VASCULAR PLANTS OF NORTH DAKOTA 237, 
Leeds, Towner, Minot; Mandan (Bergman). 
249. Carex atherodes Spreng. Syst. 3: 828. (1826). 
Leeds. ; 
250. Carex hystricina Muhl., Willd. Sp. Pl. 4: 282. (1805). 
Pleasant Lake, Towner. 
251. Carex rostrata Stokes, With. Arrang. Brit. Pl. (2 ed.) 
2.11059. (1787). 
252. Carex rostrata Stokes, var. utriculata (Boott.) Bailey, 
Proc. Am. Acad. 22: 67. (1886). 
Leeds, Sheyenne, Towner. 
253. Carex retrorsa Schwein, Ann. Lyc. N. Y. I: 71. (1824). 
Along Oak Creek at Bottineau; Renville Co.: Tolley (O. 
A. Stevens). 
Order 10. LEMNALES. 
Family 15. LEMNADEAE S. F. Gray, Nat. Arr. Br. Pl. 
mp. 729., (1821). 
HYDROPHRACE Haller, Helv. 3: 68. (1768). 
Lemna Dalechamps (1580), Linn. Syst. (1735), Gen. 325. 
(1737) and 417. (1754), Sp. Pl: 970. (1753), not Lemma or Lemna 
Theophr. = Marsilea vulgaris Linn. 
254. Hydrophace trisulca (Linn.) Bubani, Fl. Pyr. IV, 
p- 23. (1907). 
Lemna triculca Linn. Sp. Pl. 970 (1753). 
Leeds, Butte. 
255. Hydrophace perpusilla (Torr.) Lunell. 
Lemna perpusilla Torr. F'. N. Y. 2: 245. (1843). 
Butte; Fargo (L. R. Waldron and F. F. Manns). 
Order 11. AROIDEAE. 
Jussieux Gen. Pl. 23. (1789). Bartling, Ord. Nat. Pl. 25. (1830). 
Family 16. ARACEAE Necker, Act. Acad. Theod. Palate 
2: 462. (1770). 
ARISAEMA Martius, Flora 14: 459. (1831). 
mem Ling. Syst..(1735),,Gen: Pl. 277... (1737), 43040752): 
Sp. Pl. 964. (1753), in part. 
256. Arisaema triphyllum (Linn.) Torr. Fl. N. Y. 2: 239. 
(1843). . 
Arum triphyllum Linn. Sp. Pl. 965. (1753). Fargo (Bergman). 
Order 12. XYRIDALES. 
Britton, Man. 2nd ed. p. 234. (1905). 
