172 CAMPAXULALES 



Leaves mostly petioled, stems 1-2 dm. high, heads sessile. 



4. C. pumila. 

 Leaves sparingly hairy, decidedly viscid. 5. C. hispida. 



1. Chrysopsis villosa (Pursh.) Nutt. 



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

 Grand Rapids; Kiwa Valley; Meadville; Mullen; Whitman; Valentine. 



2. Chrysopsis stenophylla (A. Gray.) Greene. 

 Nebraska according to Britton's Manual. 



3. Chrysopsis horrida Rydb. 



In dry soil in the western part of the state. Pumpkin Seed Valley; 

 Lawrence Fork. 



4. Chrysopsis pumila Greene. 



Nebraska according to Rydberg's Flora of Colorado, 



5. Chrysopsis hispida (Hook.) Nutt. 



In dry soil in the western part of the state. Deuel County;, Long 

 Pine; Riverton. 



4. Chrysothamus. 931. 



Involucral bracts not acuminate, heads 12 mm. high, leaves 2-4 mm. 



wide. 1. C. graveolens. 



Involucral bracts subulate tipped, heads 14-20 mm. long, leaves about 



2 mm. wide. 2. C. howardi. 



1. Chrysothamus graveolens (Nutt.) Greene. 



On "badlands" and dry hills in the western part of the state. Chad- 

 ron; Hat Creek Basin; Scotts Bluff. 



2. Chrysothamus howardi (Parry.) Greene. 

 In canons south of Scotts Bluff. 



5. Sideranthus. 932. 



Leaves spinescently toothed, not pinnatifid. 



Rays wanting, perennial with woody caudex. 1. S. grindelioides. 



Rays present, annual. 2. S. annuus. 



Leaves pinnatifid. 3. S. spinulosus. 



1. Sideranthus grindelioides (Nutt.) Britton. 



Eriocarpum grindelioides Nutt. 

 On dry plains in the western part of the state. Callaway; Banner 

 County; Hat Creek Basin. 



3. Sideranthus annuus Rydb. 



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



3. Sideranthus spinulosus (Pursh.) Sweet. 



Common in dry soil in the western part of the state. Broken Bow; 



Cambridge; Culbertson; Deuel County; Fairbury; Niobrara; Thedford; 



Red Cloud; Valentine; Wild Cat Mountains 



6. Stenotus. 933. 



1. Stenotus acaulis Nutt. 



Nebraska according to Britton's Manual. 



