I08 UNIVERSITY OF MISSOURI STUDIES [^50 



203. 0. glaucodea Tuckerm. 

 Ravines and stream-beds; scarce. 



Massachusetts and Virginia to Missouri and Arkansas. 



204. C.a>inphiho\aSteud.]^C.gnseaangustt/o/ta'Boott: C^ 

 grisea (?) rigida Bailey]. 



Thickets east of Providence bridge; rare and local. 

 New Jersey to Iowa; Florida to Texas. 



205. O. grisea Wahl. 



Moist grassy places in woods; common. 



Maine to Minnesota; North Carolina to Kansas. 



206. 0. Davisii Schwein. & Torn 



Low meadows and fence-rows; common. Very variable 

 both in the length of the spikes and in the degree of inflation 

 of the perigynium. 



Massachusetts to Minnesota; Georgia to the Indian. 

 Territory. 



207. O. Caroliniana Schwein. \_C. triceps Smii/iu (Porter) 

 Bailey]. 



Dry open places; rare. 



New Jersey and Michigan to Missouri; North Carolina 

 to Arkansas. 



208. O. triceps Michx. [C triceps hirsiita (Willd.) Bailey]. 

 Very common in grassy copses and in wild meadows. 

 Massachusetts to Michigan; Florida to Texas. 



209. O. lupulinaMuhl. 



Swamps; local. 



Hudson Bay to Florida and Texas. 



209a. O. lupulina pedunculata Dewey. 

 Swamp at Brushwood lake. 

 Range of the type. 



210. O. utriculata Boott. 



Swampy creek-borders at the Pinnacles. 

 Anticosti to British Columbia; Delaware to Califor- 

 nia. 



