(325) 



1. L. SUBULATA HBK. San Francisco. 

 School House Station. Searsville. Spring. 



2, Zoster a L. EEL-GRASS. 



Flowers monoecious. Spathe elongated into 

 a lamina. Spadix flattened, dorsally naked, 

 ventrally covered by alternate stamens and 

 ovaries arranged in two rows. Anthers 1-celled, 

 sessile. Ovary rostrate. Style persistent. 

 It . Stems and roots submerged. 



1. Z. MARINA L. Brackish inlets around the 

 bay. Summer. 



The bulbous root is edible, and is eagerly 

 sought for by the canvas-back duck. 



Family 2, LEMNACE.E, 



Aquatic plants without axis. Flowers en- 

 closed in a thin membranaceous spathe. Sta- 

 mens 1 or 2. Ovary sessile, i-celled; ovules 

 1-6; style short. Fruit a utricle. 

 1, Lemna L- DUCKWEED. 



Stamens 2. 



1. L. TBISULCA L. Ovule solitary; fronds 

 oblong, stalked, remaining connected. Presi- 

 dio. Autumn. 



2. L. VALDIVIANA Philippi. Ovule solitary; 

 fronds not stalked, soon separating; bract reni- 

 form. Marine Hospital. Autumn. 



