65 



Order 80.— CERATOPHYLLACE.E. 99. 



1. Ceratophyllum, L. 



demersum, L. (Hornwort.) 



Ponds and ditches. Common. June. 



Order 81.— CALLITRICHACEJE. 100. 



1. Callitriche, L. 



verna, L. (Water Starwort.) 



Shallow pools and ditches. Common. April. 



Order 82.— PODOSTEMACEiE. 101. 



1. Podostemox, Michx. 



Ceratophyllum, Michx. (River- weed.) 



Attached to rocks and stones in the bottom of swift 

 shallow streams; Brandywine, &c. Frequent. 

 Aug. 



Order 83.— EUPHORBIACE.E. 102. 



1. Euphorbia, L. 



pol}*gonifolia, L. (Shore Spurge.) 



Sandy shores; Collins' beach. Frequent. July, 

 maculata, L. (Spotted Spurge.) 



Cultivated grounds, &c. Common. July, 

 hypericifolia, L. 



Pastures and roadsides. Common. July, 

 corollata, L. (Flowering Spurge.) 



Sandy soil and fencerows. Frequent. Aug. 

 Darlingtonii, Gray. 



Moist woods; S. of New Garden (J. Hoopes). Rare. 

 May. 



2. ACALYPHA, L. 



Yirginica, L. (Three-seeded Mercury.) 

 Fields and open woods. Common. July. 



3. Ricinis, L. 



communis, L. (Castor-oil plant.) 



Sometimes spontaneous about gardens. June. 



