CONTENTS. 



Page. 



Introduction 9 



Definition of a tree 9 



Descriptions and illustration of species 9 



Value of full-sized illustrations 11 



Omission of artificial keys for identification 11 



Technical names of trees 11 



Common names of trees 12 



Sizes of trees 13 



Range of trees 13 



Occurrence of trees 14 



Acknowledgments 15 



Gymnosperma? 19 



Conifera? 19 



Pinus — Pines 19 



White pines 20 



Western white pine; Silver pine (Pinus monticola 



Dougl.) 20 



Sugar pine (Pinus lambcrtiana Dougl.) 23 



Limber pine (Pinus flexilis James) 27 



White-bark pine (Pinus albicaulis Engelmann) 30 



Four-leaf pine: Parry pine (Pinus quadrifolia Pari. Sud- 



worth) 33 



Single-leaf pine (Pinus monophylla Torrey and Fremont) 35 



Bristle-cone pine (Pinus aristata Engelmann) 37 



Foxtail pine (Pinus balfouriana Murray) 39 



Torrey pine; Soledad pine (Pinus torrcrjana Parry) 41 



Yellow pines 42 



Western yellow pine (Pinus ponderoSa Lawson) * 42 



Jeffrey pine {Pirius feffreyi "Greg. Com.") 47 



Lodgepole pine (Pinus contort a Loudon) 49 



Gray pine; Digger pine (Pinus sabiniana Douglas) r»4 



Coulter pine: Bigcone pine (Pinus coulteri Lambert)— 57 



.Monterey pine (I'inus radiata Don.) 58 



Enobcone pine, {Pinus attenuata Lemmon) 02 



Pricklecone pine; Bishop's pine (Pinus muricata Don.)- 05 



Larix — Larches 68 



Western larch {Larix occidentalis Nuttall) OS 



Alpine larch {Larix lyallii Parlatore) 71 



Tamarack (Larix laridna (Du Hoi) Koch) 73 



Picea — Spruces 77 



Engelmann spruce (Picra engelmanni Engelmann) 7S 



Sitka spruce; Tideland spruce (Picea sitchensis (Bong.) 



Trautvetter and Mayer) 81 



Weeping spruce (Picea breiceriana Watson) 84 



3 



