Genus 22.] 



THISTLEIFAMILY. 



337 



17. Solidago Purshii Porter. River-bank 

 Golden-rod. (Fig. 3687.) 



Solidago humilis Pursh, PI. Am. Sept. 543. 1814. 



Not Mill. 

 Solidago Purshii Porter, Bull. Torr. Club, 21:311. 1894. 

 .S". racemosa Greene, Pittonia, 3: 160. 1897. 



Glabrous or nearly so; stems simple, usually 

 somewhat glutinous, 6 / -i8 / high. Lower and basal 

 leaves oblanceolate, obtuse or acutish, dentate, or 

 crenate, 2 / -6 / long, / '^ / -i / wide, narrowed into 

 slightly margined petioles; stem leaves sessile, lan- 

 ceolate, oblong or linear, numerous, crenate or 

 entire, mostly acute, smaller; heads 3 // ~4 // high in 

 a terminal simple or branched thyrsus; bracts of 

 the involucre linear-oblong, obtuse, or the inner 

 acutish; achenes striate, pubescent. 



On rocky river-banks, Newfoundland to northern 

 New York, Vermont and Virginia. July-Sept. 



18. Solidago alpestris Wald. & Kit. 

 Alpine Golden-rod. (Fig. 3688.) 



Solidago alpestris Wald. & Kit. PL Rar. Hung-. 3. 



pi. 208. 181 2. 

 Solidago Virgaurea var. alpina Bigel. Fl. Bost. Ed. 2, 



307. 1824. 



Glabrous, or somewhat pubescent; stems simple, 

 often tufted, 3 / -i2 / high, ascending, or erect, an- 

 gular. Basal leaves obovate, or broadly spatulate, 

 serrate with low sharp or blunt teeth, at least above 

 the middle, obtuse, or acute, 2 / -4 / long, narrowed 

 into petioles; stem leaves oblanceolate, spatulate, 

 or oblong, sessile, or the lower petioled, mostly 

 distant; inflorescence a short raceme or thyrsus, 

 with clusters of heads in the axils of the leaves; 

 heads 3 // ~4 // high; bracts of the involucre obtuse 

 or acute; achenes pubescent. 



Alpine summits of the mountains of Maine, New 

 Hampshire and northern New York, mostly above tim- 

 ber line. Also in Europe. Aug. -Sept. 



19. Solidago Virgaurea L. European 

 Golden-rod. (Fig. 3689.) 

 Solidago Virgaurea L> Sp. PL 880. 1753. 



Somewhat pubescent, at least above; stem usually 

 simple, rather stout, i-2 high. Basal leaves oblan- 

 ceolate, broadly spatulate, or obovate, 2> / S / long, 1/ 

 wide, or less, obtuse or acute, mostly dentate, nar- 

 rowed into margined petioles; stem leaves sessile, or 

 the lower petioled, oblong-lanceolate to spatulate, 

 acute; heads 3 // -4 // high, in a narrow, dense or inter- 

 rupted, rarely branched thyrsus which is often io / 

 long; bracts of the involucre obtuse or acute; achenes 

 more or less pubescent. 



Maine, New Hampshire, Vermont and northern New 

 "York, mostly at middle altitudes. Also in Europe. Called 

 also Aaron's-rod, Woundwort. Aug. -Sept. 

 Solidago Virgaurea Randii Porter, Bull. Torr. Club, 20: 208- 



More or less glutinous; stem stout, often dark purple; 

 heads in a large paniculately branched thyrsus. Maine, 

 New Hampshire and Vermont. 



Solidago Virgaurea Deanei Porter, Mem. Torr. Club, 5: 320. 1894. 

 Solidago Virgaurea var. monticola Porter, Bull. Torr. Club, 20: 209. 1893. Not 5. monticola T. 

 & G. 1841. 



Stemonly3'-i2' high, often slender; thyrsus short, 2' -4' long; heads i\i"-^" high. Mountains, 

 Maine, Vermont and New Hampshire. 



, Solidago Virgaurea Redfieldii Porter, Bull. Torr. Club, 20: 209. 1893. 



Very glutinous; stem 1 -\% high; leaves thick; thyrsus paniculately branched, large, the strict 

 branches erect-ascending. Mt. Desert Island, Maine, and Indian Pass, Adirondacks, N. Y. 



22 



