152 NORTH AMERICAN FAUNA. [No. 16. 
pines in a shallow gulch at the east base of the lava buttes just below 
‘North Gate.” The upper limit of the silvery lupine usually coincides 
with the lower limit of the dwarf lupine (L. lyalli), which species gen- 
erally pushes from this point upward through the Alpine 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 thesand. Some of them measure 750 millimeters. The plant 
at timberline averages about 60 millimeters in height. 
Mr. Leiberg tells me that this species, although commonly referred 
to ‘ornatus’, is not ornatus of Douglas. It has also been called L. 
argenteus decumbens Watson. 
Lupinus albifrons Benth. 
Collected near Horse Camp August 20 by Vernon Bailey and Miss 
Wilkins. (Identitied by J. B. Leiberg.) 
Lupinus lyalli Gray. Dwarf Alpine Lupine. 
Abundant and widely distributed over the higher rocky pumice 
slopes from timberline or a little above up to an altitude of slightly 
more than 10,000 feet. (Identified by J. B. Leiberg.) 
Lupinus minimus Dougl. Dwarf Lowland Lupine. 
Common in the Transition zone at Sisson. (Identified by J. B. Lei- 
berg.) 
Vicia americana Muhl. 
Rather common at and below Wagon Camp, and still in flower when 
we left, September 25. 
Linum lewisi Pursh. Wild Hemp. 
Abundant at Wagon Camp, where its delicate blue flowers were con- 
spicuous in July, and its large subglobular seed capsules in September. 
Polygala cornuta Kellogg. 
Occurs plentifally in the dry pine woods of the Transition zone uear 
Sisson Tavern, but was not observed on the mountain proper. (Iden- 
titied 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 Upper Sonoran zones. 
Pachystima myrsinites Raf. Oregon Boxwood. 
Common in the Transition zone at the west base of Shasta, from Sis- 
son up to an altitude of about 4,700 feet, usually in manzanita chapar- 
ral. Its absence from the higher slopes within the proper zone limits 
of the species is probably due to heat and dryness, as explained else- 
where (p. 56), but it is possible that the Sisson plant is a Trausition 
zone subspecies of the true Boreal P. myrsinites. 
