CARDUACEAE. 347 



Inflorescence narrow, scarcely secund ; bracts linear-lanceolate. 



ID. 6". missouriensis. 

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



U.S. glabcrrima. 

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



V. Serotixae. 



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. 5'. polyphylla. 

 Heads about 4 mm. high ; plant comparatively slender. 



Leaves pubescent at least on the veins. 15. S. canadensis. 



Leaves glabrous, except the scabrous-ciliolate margins. 



16. .S". serra. 

 Leaves densely canescent, especially beneath. 



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



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. S. 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. S. 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. — fronton, 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. hmnilis 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. hmnilis A. Gray, in part ; 5". humilis Pat- 

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

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



