CARDUACEAE. 347 



Inflorescence narrow, scarcely secund ; bracts linear-lanceolate. 



10. 5". missouriensis. 

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



11. 5". 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. 5. 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. 



16. 5". serra. 

 Leaves densely canescent, especially beneath. 



Leaves usually broadly lanceolate, scabrous above. 17. 5. scabrhiscula. 



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

 or less yellowish-gray. 18. 5'. gilvocanescens. 



VII. Incanae. 



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



19. 6". 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. 5. pulcherrima. 



Stem-leaves spatulate or elliptic. 21. 5'. 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 oieophlla Rydb. (6". humilis A. Gray, in part; 6". 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 



