COMPOSITAE (COMPOSITE FAMILY) 505 



Stem leaves lanceolate; plants usually more than 4 dm. high 



(4-10 dm.). 

 Nearly or quite glabrous; the leaves ample, usually 



broadly lanceolate and shajply serrate . . . 7. S. serotina. 

 Glabrate or puberulent; the leaves numerous, usually nar- 

 rowly lanceolate, subentire or serrate above the mid- 

 dle g. S. elongata. 



Pubescent at least above, usually on both stem and leaves. 

 Stem and leaves more or less hirsute, often scabrous and then 



somewhat canescent 9. S. canadensis. 



Stem and leaves densely canescent. 



Plants rather tall (3-6 dm.); inflorescence usually foliar- 



bracted. 



Panicle usually long and narrow; involucral bracts obtuse 10. S. pulcherrima. 

 Panicle usually short and broad; involucral bracts acute. 



Floral bracts ovate to lanceolate . . . .U.S. mollis. 



Floral bracts lanceolate to linear . . . 12. S. trinervata. 



Plants mostly low (1-3 dm.), finely cinereous . . .13. S. nana. 

 Rays more numerous than the disk-flowers; receptacle fimbriolate; 

 inflorescence corymbose. 



Leaves linear, dark green 14. S. occidentalis. 



Leaves narrowly oblong-lanceolate, pale green . 15. S. camporum. 



alucral bracts longitudinally striate; the heads in a congested 

 corymb 16. S. rigida. 



1. Solidago pallida (Porter) Rydb. Bull. Torr. Bot. Club 33: 153. 1906. 

 Stout, erect, 3-8 dm. high: leaves ovate to lanceolate, thick and coria- 

 ceous, with prominent veins, pale or whitish: thyrsus narrow, of numerous 

 narrow spike-like clusters, rather showy: heads 5-8 mm. high; the bracts 

 firm, narrowly oblong, very obtuse. (S. speciosa pallida Porter, Bull. Torr. 

 Bot. Club 19: 130. 1892.) Infrequent; Colorado. 



2. Solidago corymbosa Nutt. Trans. Am. Phil. Soc. 7: 328. 1840. Nearly 

 or quite glabrous, 1-3 dm. high: leaves firm and finely veined, entire or spar- 

 ingly serrate; stem leaves ciliate at base, oblong-lanceolate; the radical obovate 

 and narrowed into a petiole: heads rather large, 7-9 dm. high, generally few, 

 in 1 or more rounded or corymbiform clusters; bracts of the involucre about 

 as long as the flowers, acute: rays numerous and conspicuous. S. multiradiata 

 scopulorum. [S. scopulorum (Gray) A. Nels. Bot. Gaz. 37: 264. 1904; S. 

 ciliosa Greene, Pitt. 3: 22. 1896; S. rubra and S. laevicaulis Rydb. 1. c. 33: 

 649. 1904.] In the mountains of our range. 



3. Solidago decumbens Greene, Pitt. 3: 161. 1897. Stems clustered about 

 the summit of a strong perpendicular root, stout, decumbent, 1-4 dm. high, 

 usually dark red, sparsely puberulent, as is also the foliage: lowest leaves 

 spatulate-obovate to oblanceolate, obtuse or acutish, more or less distinctly 

 serrate toward the summit; upper cauline leaves similar, but few and reduced, 

 all scabrous on the margin: inflorescence interruptedly thyrsoid: heads large; 

 bracts of involucre linear, obtusish, of firm texture and carinate-nerved, form- 

 ing about 3 series, the outer and shorter subulate-linear rather than linear: 

 achencs subcylindric, strigose-hispidulous; pappus very strongly barbellate- 

 scabrous. S. humilis nana. (S. oreophila Rydb. Mem. N. Y. Bot. Gard. 1: 

 387. 1900, is merely the larger form from the lower stations.) Frequent in 

 alpine and subalpine stations throughout our range. 



4. Solidago dilatata A. Nels. Bot. Gaz. 30: 196. 1900. Stems simple, or 

 branched above, rather stout, glabrous, 4-6 dm. high: leaves glabrous, con- 

 spicuously reticulate- veiny below, minutely scabro-ciliate on the margins; 

 basal leaves oblong-spatulate to elliptic, tapering into a broad margined 

 petiole which is sometimes as long as the blade, either closely or remotely 

 serrate, mostly obtuse at apex, 10-15 cm. long; the stem leaves numerous, 

 sessile, mostly small (2-3 cm.): inflorescence nearly glabrous, the lower pe- 

 dunculate branches leafy-bracteate : heads about 6 mm. high; involucral 

 bracts in about 3 rows, the 2 inner rows subequal, minutely ciliate on the 

 margins, linear, most of them obtusish and slightly dilated upwards: rays 

 8-10, conspicuous: achenes short and lightly pubescent. Authentic speci- 

 mens from type locality only, Yellowstone Park. 



5. Solidago missouriensis Nutt. Journ. Acad. Phila. 7: 32. 1834. Stem 

 rather slender, 2-4 dm. or more high: leaves firm or thick; those of the stem 



