398 COMPOSITAE, Vou. II. 
i) 49. Solidago Hotghtonii T. & G. 
Houghton’s Golden-rod. Fig. 4201. 
if Solidago Houghtonit T. & G.; A. Gray, Man. 
ati, 1848, 
Stem slender, glabrous below, sparingly 
pubescent above, 1°-2° high. — Leaves linear, 
the basal and lower ones petioled, 4’-s’ 
tong 2-4” wide, 3-nerved, entire, acute at 
each end, the upper smaller, sessile, slightly 
conduplicate, otherwise similar, the upper- 
most small and bract-like; heads about 3” 
high, few, in a small corymbose cyme, 20- 
30-flowered; involucre broadly campanu- 
late, its bracts oblong, obtuse; achenes gla- 
brous, 4-5-nerved. 
t 
Pf In swamps, north shores of Lakes Michigan 
i] and Huron, and in Genesee Co., N. Y. Re- 
My / corded from Lake Superior. Autumn, 
uw 
23. EUTHAMIA Nutt. Gen. 2: 162. 1818. 
Erect, paniculately-branched herbs, perennial by long rootstocks, with linear or linear- 
lanceolate, entire, sessile, 1-5-nerved punctate leaves, and very numerous small heads of both 
tubular and radiate yellow flowers, clustered in the large corymbose, convex or nearly flat- 
topped inflorescence. Bracts of the involucre obtuse, imbricated in several series, appressed, 
somewhat 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.] 
About 10 species, natives of North America. Type species: Euthamia graminifolia (L.) Nutt. 
Leaves distinctly 3~5-ribbed ; heads 20~-30-flowered. ere 
Involucre 2”-2%4” high, the bracts yellowish. . 1. E. graminifolia. 
Involucre less than 2” high, the bracts with appressed green tips. 2. E. floribunda. 
Leaves 1-ribbed, or with a pair of indistinct Jateral nerves; heads rarely more than 20-flowered. 
Involucre 24%4”-3” high ; southwestern specics. | 
Leaves 2”-4” wide ; involucre scarcely viscid. 3 
Leaves 1”-2%4” wide; involucre very viscid. 4 
Involucre 2” high, or less. | eae 
Leaves 1”-2%4” wide; involucre campanulate. | 5. E. tenuifolia, 
Leaves less than 1” wide; involucre subcylindric. 6. E. minor. 
. E.leptocephala. 
. E. gymnospermoides, 
1, Euthamia graminifolia (L.) Nutt. _yatiy an 
Bushy, Fragrant, or Flat-topped Golden- &&\ 
rod. Fig. 4262. ; q 
Chrysocoma graminifolia L. Sp. Pl. 841. 1753. 
Solidago lanceolata L. Mant. 114. 1767. 
S. graminifolia Salisb. Prodr. 109. 1796. 
E. graninifolia Nutt. Gen. 2: 162, 1818, 
£, Nuttallit Greene, Pittonia 5: 73. 1902, 
E. camporum Greene, loc. cit. 74. 1902. 
Stem paniculately much branched, or rarely 
simple, glabrous or roughish-pubescent, 2°-4° 
high, Leaves numerous, linear-lanceolate, 
acuminate or acute at each end, 1-5’ long, 
2”-4” wide, 3-5-nerved, minutely rough-pubes- 
cent on the margins and nerves of the lower 
surface; resinous dots few; heads 2-24” high, 
sessile in capitate clusters arranged in a flat- 
topped compound corymb; involucre ovoid- Wa 
campanulate to subcylindric, its yellowish OM 4 
bracts oblong or oblong-lanceolate, slightly NIN 
viscid; rays 12-20; disk-flowers 8-12. 
In moist soil, fields and roadsides, New Bruns- 
wick to Saskatchewan, Alberta, Florida, Nebraska 
and Wyoming. Fragrant. July-Sept. 
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