ASTERACEAE: HELEXIEAE 187 



Achene densely villous, pappus as long as the width of the achene. 



2. H. tenuifolius. 

 Corolla yellow, heads 12-25 mm. broad; perennials. 3. H. filifolius. 



1. Hymenopappus corymbosus T. & G. 

 Nebraska according to Britton's Manual. 



2. Hymenopappus tenuifolius Pursh. 



Common in sandy soil. Anselmo; Dismal River; Foster; Franklin; 

 Phelps County; Valentine. 



3. Hymenopappus filifolius Hook. 



Common in dry sandy prairies. Broken Bow; Box Butte County; 

 Deuel County; Cedar County; Merriman; Mullen; Pine Ridge; Sioux 

 County; Thedford. 



2. Polypterls. 1007. 



1. Polypteris hookeriana (T. & G.) A. Gray. 



On dry prairies in the western part of the state. Hat Creek Basin; 



Lincoln; Whitney; Royal. 



3. Picrideniopsis. 1008. 



1. Picrideniopsis oppositifolia (Nutt.) Rydb. 

 Whitney. 



4. Tetraneuris. (Picradenia.) 1008. 



Leaves with narrowly linear blades, 1-2 mm. wide, involucre 10-13 mm. 



wide. I.T. stenophyiia. 



Leaves linear or linear-lanceolate 2-6 mm. wide, involucre 15-35 mm. 



wide. 



Scapes few, leaves 4-7 cm. long. 2. T. simplex. 



Scapes tufted, leaves 3-5 cm. long. 3. T. acaulis. 



1. Tetraneuris stenophyiia Rydb. 



In dry soil in the western part of the state. Franklin. 



2. Tetraneuris simplex A. Nelson. 



Western Nebraska according to Britton's Manual. 



3. Tetraneuris acaulis (Nutt.) Greene. 



In dry soil in the western part of the state. Alliance; Belmont; 

 Banner County; Harrison; Scotts Bluff; Sioux County. 



5. Helenium. 1010. 



1. Helenium autumnale L. Sneeze-weed. 



In wet meadows and along streams and ditches. Bellevue; Dismal 

 River; Ft. Kearney; Plainview; Newark; Plattsmouth; Scotts Bluff 

 County; Valentine. 



6. Gaillardia. 1011. 



1. Gaillardia pulchella Foug. 



In dry soil in the western part of the state. Franklin; Lincoln; Red 



Cloud; Riverton. 



