1921] Smiley: Flora of the Sierm Nevada of California 269 



40. HA1,0RAGIDACEAE (Water Milfoil Family) 

 1. HIPPURIS 



1. Hippuris vulgaris L., Sp. PL, p. 4. 1753. 



Type locality. — "Habitat in Europae fontibus. " 



Range. — Holarctic realm; in America south to New England, New 

 York, Indiana, Nebraska, New Mexico, and California. 



Zone. — Transition and Canadian. 



Specimens examined. — Lily Lake, Tahoe, 6,600 feet. Smiley 329 ; 

 Tuolumne meadows, Yosemite, in pools behind Parsons Lodge, 8,600 

 feet. Smiley 748. 



41. ONAGRACEAE (Evening Primrose Family) 



Fruit indehiscent, 1-2 seeded, and bristly with hooked hairs; flowers 2-meroiis 



1. Circaea 



Fruit a many seeded capsule opening by valves; flowers 4-merous. Seeds with- 

 out a coma 2. Oenothera 



Seeds comose (i.e. with a tuft of hairs at one end). 



Calyx green, herbaceous 3. Epilobium 



Calyx deep red or purple 4. Zauschneria 



1. CIRCAEA 



1. Circaea alpina L., Sp. PL, p. 9. 1753. 



Type locality. — "Habitat ad radices montium in frigidis Euro- 

 pae." 



Range. — Holarctic realm ; in America south in the Appalachians to 

 Georgia ; in the Rocky Mountains to New Mexico ; and in the Cascade- 

 Sierra axis to California? 



Zone. — Canadian. 



Specimen examined. — Pyramid Peak, Brewer 2133 ; this specimen 

 has been referred to C. pad flea A. and M. (Bot. Zeit., vol. 29, p. 392. 

 1871), a common species in the Transition Zone in the Sierra, but 

 examination shows the racemes bracted and leaves toothed as in the 

 more northern and eastern form ; more material is necessary before 

 fully accepting C. alpina as a species of our boreal flora. 



