64 Class V. Order I. 



POTAMOGETON PAUCIFLORUM. Short headed Pond weed. 



Leaves sessile, linear, flat ; heads about flour flow- 

 ered. 



This species is not spiked, the flowers forming a little ter- 

 minal head or whorl, a few together. July. 



69. RUPPIA. 



RUPPIA MARITIMA. -L. Sea Ruppia. 



An immersed, grass like plant, of salt water ditches and ponds. 

 Leaves linear, all under the surface. Spike or head above 

 water, about four flowered. Seeds four or five on pedicels. 

 South Boston, &c. July. 



Class V. PENTANDRIA. Five stamens. 



Order I. MOJVOGYJVM. One style. 

 A. Flowers monopetalous, inferior, with four naked seeds. 



70. ECHIUM. Corolla irregular, bell shaped, with 

 the throat naked ; stigma two cleft. 



71. LITHOSPERMUM. Corolla infundibuliform 

 with the throat naked ; calyx five parted. 



72. LYCOPSIS. Corolla infundibuliform with a 

 curved tube ; its throat closed with convex scales. 



73. CYNOGLOSSUM. Corolla funnel form, the 

 throat closed with arched valves ; seeds depressed, 

 fixed laterally to the style. 



74. MYOSOTIS. Corolla salver shaped, five cleft, 

 lobes slightly notched ; throat closed with concave 

 valves. 



B. Flou-ers monopetalous, inferior ; seeds in a vessel. 



75. HYDROPHYLLUM. Corolla campanulate with 



