152 NORTH AMERICAN FAUNA. [no. 16. 



pines in a shallow gulch at the east base of the lava buttes just below 

 'North (late.' The upper limit of the silvery lui)iue usually coincides 

 with the lower limit of the dwarf lupine {L. lijdlli), which species gen- 

 erally pushes from this ])oiut ui)war(l through the Ali)ine zone. 



The root of the silvery lupine is slender and tough, and soon divides 

 into two or three very long wire-like rootlets which run a rather shallow 

 course in the sand. Some of them measure 750 millimeters. The ])lant 

 at timberliue averages about (iO millimeters in height. 



Mr. Leiberg tells me that this species, although commonly referred 

 to 'oniati(s\ is not ornatus of Douglas. It has also been called L. 

 arficntens deciimbots Watson. 



Lupinus albifrons lienth. 



Collected near Horse Oamp August 20 by Vernon Bailey and Miss 

 Wilkins. (Identified by J. 1>. Leiberg. i 



Lupinus lyalli Gray. Dwarf Alpine Lui)ine. 



Abundant and widely distributed over the higher rocky pumice 

 slopes from timberliue or a little above u}) to an altitude of slightly 

 more than 10,000 feet. (Identified by J. B. Leiberg.) 



Lupinus minimus Dougi. Dwarf Lowland Lupine. 



Common in the Transition zone at Sisson. (Identified by .1. B. Lei- 

 berg.) 



Vicia americana ]\IuhI. 



Kather common at and below Wagon Camp. ;nid still in liowei' when 

 we left, September 25. 



Linum lewisi Pursh. Wild Hemp. 



Abundant at Wagon Camp, where its debcate blue fiowers were con- 

 spicuous in July, and its large subglobular seed ca])sules in September. 



Polygala cornuta Kellogg. 



Occurs plentifully in the dry pine woods of tiie Transition zone near 

 Sisson Tavern, but was not observed on the mountain proper. (Iden- 

 tified by Miss Eastwood.) 



Rhus trilobata Nutt. 



In going north from Sisson we first observed this species a mile or 

 two south of Edgewood, to the north and east of which it became more 

 and more (common. Its zone position here is along the borderland 

 between the Transition and U[)per Sonoran zones. 



Pachystima myrsinites Kaf. Oregon lioxwood. 



('ommon in the Transition zone at t!ie west base of Shasta, from Sis- 

 son up to an altitU(U' of about 4,700 ieet, usually in manzanita chajtar- 

 ral. Its absence from the higher slojx's within tlie ])roper zone limits 

 of the species is ]>rol)al)ly due to heat and <lryness. as exi)lained else- 

 where (p. 5()), but it is possible that the Sisson jilant is a Transition 

 zone subsi)ecies of Ihe trne iioreal /'. iiii/r.sinilrs. 



