LIST OF HIGHER SEED-PRODUCING PLANTS. 135 



Minn, valley : Forest district; probably throughout; 

 pools and ponds; floating on the surface. 



Herb. : ' Ballard 888, Lake Waconia ; Ballard 62 

 [parily), Chaska, Carver Co. 



(xrantia columbiaiia (Karst). 



Wolffia Columbiana Kakst. 

 Wats, and Coult., Gray's Man. 6 ed. 553; Britt., Fl. N. J. 255; Upham, 

 Fl. Minn. 135; Mac, Fl. Can. II, 76, 368 



North America: Ont., Conn, and N. J.'; to Minn., Mo. 

 and La. 



Minn, valley: Forest district; Waconia to Blue Earth 

 Co. ; ponds and pools; floating near the surface. 



Herb. : Ballard 62, Chaska; Oestlimd 182, Minnehaha. 



XII. XYRIDACEAE. Star-Eyed Grass Family. 



Endlicher, Gen. PI. 123 (1840); Benth. and Hook., Qen. PI. Ill, 841 

 (1883); Engler in Engler and Prantl, Nat. Pflanz. 2, IV, 18 (1887). 



Genera: 2; tropics and N. temperate America; large- 

 ly tropical. 



Species : 48 ± ; principally in tropical America. 



XYRIS Linn. Gen. 31 (1737). 



Scliizmaxon Steud. Bot. Zeit. 391 (1856). 

 Benth. and Hook., Gen. PI. Ill, 842; Durand, Ind. Gen. Pha,n. 433; 

 Engler and Prantl, Nat. Pflanz. 2, IV, 20 (Engler); Schenck, Palaeophyt. 

 366. 



Living species: 40; warmer regions, except Europe; 



principally N. and S. America. N. America, 20 ±; S. Sts., 18; 

 E. Sts., 4; Canada, 1. 



Fossil species : ? Tertiary, W. N. America (Lesquereaux) . 



Xyris flexuosa Muhl. Cat. 5 (1813). 



? X jupicai MiCHX. Fl. N. Am. I, 23 (1803) nom. dub. 

 X. bulbosa KviHTn, Enum. IV, 11 (1843). 

 X. scabra Eistgelm. Herb. Columbia Coll. 

 Wats, and Coult., Gray's Man. 6 ed. 537; Britt., Fl. N. J. 247; Upham, 

 Fl. Minn. 149; Mac, Fl. Can. II, 54; Chap., Fl. S. St. 500; Ries, Torr. 

 Bull. XIX, 37. 



North America: N. S.. Ont. (in var. '?), Mass. to N. J. 

 and Md. to Fla. ; W. to Minn., Mo., Ark. and Tex. 



Minn, valley: Reported from the N. E. district; rare 

 or doubtful; sandy or peaty bogs. 



Xm. ERIOCAULACEAE. Pipewort Family. 



Endlicher, Gen. PI. 122 (1840); Benth. and Hook., Gen. PL III, 

 1019 (1883); Hieronymus in Engler and Prantl, Nat. Pflanz. 2, IV, 21 

 (1887). 



