54 University of California Puhlications . [botany 



Pseudotsuga macrocarpa {Torr.) Lemmon. Big-cone Spruce. 

 Common in well watered canons of the west side just below 

 the Yellow Pine belt. (See p. 20.) 



POTAMOGETONACE JH] . 



Potamogeton Claytoni Tucl-erm. Pondweed. 



Collected only in the quiet waters of Lake Surprise, altitude 

 9000 ft., where it is abundant. (No. 2490.) 



GRAMINE^. 



[Note. — For the determination of the plants of this difficult 

 order the author is under obligations to Mr. Joseph Burtt Davy, 

 of the University of California. Wherever a ucav species or 

 variety is described, the author of the new name is also author 

 of the description and notes following.] 



Agropyron tenerum Vas. Slender Wheat-grass. 



Collected in Dark Caiion at 7000 ft. alt. (No. 2569.) 



Agropyron caninum L. 



Thomas Valley, at 4500 ft. alt.; Fullers Ridge, at 7000 ft. 

 alt. (Nos. 2174, 2555.) 



Agropyron Parishii laeve IScrilni. d- Smith, U. S. Dept. Agr. 



Agros. Bull. iv. 28 (1897) (?) 



A grass which is probably of this variety was collected in 

 imperfect condition on the West Fork of Snow Creek at abovit 

 5000 ft. alt. (No. 2541.) 



Agrostis Diegoensis IV/.s-., P>ull. Torr. Clul) xiii. 55 (bS80) . San 



Diego Bent- grass. • 



On hillsides beneath the pines and also on stream l)anks at 

 5000-6000 ft. alt. (Nos. 2209, 2375.) 



Agrostis tenuis Vas., Bull. Torr. Club x. 21 (1888). 



This delicate grass is plentiful in meadows and around springs 

 at 7500-9000 ft. alt., wherever there is abundant moisture. In 

 some of the Tahquitz meadows it is the dominant grass. (Nos. 

 2363, 2476, 2533, 2570.) 



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