( 52) 



According to this tabulation there can lie in the United States 

 no more than twenty-nine different pines. Including several dis- 

 tinct varieties, we may safely say that there are about thirty-five 

 kinds. As many different pines, therefore, are found in the con- 

 tinental United States as in the rest of the world. They are scat- 

 tered from one end of the country to the other. As a survival 

 from the first and most obvious classification of these trees that 

 sprang up with the beginnings of lumbering in this country, the 

 pines are still frequently classified as "hard" and "soft" pines. 

 This distinction was originally based upon certain features of the 

 wood and upon that basis it is often inaccurate. Certain so-called 

 "hard" pines may be softer than certain so-called "soft" pines. 

 These two groups, however, are recognized in further technical 

 considerations where there is more accurate distinction. 



Of the thirty-five native pines, twelve are spoken of as "soft"f 

 and the other twenty-three as "hard."$ In the eastern United 

 States the common White Pine is the only truly "soft" pine. The 

 remaining pines in this section of the country are twelve different 

 "hard" species, namely, Pitch, Red, Jack, Table-Mountain, Jersey 

 or Scrub, Longleaf, Shortleaf, Loblolly, Cuban, Pond, Spruce and 

 Sand Pine. The last seven of these are typically southern trees 

 and consequently cannot be represented in the Garden collections. 

 The other five northern species are all in the Pinetum. 



Of the western species, Sugar Pine and Western White-Pine 

 are the most important of the soft pine group. Neither of these 

 occurs in the Garden, but there are six other western species, 

 namely, Digger, Western Yellow, Lodgepole, Jeffrey, Limber, and 

 Pinon Pine. 



The most popular and convenient manner in which the pines are 

 frequently divided and most commonly thought of depends upon 



f These are White Pine (P. Strobus) ; Sugar Pine (P. hambcrtiana) ; Western White 

 Pine (P. monticola) ; Mexican White Pine (P. strobiformis) ; Limber Pine (P. flexilis) ; 

 Whitebark Pine (P. albicaulis) ; Foxtail Pine (P. Balfouriana) ; Parry Pine (P. quadri- 

 folia) ; Mexican Pinon (P. ccmbroides) ; Pinon (P. cdtilis) ; Singleleaf Pinon (P. motw- 

 phylla) ; Bristlecone Pine (P. aristata). 



t These are Longleaf Pine (P. pal list n's), Shortleaf Pine (P. echinata), Loblolly Pine 

 (P. Taeda), Cuban Pine (P. caribaea), Norway Pine (P. resinosa), Western Yellow 

 Pine (P. poiidcrosa), Chihuahua Pine (P. chihitahuana) , Arizona Pine (P. arisonica), 

 Pitch Pine (P. rigida). Pond Pine (P. scrotina). Spruce Pine (P. glabra), Monterey 

 Pine (P. radiata), Knobcone Pine (P. attenuata) , Gray Pine (Pinus Sabiniana), Coulter 

 Pine (P. Coultcri), Lodgepole Pine (P. contort a), Jack Pine (P. Banksiana), Scrub 

 Pine (P. virginiana) , Sand Pine (P. clausa), Table-Mountain Pine (P. pungent), Cali- 

 fornia Swamp Pine (P. muricata), Torrey Pine (P. Torreyana) . 



