CARDUACEAE. 379 



Branches of the caudex not copiously villous. 



Bases of the leaves not broader than the oblanceolate or almost linear 



blades ; branches of the caudex short and stout. 



Leaves oblanceolate ; bracts slightly shorter than the disk ; rays not 

 strongly veined. 10. T. glabriuscula. 



Leaves linear or oblanceolate-linear ; bracts one-fourth shorter than 

 the disk; rays strongly nerved. n. T. angustifolia. 



Bases of the leaves 2-4 times as wide as the linear leaf-blades ; branches 

 of the caudex elongated ; bases of the leaves and involucres sparingly 

 silky villous. 12. T. stenophylla. 



Stems 2-3 dm. high with 2-4 leaves. 



Outer bracts oval or ovate, purple. 13. T. leptoclada. 



Outer bracts linear-oblong or lanceolate, green. 14. T. intermedia. 



1. Tetraneuris acaulis (Pursh) Greene. (Actinella acaulis Nutt.) On 

 hills and dry plains from Neb., Mont, and Ida. to N. M. Alt. 4000-6000 ft. 

 Rocky Ford, Otero Co.; Bartlett; mesas near Pueblo; Trinidad; Colorado 

 City. 



2. Tetraneuris simplex A. Nelson. On dry hills from S. D. and Ida. to 

 Neb. and Colo. Crow Creek; Monument. 



3. Tetraneuris trinervata Greene. On dry hills from Colo, to Tex. On 

 the Platte. 



4. Tetraneuris lanata (Nutt.) Greene. (Actinella lanata Nutt.) On the 

 mountains of Wyo. and Colo. Alt. 6000-13,000 ft. Mountain near Veta 

 Pass; Seven Lakes; Como; West Indian Creek; west slope of Bald Moun- 

 tain; Pike's Peak; Central City; Mt. Garfield; mesas near Colorado Springs; 

 Berthoud Pass; Sangre de Cristo Pass; north of La Porte; Pine Grove; 

 James' Peak. 



5. Tetraneuris Torreyana (Nutt.) Greene. (A. Torreyana Nutt.) On 

 rocky hills of Wyo., Colo, and Utah. Alt. 4000-6500 ft. Near northern 

 State line. 



6. Tetraneuris brevifolia Greene. Exposed mountains near Pike's Peak, 

 Colo. 



7. Tetraneuris arizonica Greene. On dry hills from Colo, to Ariz. Trini- 

 dad ; Colorado Springs. 



8. Tetraneuris pilosa Greene. On dry hills and mountains from Colo, to 

 Ariz. Alt. about 7000 ft. Los Pinos (Bayfield) ; Manitou. 



9. Tetraneuris Crandallii Rydb. On dry hills of Colo. Alt. 4000-5000 ft. 

 Grand Junction ; McCoy's, Eagle Co. ; Cimarron. 



10. Tetraneuris glabriuscula Rydb. (T. glabra Greene; not Actinella glabra 

 Nutt.) On dry hills from Colo, and Nev. to N. M. Alt. about 6000 ft. 

 Ft. Collins ; Canon City ; Red Rock Canon, near Pike's Peak. 



11. Tetraneuris angustifolia Rydb. On dry rocky hills from Colo, to Tex. 

 and N. M. Alt. up to 7000 ft. Table Rock; Mancos; Ft. Lyon; Arkansas 

 River. 



12. Tetraneuris stenophylla Rydb. On dry plains from Kans. and Colo, to 

 Tex. ; also Mex. Banks of Cimarron. 



13. Tetraneuris leptoclada (A. Gray) Greene. (Actinella leptoclada A. 

 Gray; T. Mancosensis A. Nels.) On dry hills of Colo, and N. M. Alt. up 

 to 9000 ft. Mancos; Leroux Creek, Delta Co. 



14. Tetraneuris intermedia Greene. On dry hills of southern Colo. Alt. 

 6500-7000 ft. Cimarron; Pagosa Springs. 



