Gents 22.] 



THISTLE FAMILY. 



347 



47. Solidago Houghtonii T. & G. 



Houghton's Golden-rod. 

 (Fig. 3717-) 



Solidago Houghtonii T. & G. ; A. Gray, Man. 

 2U. 1848. 



Stem slender, glabrous below, sparingly 

 pubescent above, i°-2° bigh. Leaves 

 linear, the basal and lower ones petioled, 

 4'-5' long, 2"-4" wide, 3-uerved, en- 

 tire, acute at each end, the upper 

 smaller, sessile, slightly conduplicate, 

 otherwise similar, the uppermost small 

 and bract-like; heads about 3" high, few, 

 in a small corymbose cyme, 20-30- 

 flowered; involucre broadly campanulate, 

 its bracts oblong, obtuse; achenes gla- 

 brous, 4-5-nerved. 



In swamps, north shores of Lakes Superior 

 and Huron, and in Genesee Co., N. Y. 

 .\utumn. 



1818. 



23. EUTHAMIA Nutt. Gen. 2: 



Erect, paniculatelj'-branched herbs, perennial by long rootstocks, with linear or linear- 

 lanceolate entire sessile i-5-nerved punctate leaves, and very numerous small heads of both 

 tubular and radiate j'cUow flowers, clustered in the large cymose, convex or nearly flat-topped 

 inflorescence. Bracts of the involucre obtuse, imbricated in several series, appressed, some- 

 what glutinous. Receptacle flattish, fimbrillate, or pilose. Ray-flowers pistillate, usually 

 more numerous than the disk-flowers, the rays small. Disk-flowers perfect. Anthers obtuse 

 at the base. Style-branches with lanceolate appendages. Achenes top-shaped or oblong, 

 villous-pubescent. [Greek, referring to the clustered heads.] 



Four known species, the following, and one of western North America. 



Leaves distinctly 3- 5-nerved; ray-flowers 12-20. 



Leaves i-nerved. or with a pair of indistinct lateral nerves; raj'-flowers 5-10. 



Stem-leaves 2"-3" wide: disk-flowers 3 or 4. 



Leaves .'--"-I'z" wide; disk-flowers 5 or 6. 



1. E. graminifolia. 



2. E. leptocephala. 



3. E. Caroliiiiana. 



I. Euthamia graminifolia (L,.) Nutt. Bushy or Fragrant Golden-rod. 



(Fig. 3718.) 



Chiysocoma graminifolia L. Sp. PI. 841. 1753. 

 Solidago lanceolata L. Mant. 114. 1767. 

 Eulliamia graminifolia Nutt. Gen. 2: 162. 



1818. 

 Solidago graminifolia Ell. Bot. S. C. & Ga. 2: 



39'- 1824. 



Stem paniculately much branched, or 

 rarely simple, glabrous but sometimes 

 slightly rough above, 2°-4° high. Leaves 

 numerous, linear-lanceolate, acuminate or 

 acute at each end, i'-5' long, 2"-\" wide, 

 3-5-ncrved, minutely rough-pubescent on 

 the margins and nerves of the lower surface; 

 resinous dots few ; heads 2"-}/' high, sessile 

 in capitate clusters arranged in a flat-topped 

 corymbose cyme; involucre ovoid-campanu- 

 late, its bracts oblong or oblong-lanceolate, 

 slightly viscid; rays 12-20; disk- flowers S-i 2. 



In moist soil, fields and roadsides, New Bruns- 

 wick to the Northwest Territory, south to 

 Florida, Nebraska and Missouri. Fragrant. 

 July-Sept. 



fkiUuc^ 



