PLANTS OF Farco, ETc. 137 
Juncus interior Wiegand. *PRAIRIE RUSH. 
Prairie. Frequent. 
Juncus torreyz Coville. 
Bolley in 1891. 
Araceae. Arum Family. 
Arisaema triphyllum (1.) Torr. JACK-IN-THE-PULPIT. 
Woods. Common. May Io. A 
Lemnaceae. Duskweed Family. 
Lemna trisulca \. : IVY-LEAVED DUCKWEED. 
Ponds and ditches. Common. 
Lemna minor \,. SMALL DUCKWEED. 
On ponds and river. Conunon. : 
Spirodela polyrhiza (1,.) Schleid. LARGE DUCKWEED. 
On river with the preceding. Stevens in 1919. 
Amaryllidaceae. Amaryllis Family. 
Hypoxis hirsuta (1,.) Coville. STAR GRASS. 
Low prairie. Lee in 18q1. 
Iridaceae. Iris Family. 
Sisyrinchium angustifolium Mill. BLUE-EYED GRASS. 
Prairie and uncultivated fields. Common. May 20 (18). 
Orchidaceae. Orchid Family. . 
Cypripedium candidum Willd. “SMALL WHITE LADY'S SLIPPER. 
Lee in 1891; L. R. Waldron in 1899. 
Coeloglossum bracteatum (Willd.) Parl. LONG-BRACTED ORCHIS. 
Woods. Occasional. May 20. 
Cyperaceae. Sedge Family. 
Cyperus erythrorhizos Muhl. 
Riverbank. Frequent. Aug. 5. 
Cyperus esculentus L. 
Riverbank (Oak Grove). A considerable colony, first collected 
by Stevens in rg18. 
Scirpus validus Vahl. GREAT BULRUSH. 
Sloughs, ditches and ponds. Common. June 25. 
Scirpus heterochaetus Chase. 
Ditches west of Agr. College. May 30. 
Scirpus paludosus A. Nels. PRAIRIE BULRUSH. 
More in low flat areas than the last or next. Common. 
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