354 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 



Shumard red oak (Quercus shumar- 



dii). 

 Sierra, 



bearberry (Arctostaphylos nevaden- 

 sis). 



bladdernut (Staphylea bolanderi). 



coffeeberry (Rhamnus rubra). 



currant (Ribes nevadense). 



gooseberry (Ribes roezlii). 



maple (Acer glabrum). 



plum (Pruniis subcordata). 



sweet bay (Myrica hartwegii). 



willow (Salix comrmitata, 



Salix orestera). 

 Silkbay (Per sea humilis). 

 Silktassel, 



Coast (Garry a elliptica). 



Fremont (Gkirrya fremontii). 



Pale (Garry a flavescens). 



Veatch (Garry a veatchii). 



Yellowleaf (Garrya flavescens). 

 Silktassel bush (Garrya, elliptica, 



Garrya lindheimeri ) . 

 Silktree (Albizzia julubrissin) . 

 Silky, 



camellia (Stuartia malachodendron ) . 



cornel (C omits amomum). 



willow (Salix sericea, 



Salix sitchensis). 

 Silver, 



birch (Betula lutea, 



Elaeagnus argentea). 



bush (Elaeagnus argentea). 



bush, desert (Shepherdia rotundi- 

 folia). 



chain (Robinia pseudoacacia) . 



fir (Abies amabilis, 

 Abies concolor, 

 Abies grandis). 



lupine (Lupinus albifrons). 



maple (Acer saccharinum) . 



mountain-m a h o g a n y ( Cercocarpus 

 argenteus). 



oak (Quercus hypoleuca). 



poplar (Populus alba). 



sagebrush (Artemisia cana). 



willow (Salix argyrocarpa, 

 Salix discolor, 

 Salix geyeriana). 

 Silverbell, (Halesia Carolina). 



Little (Halesia parviflora). 



Mountain (Halesm monticola) . 



Two- wing (Halesia dipt era). 

 Silverbell tree (Halesia Carolina). 

 Silverberry (Elaeagnus argentea). 

 Silverleaf, 



hydrangea (Hydrangea radiata). 



willow ( Salix argophylla) . 

 Silverling (Baccharis haUmifolia). 

 Silvery wormwood (Artemisia ftti folia). 

 Single spruce (Picea canadensis). 

 Singleleaf pine (Pinus monophylla) . 

 Sitka. 



alder (Alnus sinuata). 



cypress (Ohamaecyparis nootkaten- 



te). 



Sitka Continued. 



spruce (Picea sitchensis). 



willow (Salix sitchensis). 

 Skunk, 



bush (Rhus trilobata). 



currant (Ribes bracteosum, 

 Ribes glandulostim, 

 Ribes prostratum). 



spruce (Picea canadensis). 

 Slash pine (Pinus caribaea, 



Pinus pakistris). 

 Slender, 



buckwheatbrush (Eriogonum micro- 

 thecum) . 



poreleaf (Porophyllum gracile). 



willow (Salix exigua). 

 Slick oak (Quercus velutina). 

 Slickbark oak (Quercus velutina). 

 Slippery elm, (Ulmus fulva). 



California (Fremontia calif ornica ) . 

 Sloe (Prunus umbellata, 



Viburnum prunifolium) . 

 Small, 



chestnut oak (Quercus prinoides). 



cranberry (Vaccinium oxycoccus). 



pignut hickory (Gary a microcarpa, 

 Cory a ovalis). 



post oak (Quercus margaretta). 



sagebrush (Artemisia nova). 



serviceberry (Amelanchier humilis). 



viburnum (Viburnum obovatum). 

 Small's hackberry ( Celtis smallii ) . 

 Small-flowered, 



mountain- mahogany ( Cercocarpu s 

 minutiflorus) . 



papaw (Asimina parviflora). 

 Small-fruited, 



hickory (Carya microcarpa). 



papaw (Asimina parviflora). 

 Small-leaf, 



mahogany (Cercocarpus intricate s). 



mockorange (Philadelphus micro- 



pnyllus). 

 Small-leaved horsebean (Parkinsonia 



microphylla). 



Smilax (Smilax lanceolata). 

 Smith buckthorn (Rhamnus smithii)- 

 Smoketree (Ootinus americanus, 

 Parosela spinosa). 

 Smooth, 



alder (Alnus rugosa). 



ash (Fraxinus velutina). 



azalea (Rhododendron arborcscens). 



clematis (Ctematis addisonii). 



cottonwood (Populus acuminata). 



cypress (Cupressus glabra). 



gooseberry (Ribes oxyacanthoides, 

 Ribes rotundifolium) . 



hydrangea (Hydrangea arborescens). 



labrador tea (Ledum glanduJosum) . 



redbay (Per sea borbonia). 



serviceberry (Amelanchier laevis). 



sumac (Rhus glabra). 



willow (Salix laevigata). 



winterberry (Ilex laevigata). 



withe rod -(Viburnum nudum). 



