GKNIS 22.] 



THISTLE FAMILY 



17. Solidago Purshii Porter. River-bank 

 Golden-rod. (Fig. 3687.) 



So/idasro humilis Pursh, Kl. Am. Sept. 543. 1S14. 



Not "Mill. 

 Solidago /'7<ri/(«7Porter, Bull. Torr. Club, 21:311. 1894. 

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



Glabrous or nearly so; stems simple, usually 

 somewhat glutinous, 6'-iS' high. Lower and basal 

 leaves oblauceolate, obtuse or acutish, dentate, or 

 crenate, 2'-6' long, yi'-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, obtu?e, or the inner 

 acutish; achencs striate, pubescent. 



On rocky river-banks, Newfoundland to northern 

 New York, Vermont and Virginia. July-Scpt. 



18. Solidago alpestris Wald. & Kit. 

 Alpine Golden-rod. (Fig. 3688.) 



Solidago alpeslris Wald. & Kit. PI. Rar. Hung. 3. 



pi. 20S. 1812. 

 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 oblauceolate, 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. PI. 880. 1753. 



Somewhat pubescent, at least above; stem usually 

 simple, rather stout, i°-2° high. Basal leaves oblau- 

 ceolate, broadly spatulate, or obovate, 3^-5' long, i' 

 ■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 :>,"-\" high, in a narrow, dense or inter- 

 rupted, rarely branched thyrsus which is often 10' 

 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. 

 SoUdago Virgaurea Randii Porter, Bull. Torr. Club, 20: 208. 



1893- 

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

 lieads in a large paniculately branched thyrsus. Maine, 

 Kew Hampshire and Vermont. 



SoHdago Virgaurea D^anei Porter, Mem. Torr. Club, S: 320. 1894. 

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

 &G. 1S41. 



Stem only 3'-i2' high, often slender; thyrsus short, 2' -4' long; heads i J -"-3" high. Mountains, 

 Maine, Vermont and New Hampshire. 



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

 glutinous; stem i -i '2° high; leaves thick; thyrsus paniculately branched, large^the strict 



Very _ 

 branches erect-ascending. 



Mt. 



Desert Island, Maine, and Indian Pass, Adirondacks, N. 

 22 



Y. 



