506 COM POSIT AE (COMPOSITE FAMILY) 



sessile, acuminate at apex, narrowed at base, 5-10 cm. long, very rough- 

 margined, entire, or sparingly serrate with low, sharp teeth; the basal and 

 lowest ones larger, spatulate, petioled: heads 5-6 mm. high; bracts of the in- 

 volucre oblong, greenish-tipped, obtuse, or the inner acute, thick: rays 6-13, 

 short. (S. glaberrima Rydb. in Fl. Col. 348. 1896.) Coming into our range 

 from the prairie States to the eastward. 



6. Soli dago concinna A. Nels. Bull. Torr. Bot. Club 25: 377. 1898. Stems 

 tufted, often numerous, glabrous, 1.5-4 dm. high: root leaves narrowly ob- 

 lanceolate, 8-15 cm. long; stem leaves narrowly oblong or oblanceolate, those 

 of the inflorescence small and linear; all the leaves obscurely scabro-ciliate on 

 the margins, usually a few of them showing slight serrations, triple-nerved, 

 but the lateral ones often incomplete or obscure: heads about 5 mm. high, 

 very numerous, closely f astigiate-glomerate ; bracts of the involucre oblong, 

 subacute or obtuse, thin-margined, greenish down the middle: rays small, 5-9; 

 disk-flowers 10-15. S. missouriensis extraria. Frequent in the foothills and 

 mountains; New Mexico to the Canadian Rocky Mountains. 



7. Solidago serotina Ait. Hort. Kew 3: 211. 1789. Stem stout, 6-18 dm. 

 high, very smooth and glabrous up to or near the ample panicle, sometimes 

 glaucous: leaves commonly ample, lanceolate or broader, 8-15 cm. long, 

 sharply and saliently serrate, in the typical plant glabrous both sides: heads 

 crowded, rather large, 6-7 mm. long; bracts of the involucre broadly linear 

 or linear-oblong: rays 7-14, moderately large and conspicuous. [S. Pitcheri 

 (Nutt.) Rydb. in Fl. Col. 1. c.] Colorado to Montana and thence across the 

 continent. 



8. Solidago elongata Nutt. Trans. Am. Phil. Soc. 7: 327. 1841. Stems 

 rather slender, 3-8 dm. high, smooth or minutely pubescent, strict: leaves 

 lanceolate, acute or acuminate at both ends, sparingly serrate, nearly glabrous, 

 obscurely 3-nerved: panicle elongated, virgate or narrowly pyramidal, 1-2 dm. 

 long, the racemes at length somewhat spreading: bracts of the involucre 

 linear-subulate: rays small and slender: achenes pubescent. (S. polijphylla 

 and S. serra Rydb. Bull. Torr. Bot. Club 31: 650. 1904.) Mostly in dry 

 ground; throughout our range and far northwestward. 



9. Solidago canadensis L. Sp. PL 878. 1753. Stems 4-12 dm. high, from 

 scabrous- or cinereous-puberulent to hirsute: leaves mostly lanceolate, pu- 

 berulent, pubescent, or nearly glabrous, sharply serrate or the upper entire, 

 veiny, and with lateral ribs prolonged parallel to the midrib: heads small, 

 ordinarily only 4-5 mm. long; bracts of the involucre small and pale, narrowly 

 linear, acutish or obtuse: rays 9-16, more numerous than the disk-flowers. 

 Common and very variable; from New Mexico to Montana and to the Atlantic 

 States. 



9a. Solidago canadensis procera (Ait.) T. & G. Fl. 2: 224. 1841. Leaves 

 less serrate, sometimes all entire, cinereous-pubescent with short-appressed 

 hairs. Range of the species. 



96. Solidago canadensis scabriuscula Porter, Mem. Torr. Club 5: 318. 



1894. Leaves shorter, sparingly serrate or entire, rough above, rugose be- 

 neath: heads usually larger. [S. scabriuscula (Porter) Rydb. 1. c. 33: 153. 

 1906.] Range about the same as the species. 



9c. Solidago canadensis gilvocanescens Rydb. Contrib. Nat. Herb. 3: 162. 



1895. Only 2-4 dm. high, leafy, canescent, pale or yellowish: leaves remotely 

 serrate or entire: inflorescence crowded. (S. gilvocanescens Rydb. Bull. Torr. 

 Bot. Club 33: 153. 1906.) On the dry plains; Colorado and Wyoming to 

 Nebraska. 



10. Solidago pulcherrima A. Nels. 1. c. 42. Closely cinereous-puberulent 

 throughout; stems tufted, diffusely spreading, 6-8 dm. long: lower stem leaves 

 very narrowly oblanceolate, obscurely 3-nerved, entire, 6-12 cm. long; upper 

 leaves oblong; those of the long, virgate, secund inflorescence regularly re- 

 duced but leaf-like except at the summit where they become mere bracts: 

 panicle narrow, racemose, 2-4 dm. long, the short crowded branches scorpioid: 

 bfeads about 6 mm. high; bracts of the involucre oblong-elliptic, obtuse, gla- 

 brous, greenish with thin colorless margins: rays usually 5, small, spatulate; 



