68 MICHIGAN ACADEMY OF SCIENCE. 



Hubbardston; Flint; IMacomb Co., and northward; Alma, Ann Arbor, C. A. Davis. 

 Frequent. 



*593. C. umbellata Schk. Umbel-like Sedge. Grand Ledge, C. F. Wheeler; Kewee- 

 naw Co., O. A. Farwell; Manistee, F. P. Daniels. Rare. 



594. C. umbellata vicina Dewey. Alcona Co.; Keweenaw Co., 0. A. Farwell; Grand 

 Ledge, C. F. Wheeler; St. Clair Co., C. K. Dodge. 



*595. C. utriculata Boott. Bottle Sedge. Swamps. Common. Th. 

 576. C. varia Muhl. Emmons' Sedge. Barron Lake; New BuflFalo; Monroe Co.; 

 dunes of South Haven, L. H. Bailey; Oscoda Co.; Crawford Co.; Grand Traverse, Winch. 

 Cat.; Keweenaw Co., O. A. Farwell. 



597. C. virescens ISluhl. Dewey. Green Sedge. Detroit, O. A. Farwell; Wayne, 

 C. A. Davis. 



598. C. viridula Michx. Green Sedge. C. flava wrichila Bailey. Margins of lakes. 

 Frequent. Th. 



*599. C. vulpinoidea Michx. Fox Sedge. Low meadows. Common. Th. 

 600. C. Willdenovii Schk. Willdenow's Sedge. Bear Lake, Van Buren Co., E. J. 

 Hill. Rare. 



ARACE.S Neck. Arum Family. 

 ARISAEMA Mart. 



*601. A. Dracontium (L.) Schott. Green Dragon. Dragon-root. C. & S. 

 *602. A. triphyllum (L.) Torr. Indian Turnip. Rich woods. Th. 



PELTANDRA Raf. 



*603. P. Virginica (L.) Kunth. Green Arrow-arum. P. nndulata Raf. S. Mich., 

 Wright Cat.; Huron River, Allmendinger Cat.; Ionia Co.; Bay Co., G. M. Bradford; 

 Flint. C. & S. 



CALLA L. 



*604. C. palustris L. Water Arum. Bogs. Frequent. Th. 



SPATHYEMA Raf. Stmplocaepus Salisb. 

 *G05. S. foetida (L.) Raf. Skunk Cabbage. Symplocarpus foetidus Nutt. Th. 



ACORUS L. 

 *606. A. Calamus L. Margin of streams. Infrequent. Th. 



LEMNACEiE Dumort. Duckweed Family. 

 SPIRODELA Schleid. 

 *607. S. polyrhiza (L.) Sclileid. Greater Duckweed. Ponds. Common. 



LEMNA L. Duckweed. Duck's-meat. 



*608. L. minor L. Lesser Duckweed. Th. Ponds Blossoms occasionally in June. 

 Common. 



609. L. perpusilla Torr. Minute Duckweed. Detroit River, D. H. Campbell; Dr. 

 A. B. Lyons. Rare. C. & S. 



*610. L. trisulca L. Ivy-leaved Duckweed. Ponds. Frequent. C. & S. 



WOLFFIA Horkel. 



6n. W. Columbiana Karst. Columbia WolfBa. Abundant on Maple River, Clinton 

 Co.; Ionia Co.; Detroit. J. M. Bigelow. 



612. W. punctata Griseb. Brazil Wolffia. W. Brasiliensis Engelm., not Wedd. 

 Abundant on Maple River, Clinton Co.; Ionia Co.; Detroit, J. M. Bigelow; Bay Co., 

 G. M. Bradford. 



