17 



and the rounded or narrow sinuses reaching: often nearly to the mid- 

 rib, it is the more prevalent northern form, Q, ohtusiloha^ var. depressa^ 

 Is^utt., and var, Utahensis, A. DO. The extreme forms appear quite 

 distinct, but intermediate forms abound, and there seems to be noth- 

 ing in the flowers or fruit to distinguish them. 



QuEi^cus Emokyi, Torr., Evxorifs Rep. 152, t. 9- (<?- pitngens^ Liebm.) 



QuERCUS OBLONGiroLiA, Torr., Sitgreave^s Rep. 173, t. 19. (Q. 

 grisectj Liebm.) 



QuEKCUS HASTATA, Liebm., BC. Prodr. IG. 2. 36. (? Q. herheridifoJia^ 

 Liebm.) Numerous specimens from Southern Nevada and Northern 

 Arizona, mostly without fruit, very variable in the characters of the 

 foliage, seem to be referable to these three best-marked species of 

 the oaks of that region. Q. hastata is most clearly distinguishable 

 by the thin flattened obtusely rhomboidal and smoothish scales of 

 the cup. The two former have more thickened convex scales, but are 

 perhaps not distinct. The size, toothing and pubescence of the 

 leaves are very variable. 



Betula occidentalis, Hook. Northern Nevada and Utah. 



Aenus incana, Willd , var. CtEAUCA, Ait, Arizona and Utah. 



Alnus oblongieolta, Torr-, Bot. Mex. Bound. 201. Arizona. 



PopuLUS MONiEiFEKA, Alt. Nevada. 



PopuLiTS BALSAMiFEKA, L., var. ANGUSTiEOLiA, Watson. Nevada and 

 Utah. 



PopuLUS TRE3IULOIDES, Michx. Sau Francisco Mountains, Arizona. 



Salix longifoeia, Muhh Nevada and Utah. 



Salix Nevadensis, Watson, Amer. Naturalist^ 7. 302. New species. 

 Aments short, 6-8 lines long, appearing with the leaves, ascend- 

 ing on leafy peduncles; scales oblong, obtuse, glabrous, or suh>ilky 

 in the male aments, light-colored ; stamens 2, free ; cai)sules ghihrous 

 even when young, on pedicels ^ line long; style none, stigmas 

 short and thick; leaves lance-linear, ^1 inch long on flowering 

 specimens, acuminate, entire, silky tomentose ; stipules very minute. 

 A slender shrub, S-i^ high, with light colored bark and yellowish 

 foliage, growing in dry sandy soil. It differs from S. Hbuhlana in its 

 more reduced habit, its silvery pubescence, narrower, more scarious, 

 lighter-colored and nearly glabrous scales, more slender and smoother 

 capsules, and thicker and shorter stigmas. Central Nevada. Col- 

 lected also by Watson (1093), at the base of the Washoe Mountains, 

 near Carson City. 



Salix cordata, MuhL, and a var. (?) (= 1096 Watson), Nevada. 



Salix (?) (= 1098 Watson). Furnace Creek, Nevadii. 



Ephedra aktisyphilitica, C. A. Meyer. Nevada and Utah. 

 PiNUS MONOPHYLLA, Torr. Belmont, Nevada. 

 PiNus EDrLis, Engelm. Arizona. 

 PiNUS PO^^DEROSA, Dougl. Arizoua and Utah. 



PiNUS Balfouriana, Murr. (P. aristata^ Engelm.) San Francisco 

 Mountains, Arizona, and Utah. 



Piisus FLEXiLis, James. Arizona. Also var. macrocarpa. '* Folia 

 subintegra raro hie inde serrulata apice integerrima; strobili squamae 

 obtuste rotundatiB paulo (^-1 lin.) projicientes; strobilus (ma^nus) 

 inde minus quam in specie squarrosus.'' Engelm.^ MSS- San Fran- 

 cisco Mountains. Arizona. 



Abies Engelmanni, Parry. Same locality. ^ 



Abies grAjN^dis, Lindl. i Arizoua. Foliage only. 

 Abies concolok, Lindl. Arizona and Utah. Foliage only. 

 Abies DouGLAsn, Lindl. Arizona. 



2b 



