1198 . CAKDUACEAE 



45. Solidago celtidif olia Small. Similar to S. rugosa in habit. Stems often more 

 purple and more prominently striate and rather less pubescent : leaves numerous ; blades 

 thick and firm, somewhat pubescent, those of the basal and lower cauline spatulate to oval- 

 or oblong-spatulate, 6-13 cm. long, those of upper cauline oval to ovate or rarely oblong, 

 2-6 cm. long, or shorter on the branches, crenate or appressed serrate-crenate, obtuse or 

 acutish, rugose-veiny at least in age : heads numerous, secund on the more or less spread- 

 ing branches of the panicle : involucres cylindric, or campanulate at maturity, 3-3.5 mm. 

 high, about 2 mm. thick ; bracts narrowly linear, obtuse or acutish, keeled on the back : 

 achenes pubescent. 



In sandy soil or dry woods, Alabama and Florida to Arkansas and Texas. Summer and fall. 



46. Solidago ulmifolia Muhl. Stems 5-12 dm. tall, striate or striate-angled, glabrous 

 below the branches of the inflorescence : leaves relatively few ; blades thinnish, more or 

 less pubescent, those of the basal and lower cauline spatulate, mainly 1-2 dm. long, nar- 

 rowed into petiole-like bases, those of the upper cauline elliptic to oblong or elliptic- or 

 oblong-lanceolate, acute or somewhat acuminate, more or less sharply serrate, conspicuously 

 veined beneath : heads few or numerous, secund on the spreading or recurved branches of 

 the inflorescence : involucres cylindric, not spirally twisted, 3-3.5 mm. high, 2 mm. thick ; 

 bracts mainly linear, obtuse or obtusish, slightly keeled along the back : achenes pubescent. 



In dry soil and woods, Maine to Minnesota, Georgia, Kansas and Texas, Summer and fall. 



47. Solidago microphylla Engelm. Stems 8-13 *dm. tall, striate-ridged, more or 

 less branched, glabrous : leaves rather numerous, deep green ; blades somewhat pubescent, 

 often becoming thick and firm, those of the basal and lower cauline leaves spatulate to ob- 

 lanceolate-spatulate, 6-11 cm. long, rather shallowly serrate, narrowed into petiole-like 

 bases, those of the upper cauline elliptic to oblong or oblong-ovate, acute or slightly acumi- 

 nate, shallowly toothed or entire : heads numerous, often very numerous, secund on the 

 more or less elongated curved slightly pubescent branches of the inflorescence : involucres 

 cylindric-turbinate, 4-4.5 mm. high, about 2 mm. thick, not spirally twisted ; bracts 

 linear-lanceolate to narrowly linear, acute : achenes pubescent. 



In dry soil, Kansas to Arkansas and Texas. Summer and fall. 



48. Solidago H611eri Small. Stems 7-16 dm. tall, striate-angled, purplish, glabrous : 

 leaves rather numerous, deep green ; blades slightly pubescent beneath, especially about 

 the veins ; those of the cauline leaves elliptic to oblong, 3-10 cm. long, acute, serrate with 

 often appressed teeth, rigidly ciliate : branches of the inflorescence bearing numerous 

 narrow leaves mainly 1-1.5 cm. long : heads numerous, secund on the elongated curved 

 pubescent branches : involucres cylindric, spirally twisted, 6-7 mm. high, 2.5 mm. thick ; 

 bracts linear to linear-lanceolate, acute or acutish, keeled on the back : achenes pubescent. 



In sandy woods, Arkansas and adjacent Texas. Summer and fall. 



49. Solidago Ellidttii T. & G. Stems 8-18 dm. tall, striate or striate-angled, simple 

 or branched above : leaves numerous, often approximate ; blades thickish, glabrous or 

 merely puberulent on the veins beneath, those of the basal and lower cauline leaves spatu- 

 late, mostly 1-2 dm. long, shallowly serrate, those of the upper cauline elliptic to elliptic- 

 lanceolate, shallowly toothed or merely undulate, all minutely veiny beneath : heads 

 numerous, secund and crowded on the approximate pubescent branches of the inflorescence : 

 involucres campanulate, 4-5 mm. high, about 2 mm. thick ; bracts mainly linear, obtuse, 

 somewhat keeled along the back : achenes finely pubescent. 



In swamps, mainly near the coast, New Hampshire and Massachusetts to Georgia. Summer and 

 fall. 



50. Solidago Boottii Hook. Stems 6-15 dm. tall, purple, striate-ridged, glabrous 

 below the inflorescence, usually widely branched above : leaves relatively few ; blades 

 thickish, glabrous, those of the basal and lower cauline spatulate to oblong- or elliptic- 

 spatulate, shallowly but sharply and sometimes finely serrate, narrowed into petiole-like 

 bases, those of the upper cauline leaves gradually smaller, narrowly elliptic to elliptic- 

 lanceolate, acute or acuminate, shallowly toothed or undulate : heads rather numerous, 

 secund but not crowded on the usually greatly elongated and widely spreading pubescent 

 branches of the inflorescence : involucres broadly campanulate, 3.5-4 mm. high, about 3 

 mm. thick ; bracts linear to oblong-linear, decidedly obtuse, angled on the back : achenes 

 pubescent. 



In woods, Maryland to Florida and Texas. Summer and fall. 



51. Solidago strigosa Small. Stems 6-13 dm. tall, finely pubescent, or essentially 

 glabrous below the inflorescence, purple-tinged, striate-ridged : leaves few ; blades strigose, 

 those of the basal and lower cauline ovate, oval or elliptic, 4-12 cm. long, rather coarsely 

 serrate-crenate, or more serrate west of the Mississippi River, narrowed into slender petiole- 

 like bases, those of the upper cauline much smaller, relatively narrower, ovate to elliptic 



