128 Muhlenbergia, Volume 6 



( )f the species and varieties listed above, ten belong in the 

 Nevadan region, six in the Cismontane, one in the Desert; three 

 occur in both the Cismontane and the Nevadan, one in both 

 Cismontane and Desert, while five are found in all these regions. 

 There are two species which are restricted to North America, 

 where they have an extensive distribution, two others reach 

 South America, one reaches Europe and one Japan, not includ- 

 ing the two species which may be counted as cosmopolitan. 

 Nearly two-thirds of the whole number, namely 16, are confined 

 to the Pacific coast of North America, and of these, two are en- 

 demic to southern California, while two other extend but a short 

 distance beyond its boundaries. 

 San Bernardino, California. 



THE LIMBER PINE 

 By A. A. Heller 



PlNUS flexilis James, Long Exped. 2: 35. 1823. 



Apinus flexilis Rydb. Bull. Torr. Club 32: 598. 1905. 

 Discovered nearly a century ago by Dr. James, a member 

 of one of the pioneer expeditions to the then almost unknown 

 far west, this species of pine is still a rarity in collections, due, 

 no doubt, to the fact that it inhabits high ranges not much fre- 

 quented by persons interested in the study of trees. The origi- 

 nal account gives its habitat as "arid plains subjacent to the 

 Ro< kv Mountains, and . . up their sides to the region of 

 perpetual frost." 



\t first 1 was inclined to follow Dr. Rydberg in his tieat- 

 inenl of this species, but field observation lias changed my opin- 

 ion. There is nothing about the appearance of the tree, either 

 ingrowth, bark, leal or cone to separate it from Pinus proper. 

 The seeds are wingless, and this character it has in common 

 with the nut pines, which Dr. Small has separated under the 

 name ( atyopitys. The scale tips are without prickles, but air 



not as much thickened as in some other species unhesitatingly 

 red to Pinus. 



