144 FLORA OF MICHIGAN. 



1257. var. aiulrocladum, Engelm. 

 Ann Arbor, Allmendinger Cat. ; Flint, Dr. Clark; Macomb Co. 



1258. var. angustifolium, Engelm. 



Isle Royale, Whitney Cat.; Keweenaw Co., F.; N. shore of Lake Superior, Agassiz. 



1259. S. minimum, Fries. 



Hubbardston; Manistee, E. J. Hill ; Macomb Co.; Homestead, Benzie Co. ; Keweenaw Co., FarwelL 

 Rare. 



OIL AKACE^E. ARUM FAMILY. 



447. ARIS.^EMA, Martius. INDIAN TURNIP. DRAGON ARUM. 



*1260. A. triphyllum, Torr. Indian Turnip. Th. 



Rich woods. 



* 1261. A. Dracontium, Schott. Green Dragon. Dragon- root. C. & S. 

 Low grounds. Infrequent. 



448. PELTANDRA, Raf. ARROW ARUM. 



*1262. P. uiululata, Raf. C. & S. 



S. Mich., Wright Cat.; Huron River, Allmendinger Cat.; Ionia Co.; Flint. 



449. CAL.LA, L. WATER ARUM. 



*1263. C. palustris, L. Th. 



Bogs. Frequent. 



45O. SYMPLOCARPUS, Salisb. SKUNK CABBAGE. 

 *1264. S. foeticlus, Salisb. Th. 



451. ACORUS, L. SWEET FLAG. CALAMUS. 



*1265. A. Calamus, L. Th. 



Margin of streams. Infrequent. 



GUI. LEMNACE.E. DUCKWEED FAMILY. 



452. SPIRODELA, Schleiden. 



*1266. S. polyrrhiza, Schleid. 

 Ponds. Common. 



453. LEMNA, L. DUCKWEED. DUCK'S-MEAT. 



*1267. L. trisulca, L. C. & S. 



Ponds. Frequent. 



1268. L. perpusilla, Torr. C. & S. 



Detroit River, D. H. Campbell; Dr. A. B. Lyons. Rare. 



*1269. L. minor, L. Th. 



Ponds. Blossoms occasionally in June. Common. 



454. WOLFFIA, Horkel. 



1270. W. Columbiana, Karsten. 



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



1271. W. Brasiliensis, Weddell. 



With the last. Nearly covering the surface of ponds and slow streams in July. 



