(321) 



5. Eriophorum L- Cotton-Grass. 



Spikelets v , cc-Howered. Palets imbricate 

 all round, the lowermost empty. Perigonium 

 oo-setaceous, in fruit exserted, and silky. — U . 



1. E. GRACILE Koch. — San Francisco. Sum- 

 mer. 



Aquatic ; formerly found in a swamp near the 



mouth of Mission creek. Not yet rediscovered 



in our neighborhood, but frequent in the higher 



Sierras. 



6. Cyperus L 



Spikelets ^ . Palets imbricate, distichous, 

 the lowermost empty. Perigonium 0. Inflor- 

 escence involucrate. 



1. C. DIANDEUS Torr. Style 2-cleft; nutlet 

 lenticular, the edge turned to the rachis of the 

 spikelet. — 0. San Francisco. Summer. 



2. C. AEISTATUS Eottl. Style 3-cleft; nut- 

 let triquetrous. Floret monandrous. — 21 . Com- 

 mon. Spring. 



Order 5. SPADICIFLORiE. Inflorescence 

 a spadix surrounded by a spathe. Bracts de- 

 pauperate. Ovary superior, one to several- 

 celled; cells 1-ovulate. Leaves alternate with 

 sheathing base. 



Family 1. TYPHACE^. 



Flowers diclinous, in a sometimes interru])ted 

 club-shaped spadix, eacli division of which is 

 14a 



