GENUS 22. 



THISTLE FAMILY. 



397 



46. Solidago rigida L. Stiff or Hard- 

 leaved Golden-rod. Fig. 4258. 



Solidago rigida L. Sp. PI. 880. 1753. 

 Oligoneuron canescens Rydb. Bull. Torr. Club 31 : 

 652. 1905. 



Stem stout, simple, or branched above, 

 densely and finely rough-pubescent, hoary, i- 

 5 high. Leaves thick, flat, rigid, ovate to 

 oblong, pinnately veined, often obtuse, rough 

 on both sides, or smoothish beneath, the upper 

 sessile, clasping, and rounded or sometimes 

 narrowed at the base, i '-2' long, mostly entire; 

 lower and basal leaves long-petioled, some- 

 times i long and 3' wide, entire or serrulate; 

 heads 4"-5" high, many-flowered, in a terminal 

 dense, compound corymb, the clusters some- 

 times slightly secund ; involucre broadly cam- 

 panulate, its bracts oblong, obtuse, the outer 

 pubescent; rays 6-10, large; achenes glabrous, 

 io-i5-nerved. 



In dry sandy, gravelly or rocky soil, Ontario to 

 Saskatchewan, Massachusetts, Georgia, Texas and 

 Colorado. Aug.-Oct. 



Solidago corymbosa Ell., of the Southern States, 

 differing by being less rough and with slightly 

 smaller heads, probably a race of this species, 

 ranges north into Ohio. 



48. Solidago Riddellii Frank. Riddell's 

 Golden-rod. Fig. 4260. 



Solidago Riddellii Frank ; Riddell, Syn. Fl. West. 

 States 57. 1835. 



Stem stout, glabrous, or slightly pubescent 

 above, i-3 high. Leaves numerous, thick, 

 glabrous on both sides, entire, acute at each 

 end, the lower and basal ones long-petioled, 

 elongated, lanceolate, somewhat triple-nerved 

 and conduplicate, often i long, 4"-io" wide, 

 the upper smaller, similar, sessile and clasping 

 at the base, conduplicate, somewhat falcate ; 

 heads 3"-4" high, 2O-3o-flowered, very numer- 

 ous in a dense corymb; involucre oblong-cam- 

 panulate, its bracts broadly oblong, obtuse; 

 rays 7-9, narrow ; achenes S-nerved, glabrous. 



On moist prairies, Ontario to Minnesota, Ohio 

 and Missouri. Also at Fortress Monroe, Va. A 

 supposed hybrid with S. rigida L. occurs in Iowa. 

 Aug.- Sept. 



47. Solidago ohioensis Riddell. Ohio 

 Golden-rod. Fig. 4259. 



Solidago ohioensis Riddell, Syn. Fl. West. 

 States 57. 1835. 



Very smooth throughout; stem rather 

 slender, simple, 2-3 high. Leaves firm, 

 pinnately veined, flat, the basal and lower 

 ones elongated-lanceolate or oblong-lanceo- 

 late, obtuse, long-petioled, serrulate toward 

 the end, or entire, often i long; upper 

 leaves sessile, lanceolate, entire, gradually 

 smaller and those of the inflorescence bract- 

 like; heads 2i"-3" high, numerous in a 

 terminal compound corymb, 15-25-flowered ; 

 rays 6-9, small ; bracts of the narrowly cam- 

 panulate involucre oblong, very obtuse, gla- 

 brous ; achenes glabrous, 5-nerved. 



In moist soil, western New York and south- 

 ern Ontario to Illinois, Michigan and Wiscon- 

 sin. Aug.-Sept. 



