88 CON 



calyx ovate with spiderweb-like pubescence ; scales lan- 

 ceolate, spinose, spreading, discolor, altis&iiiws vtall 

 thistle.) arvensis (canada thistle.) horriduhts. muticus. 



151. COCiiLEARIA, 39. 63. 



offic'nnlis (scurvy grass.) armoracia (horse radish. E 

 w J. ?_f.) radical leaves lanceolate, crenate j cauline 

 ones gashed. 



SO 3. C01X, 4, 10. 

 lackryma (job's teat 1 .) 



141. COLLINSBNIA, 42. 39. 

 eanadtus'S (horse balrn> rich- weed, y. Au. if.) leaves 

 heart-oval : teeth of the calyx short, subulate, about equal 

 to the tube. 



1710. COLUTEA, 32. 93. 

 arloresvens (bladder senna.) vesicaria (E. y. Ju.) 

 1213. COMARUM, 35. 92. 



palustre (marsh fivefinger. p. Ju. if.) leaiets in threes, 

 fives or sevens, serrate. 



51, COMMELINA, 6. 13. 



communis (day-flower.) erecta- virginica (long-leav- 

 od day flower.) 



20^3. COMPTONIA. 50. 99. 



asplenifolia (sweet fern.) 



224. CONFERVA, 57. 2. 



rivHlaris, black-green, closely compacted and often 

 twisted, joints shortish, "velutina, green entangled, erect, 

 vshort, slender, obtuse, joints short and slightly swelling. 

 flu-viatilis (river greenhair.) divisions rather rigid, 

 mostly alternate, tape ring to both ends : joints long, di- 

 lated 2- ways, partitions warty, swelled, glomcrata, 

 branches alternate ; branchlets one-way, fascicled pencil- 

 form : joints cylindric, rather long : partitions pellucid. 

 diaphana . 



52. CONIUM, 45. 60. 



maculatum (poison hemlock.) 



61. CONOSTYLJS. 



americana ^weed-grass.) 



