Botany of lilinois and Missouri, 175 
Sium tricuspidatum E 7 7. 
Stem 2 or 3 feet high, very smooth, sparingly branched. 
Leaves pinnate, 3 or 4 pairs, with an odd one. Leafets lan- 
ceolate, acute, somewhat rigid, from 2 to 4 toothed : ; teeth 
une 2 nvolucrum caducous. 
: wamps west of St. Louis. June—J uly. 
Acoanine to Mr. Elliott this is S. rigidius of Walter, and 
differs from S. rigidius of Linnzeus, in the leaves, which are 
almost 3-cuspidate, and in the seeds, which are more slightly 
winged. 
Thaspium aureum N u ¢ ¢. Has. Wet grounds 
Thaspium barbinode WN u ¢ t. } near St. Louis—May. 
Myrrhis canadensis N u ¢ t. 
er leaves sometimes nearly biternate. General invo- 
ducre wantin artial one consisting of one or 1 ; 
almost sable leaves. Styles persistent, erect, at length 
divaricate. 
sot Shady alluvions of the Illinois and Mississippi. 
June 
Myrrhis longistylis Torre y. , 
Stem hairy at the joints and near the root. Unmbels with 
3—5 rays. Lower leaves sometimes on long petioles. 
Styles linear, — long. 
- Has. In company with the last. June. 
The only ‘stactive character of this plant is the length of 
the styles ; if this is constant, it is perhaps sufficient to war- 
rant its erection into a new species. The other characters 
noticed by Dr. Torey are very variable, both in the eastern 
and western specim Dr. Bigelow, in the last edition of 
his Flor. Bost. also "divides M. claytoni of Mich. but his 
descriptions are quite different from those of Dr. Torrey. 
Smyrnium cordatum /¥ a lt. 
Has. Wet grounds—common. May. 
Sm myrnium integerrimum Li ne 
Has. In company with the last. 
