisis, 1. 

 nigra, 36. 

 nigricans, 36. 

 nivea, 3. 

 Oeulus draconis, 



38, 43. 

 Pallasiana, 36. 

 palustris, 23. 

 Parryana, 12. 



parviflora, 8. 

 pendiila, 20, 44. 

 Pence, 2. 

 Pinaster, 37. 

 Pinea, 39. 

 Pithyusa, 41. 

 ponderosa, 20. 

 prostrata, 3. 

 pumila, 10, 44. 

 Pumilio, 45. 

 pungens, 34. 

 pygmcea, 3, 36. 

 pyramidalis. 3, 44. 

 Pyrenaica, 36 and 



suppl. 

 Quadrifolia, 12. 

 radiata, 27. 

 resinosa, 40. 

 rigida, 28. 

 rostrata, 45. 

 rotimdata, 45. 

 Roxhurghi, 25. 

 Sabiniana, 17. 

 Salzmanni, 38. 

 scopulorum, 20. 

 Sibirica, 10. 

 Sinensis, 42. 

 Strobus, 3. 

 sylvestris, 44. 

 Taeda, 21. 

 Thunbergi, 38. 

 Torreyana, 16. 

 tubereulata, 26. 

 umbraculifera, 3. 

 uncinata, 45. 

 variegata, 38. 43. 

 Virginian a, 30. 

 zebrina, 1. 



Key for Detekmining Pinks Without Conk-s (compare 

 Pigs. 1815-1818). 

 A. Number of Zt^s. 5, only occa- ' 



sionally 3 or 4. 

 'B. Sheaths deciduous: fibro- 

 vascular bundle 1. 

 C. Edges of Ivs. serrulah'. 

 D. jjength of Irs. l}4-8 in. 

 E. Branchlets (jlabrous or 

 nearly so. 

 p. I'he Ivs. 6-8 in. long: 



branchlets glaucotis. 1. excelsa 

 FP. The Ivs. 3—5 in. long: 

 b r a n chlet s n o i 

 glaucous. 

 G. Tree a rather dense 



pyramid 2. Peuce 



GG. Tree an open pyra- 

 mid ."{. Strobus 



KE. Branchlets densely 



brownish tomentose ..10. Cembra 

 BEE. Branchlets pubescent 

 or puberulous . 

 p. JYe edles slender, 

 somewhat pendu ■ 

 lous, 4-6 in. long... (i. Ayacahuite 

 pp. Needles stiff, 1%-^ in. 

 long. 



G. Back of Ivs. with 



fine white lines... 5. Lambertiana 

 GG. Back of li's. usu- 

 ally not lined. 

 H. Color of li'S. blu- 

 ish or dark 



green 4. montieola 



HH. Color of Ivs . 



bright green 9. Koraiensis 



DD. Length of Ivs. %-l% in.: 

 Ivs. usually twisted, 

 forming brttsh - like 

 tufts at the end of the 



branchlets 8. parviflora 



CO. Edges of Ivs. entire. 



D. iivs. 1^2-3 in. long 7. flexilis 



DD. Lvs. 1-1}4 in. long 15. Balfouriana 



BB. Sheaths persistent: fibro- 

 vascular bundles 2: lvs. 



8-12 in. long, rigid 16. Torreyana 



AA. Number of lvs. 3, or 4 or 1, only 

 occasionally 2 or 5. 

 B. Usually solitary, sometimes 



■ in 2's 14. monophylla 



BB. I'sually 4, sometimes 3 or 5. .VI. Parryana 

 BBB. Usually 3, occasionally 2. 

 c. Fibro -vascular bundle 1: 

 sheaths deciduous. 

 D. Margin of lvs. entire: lvs. 



Va-IVi in. long 13. edulis 



DD. Margin of lvs. serrulate: 



lvs. 2-4 in. long 11. Bungeana 



CO. Fibro-vascular bundles 2: 



sheaths persistent. 



D. Branchlets glaucous: lvs. 



bluish or grayish green. 



(See also No. 21.) 



E. Habit of lvs. slender, 



drooping 17. Sabiniana 



EE. Habit of lvs. straight, 



stiff. 



p. Buds very resinous: 



lvs. 6-12 in. long, 



dark bluish green... 18. Ooulteri 



FF. Buds not or little 



resinous: lvs. 5-8in. 



long, pale bluish 



green 19. Jeffreyj 



DD. Branchlets not glaucous: 

 lvs. da rk yellow or 

 bright green. 

 E. Habit of lvs. slender, 

 drooping. 

 p. Resin - ducts inter- 

 nal 2.3. palustris 



pp. Jt'esin - ducts paren- 

 (• h y m at ous: buds 



brown 24. Canariensis 



PPP. Bes in ■ ducts periph- 

 eral: buds b r i (/ h f 



eliesfnut-brou-n . 25. longifolia 



EE. Habit of Ivs. stiff. 

 P. Length of lvs. 6-12 in. 



