MICHIGAN FLORA. 



491 



Water-Star- 

 wort. 



Water-Star, 

 wort. 



SAURURACEtE. 



(Lizard' s-tail Familij.) 



SAURURUS 



Lizard's-taii. 963. cernuus, L. (***) C. & S. 



Swamps. Common. 



CERATOPHYLLACE^E. 



(Hormvort Family.) 



CERATOPHYLLUM 



Hornwort. 964. demersum, L. Th. 



Ponds. Fruit in August. Common. 



OALLITRICHACE^E. 



(Water -Starwort Family.) 



CALLITRICHE 



965. verna, L. (***) Th. 



Ponds. Macomb Co., to Lake Superior. 



966. autumnalis, L. 



Rivers. Flint— Dr. Daniel Clark; to Lake Superior— Gray. 



PODOSTEMACE^E. 

 (River-weed Family.) 



PODOSTEMON 



Eiver-weed. 967, ceratophyllus, Michx. 



Dr. A. B. Lyons. 



EUPHORBIACE^E. 



(Spurge Family.) 



EUPHORBIA 



Shore spurge. 968. polygonifolia, L. Th. 



Sandy shores of the Great Lakes. S. Haven — Bailey; Ft. Gratiot— 

 Winch. Cat., etc. Frequent. 



969. maculata, L. (***) 



Roadsides and fields, everywhere. One of the few northern plants, 

 observed by Prof. A. N. Prentiss in Brazil. 



970. hypericifolia, L. (***) 0. & S. 



Cultivated soil, and waste places. Detroit— Dr. A. B. Lyons; Ionia (!); 

 Grand Rapids (!); Lansing— Bailey. Infrequent. 



971. corollata, L. (**) C. & S. 



Sandy soil. A weed difficult to eradicate on account of its deep roots. 

 Beginning to be cultivated by gardeners for its abundant, small, white 

 flowers. Its milky juice is acrid-poisonous. 



972. platyphylla, L. 



Macomb Co. ; "Along the Great Lakes."— Gray. 



973. Helioscopia, L. (***) 



Common at Detroit— Dr. A. B. Lyons. 



974. commutata, Eugelm. 



Ann Arbor.— Winch. Cat.; Flint. 



Spotted 

 Spurge. 



Flowering 

 Spurge. 



