128 THE FLORA OF NEBRASKA. 



630-810 (i long, about 300 /i broad, several sharp prongs at the base; bracts 

 at the fertile joints variable in length, usually somewhat shorter than the 

 carpogone. 



Whitman, lakes in central Cherry county. 



PI. XXXV. Figs. 1, 1 a, parts of plants natural size; Fig. 2, part of stem show- 

 ing bases of leaves of a whorl and two fertile nodes; 2 b, stipular whorl; 

 2 a, remainder of leaf shown in 2; Fig. 3, carpogone containing spore; 

 Fig. 4, cross-section of stem, x50. 



< liaia sejnncta A. Br. PI. Lindh. 56. (Bost. Journ. Nat Hist. 1845 p. 263.) 



General habits of C. fragilis; stem triply corticated; leaves long, in whorls of 

 8-12, with 6-10 segments, the lowest or first segment short, not corticated, 

 all the others corticated, last segment tipped with several short spines; 

 stipular whorl well developed, of 3 series of stipules, spines on the stem 

 short and sharp; monoecious, but antherids and carpogones borne at dif- 

 ferent joints, not together; antherids about 360-380 /i in diam.; spore of 

 carpogone 630x360 fi, crown of long, narrow cells spreading or connivent. 

 Minden. 



PL XXXVI., Fig. 1, part of plant natural size; Fig. 2, part of stem showing 

 lower naked segments of the leaves of a whorl and stipular ring, 2, a, b, 

 c, leaf with fertile nodes; Fig. 3, cross-section of stem, 3a, spine, x50. 



