CARDUACEAE. 347 



Inflorescence narrow, scarcely secund ; bracts linear-lanceolate. 



10. S. missouriensis. 

 Inflorescence usually open and more or less secund ; bracts oblong-lanceolate. 



11. S. glaberrima. 

 Heads 6-7 mm. high; stem stout. 12. 5". concinna. 



V. SEROTINAE. 



Leaves green, sparingly pubescent or glabrous ; pubescence scabrous, mostly 



confined to the margins and the veins. 



Stem usually glabrous up to the inflorescence; heads 5 mm. high or more; 

 leaves glabrous except on the margins and on the mid-veins. 



13. S. Pitcheri. 

 Stem more or less pubescent. 



Heads 5 mm. or more high ; leaves pubescent ; plant stout. 



14. S. polyphylla. 

 Heads about 4 mm. high ; plant comparatively slender. 



Leaves pubescent at least on the veins. 15. 5". canadensis. 



Leaves glabrous, except the scabrous-ciliolate margins. 



1 6. 5". serra. 

 Leaves densely canescent, especially beneath. 



Leaves usually broadly lanceolate, scabrous above. 17. 5". scabriuscula. 



Leaves linear-lanceolate, finely and rather softly canescent on both sides, more 



or less yellowish-gray. 18. S. gilvocanescens. 



VII. INCANAE. 



Plants low, 1-2 dm. high ; inflorescence corymbiform ; branches not secund. 



19. 5". nana. 

 Plants tall, 2-6 dm. high ; inflorescence narrow, or if open with distinctly secund 



branches. 

 Bracts oblong of linear, obtuse ; stem-leaves scarcely triple-veined ; inflorescence 



usually narrow. 



Stem-leaves oblanceolate. 20. S, pulcherrima. 



Stem-leaves spatulate or elliptic. 21. S. radulina. 



Bracts lanceolate or ovate, acute ; stem-leaves distinctly triple-veined ; in- 

 florescence usually more open. 

 Stem-leaves oblanceolate or elliptic ; bracts lanceolate. 



22. 5". trinervata. 

 Stem-leaves obovate, thick ; bracts ovate. 23. S. mollis. 



1. Solidago scopulorum (A. Gray) A. Nels. (S. multiradiata scopulorum 

 A. Gray) On hills and mountains from Alb. and B. C. to Colo, and Utah. 

 Alt. 8000-10,000 ft. Bard Creek, near Empire; Lake City; Grizzly Creek; 

 White River Plateau ; Robinson ; Mt. Harvard ; Big South ; Gore Pass. 



2. Solidago ciliosa Greene. In the higher mountains from Alb. to Colo, 

 and Ariz. Alt. up to 13,000 ft. Ironton, San Juan Co.; Seven Lakes; Gray's 

 Peak. 



3. Solidago rubra Rydb. In the mountains of Colo. North Park; Grizzly 

 Creek, Larimer Co. 



4. Solidago laevicaulis Rydb. In the mountains of Colo, and Wyo. Alt. 

 up to 11,000 ft. North Park; Berthoud Pass. 



5. Solidago decumbens Greene. (S. humilis nana A. Gray) On the higher 

 mountains of Wyo. and Colo. Alt. 10,000-13,000 ft. Gray's Peak; near Em- 

 pire; Mt. Harvard; Mt. Garfield; near Pagosa Peak; Bottomless Pit; Cam- 

 eron Pass; Berthoud Pass. 



6. Solidago oreophila Rydb. (S. humilis A. Gray, in part; 5". humilis Pat- 

 tersonii Gandoger) In the mountains from Mackenzie to Colo. Alt. 7000- 

 11,000 ft. Clear Creek; near Empire; near Pagosa Peak; Minnehaha; Estes 



