Family ASTERACEA# 189 
Outer bracts 12-20, longer than the inner, coarsely hispid. 
9. B. involucrata. 
1. Bidens levis (L.) B. S. P. Smooth Bur-marigold. 
In meadows and along streams. Ainsworth; Banner county; Grand 
Island; Lawrence Fork; Lincoln; Mullen; Nebraska City; Roca. 
2. Bidens cernua L. Nodding Bur-marigold. 
Common in wet soil throughout the state. Callaway; Ewing; Gree- 
ley; Lincoln; Newark; Roca. 
3. Bidens comosa (A. Gray) Wiegand. Pitchforks, Tickseed. 
In moist soil in the eastern part of the state. Kearney; Kennedy; 
Lincoln; Nebraska City; Red Cloud; Thedford; Valentine. 
4. Bidens connata Muhl. Swamp Beggar-ticks. 
In swamps or moist soil. Nebraska, according to Britton & Brown. 
5. Bidens frondosa L. Black Beggar-ticks. 
Common in wet soil over most of the state. Kearney; Kennedy; 
Lincoln; Nebraska City; Red Cloud; Thedford; Valentine. 
6. Bidens bipinnata L. Spanish Needles. 
Weeping Water. 
7. Bidens trichosperma (Michx.) Britton. Tall Tickseed. 
Common in stream-marshes over most of the state. Black Island; 
Keyapaha county; Long Pine; Royal; Thedford. 
8. Bidens aristosa (Michx.) Britton. 
Long Pine; Nebraska City; Valentine. 
9. Bidens involucrata (Nutt.) Britton. 
In wet soil. Endicott; Falls City; Nemaha. 
11. Thelesperma. 1003. 
Rays cae pappus scales not much longer than the width of the 
achene. 
Leaves not rigid, their segments filiform. 1. T. trifidum. 
Leaves rigid, their segments linear or filiform; perennial. 
2. T. intermedium. 
Rays small or wanting, pappus awns longer than the width of the 
achene. 3. T. gracile. 
1. Thelesperma trifidum (Poir.) Britton. Nipple-seed. 
In dry soil in the western part of the state. Box Butte county; 
Crawford; Long Pine. 
2. Thelesperma intermedium Rydb. 
In dry soil in the western part of the state. Alliance; Banner 
county; Crawford. 
3. Thelesperma gracile (Torr.) A. Gray. 
In dry soil, common in western part of the state. Cherry county; 
“eee River; Franklin; Kearney; Red Cloud; Shelton; Thedford; 
alentine. 
Tribe 9. AMBROSIEZ. 
Staminate and pistillate flowers in the same heads, the pistillate 
marginal. i. Iva; 
Staminate and pistillate flowers in separate heads, the pistillate 1-4 
in a nut-like or bur-like involucre. 
Involucre of the staminate heads of united bracts, that of the 
pistillate never with hooked bristles. 
