88 University of California Puhlications in Botany [Vol.9 



7. SPARGANIACEAE (Bur-Reed Family) 

 1. SPARGANIUM 



1. Sparganium angustifolium Michx., Fl. Bor. Am., vol. 2, p. 189. 



1803. 



S. amerieanum Nutt., Gen., vol. 2, p. 203. 1818. 



S. simplex var. angustifolium Engelm., in Gray, Man. ed., vol. 5, p. 481. 



1867. 



Type locality. — "Hab. in amnibus Canaclae. " 



Range. — Subarctic America south to New England, New York, 

 Colorado, and California. 



Zone. — Transition to Hudsonian. 



Specimens examined. — Kaweali meadows, Tulare County, growing 

 in ponds at 9,200 feet, Purpus 5670; pools in granite south of Lake 

 Tenaya, Yosemite, 8,300 feet, Smiley 684, 



S. B. Parish (Erythea, vol. 6, p. 85. 1898) reports this from 

 the San Bernardino Mountains. 



There is another Sparganium growing in the Sierra which has 

 been referred to S. simplex Huds. and also to S. minimum Fries, from 

 both of which species it shows material differences. Its definitive 

 assignment or description must be deferred till more material is avail- 

 able for comparison. 



8. NAJADACEAE (Pondweed Family) 

 1. POTAMOGETON 



Plants V7ith no floating leaves; the leaves short petioled or sessile. 



Leaves linear-filiform 1. P. pusillus 



Leaves broadly ovate 2. P. praelongus 



Plants with both floating and submerged leaves; the leaves usually distinctly 

 petioled, often long petioled. 



Foliage and spikes reddish; stems mostly simple 3. P. alpinus 



Foliage and spikes green; stems branching below 4. P. heterophyllus 



1. Potamogeton pusillus var. tenuissimus Mert. and Koch, 

 Deutsch. Fl., vol. 1, p. 857. 1823. 



Type locality. — European. 



Range. — North temperate zone in the cooler parts; in California, 

 this form has been found only in the high Sierra. 



Zone. — Canadian ? 



Specimen examined. — Soda Springs, near head of the Tuolumne 

 River, Bolander, September, 1866. 



