CONTENTS. 5 



Monocoty led on es — Con t i n u ed. Page. 



Liliacese 200 



Yucca ___' 201 



Joshua tree (Yucca arborescens (Torr.) Trelease) 201 



Mohave yucca (Yucca mohav'ensis Sargent) 203 



Dicotyledones 205 



Juglandaceae 200 



Juglans— -Walnuts : 206 



California walnut (Juglans californica Watson) 206 



Myricaceae * 208 



Myrica — Wax myrtles 208 



California myrtle (Myrica californica Chamisso) 209 



Salicace.e • 210 



Salix— Willows 212 



Black willow (Salix nigra Marshall) 213 



Almond willow (Salix amygdaloides Andersson) 216 



Smooth willow (Salix laevigata Bebb) 217 



Western black willow (Salix lasiandra Bentham) 2i!> 



Longleaf willow (Salix fluviatilis Nuttall) 222 



Silverleaf willow (Salix sessilifolia Nuttall) 223 



Mackenzie willow (Salix cor4ata mackenziedna Hooker). ^i'."> 



White willow (Sailx lasiolepis Bentham) 220 



Nuttall willow (SaUx nuttallii Sargent) 228 



Broadleaf willow (Salix amplifolia Coville) 229 



Hooker willow (Salix hookeriana Barratt) 232 



Silky willow (Salix sitchensis Sanson in Bongard) 233 



Feltleaf willow (Salix alaxensis (Anderss.) Coville) SMI 



Populus — Cottonwoods and poplars 238 



Aspen (Populus tremuloides Michaux) 239 



Balm-of-Gilead (Populus balsamifera Linnaeus) 244 



Black cottonwood (Populus trichocarpa Torrey and Gray)__ 247 



Fremont cottonwood (Populus fremontii Watson) 25] 



Betulaceae 253 



Betula — Birches '2~<\ 



Western birch (Betula occidentalis Hooker) 254 



Kenai birch (Betula kenaica Evans) 250 



White birch (Betula alaskana Sargent) 258 



Mountain birch (Betula fontinalis Sargent) L><;<> 



Alnus — Alders 263 



White alder (Alnus rhombifolia Nuttall) 263 



Mountain alder (Alnus tenuifolia Nuttall) 260 



Bed alder (Alnus oregona Nuttall) 2<;s 



Sitka alder (Alnus sitchensis (Kegel)' Sargent) L'To 



Cupuliferae 272 



Castanopsis — Chinquapins 272 



Western chinquapin (Castanopsis chrysophylla (Hook.) A. 



de Candolle) 273 



Quercus— Oaks 276 



Valley oak (Quercus lobata Nee) 278 



Brewer oak (Quercus breireri Engelmann) 2S1 



Garry oak (Quercus garryana Douglas) 283 



Sadler oak (Quercus sadleriana R. Brown Campst.) 285 



Blue oak (Quercus douglasii Hooker and Arnott) 2S5 



Alvord oak (Quercus alvordiana Eastwood) 289 



