FLORA OF THE DISTRICT OF COLUMBIA. 277 



Heads 4-4.5 mm. high, the branches of the panicle long, slender, 



recurved ; petioles not sheathing 13. S. juncea. 



Stems pubescent throughout (rarely glabrous at the base) with fine and close or 

 long and spreading hairs. 

 Leaves 3-nerved (that is, 2 of the lateral nerves very conspicuous), lanceolate 

 or narrowly lanceolate. Heads in slender one-sided racemes. 

 Heads 3-3.5 mm. high; leaves usually smooth on the upper surface; branches 



of the panicle slender 16. S. canadensis. 



Heads 4-4.5 mm. high; leaves very rough on the upper surface; branches of 



the panicle rather stiff and stout 17. S. altissima. 



Leaves pinnately nerved, none of the lateral nerves much more conspicuous 

 than the others. 

 Rays white. Heads 5-6 mm. long, the branches of the panicle not one-sided, 



3. S. bicolor. 

 Rays yellow. 



Heads 7-10 mm. high; bracts pubescent on the back, conspicuously 

 nerved; leaves very rough, stiff, densely pubescent, the upper ones 



obtuse 19. S. rlgida. 



Heads 6 mm. high or less; bracts glabrous on the back, not nerved; leaves- 

 thin, the upper ones acute. 

 Leaves pubescent with very minute, close hairs. 

 Bracts oblong or narrowly oblong, obtuse; heads in one-sided racemes," 



achenes glabrous 6. S. puberula. 



Bracts linear or narrowly linear, acutish; racemes not one-sided; 



achenes pubescent : 18. S. nemoralis. 



Leaves with long slender spreading hairs on the lower surface . 

 Heads not in one-sided racemes; leaves not rugose, the lower stem 

 leaves narrowed into winged petioles; plants without stolons. 



4. S. hispida. 

 Heads in one-sided racemes; leaves more or less rugose, the stem leaves 



sessile; plants with stolons 9. S. rugosa. 



1. Solidago flexicaulis L. 



Shaded bluffs along the upper Potomac. Sept.-Oct. Eastern N. Amer. {S. 

 latifolia L.) 



2. Solidago caesia L. 



Moist or dry woods; common. Sept.-Oct. Eastern N. Amer. 



3. Solidago bicolor L. Silver-rod. 

 Dry or moist woods; common. Sept.-Oct. Eastern N. Amer. 



Readily distinguished from our other species by the white rays. 



4. Solidago hispida Muhl. 



Dry ground; llock Creek Park; Pinehurst; rare. Sept.-Oct. Eastern N. Amer. 

 (iS. bicolor concolor Torr. & Gray.) 



5. Solidago erecta Pursh. 



Wooded ground; common. Sept.-Oct. Eastern U. S., north to N. Y. {S.speciosa 

 angustata Torr. & Gray.) 

 Kays turning white in age. 



6. Solidago puberula Nutt. 



Open woods; Lanham and Laurel. Sept.-Oct. Eastern N. Amer. 



7. Solidago racemosa Greene. 



On rocks along the upper Potomac. Aug.-Oct. Newf. to Va. (S. virga-aurea- 

 humiJis A. Gray.) 



Usually low and stout, but sometimes a meter high. 



