compositae. 935 



. 2. Leaves triple-nerved, i.e., with a pair of lateral veins stronger than the others, these 



often obscure in No. 41. 

 Stem glabrous ; bracts of the involucre obtuse. 

 Leaves and bracts of the involucre thin. 



Leaves linear-lanceolate, entire or sparingly serrate. 



35. S. rupestris. 

 Leaves lanceolate, sharply serrate. 36. S. serotina. 



Leaves and bracts of the involucre thick, somewhat rigid. 

 Leaves Linear-lanceolate or lanceolate; achenes glabrous. 



37. 6". Missouriensis. 

 Leaves oblong-lanceolate ; achenes silky-pubescent. 



38. S. Shortii. 

 Basal leaves oblanceolate; upper bract-like. 39. S. Gattingeri. 



Stem pubescent or scabrous. 



Leaves lanceolate, sharply serrate or entire, rough above. 



40. S. Canadensis. 

 Leaves oblanceolate, spatulate, oblong or ovate; the lower crenate. 



Minutely rough-pubescent, grayish; lower leaves oblanceolate; heads 4 mm t 



high. 41. *S". nemoralis. 



Canescent and pale ; leaves oblong, or ovate; heads 6 mm. high. 



42. S. mollis. 

 Very scabrous, green, not grayish, nor canescent. 43. S. radula. 

 Leaves broadly ovate-oval, sharply serrate, finely pubescent. 



44. S. Drummondii. 

 * * Heads in a terminal, corymbiform. sometimes thyrsoid cyme, forming a flat* 

 topped inflorescence. 

 Leaves ovate, oblong or oval, very rough on both sides. 45. S. rigida. 



Leaves lanceolate, linear, oblong, or oblanceolate, glabrous or nearly so. 



Leaves, at least the lower, oblanceolate; high northern. 46. S. multiradiata. 



Leaves not oblanceolate nor spatulate. 



Lower leaves oblong-lanceolate, serrulate. 47. S. Ohioensis. 



Leaves all lanceolate or linear, entire. 



Stout ; leaves lanceolate, the basal 2-3 dm. long. 48. S. Riddellii. 

 Slender; leaves linear, the basal 10-12 cm. long. 49. S. Houghtoni. 



1. Solidago squarrdsa Muhl. Stout Ragged Goldexrod. (I. F. f. 3671.) 

 Stem stout, simple, or rarely branched above, glabrous or puberulent, 6-15 dm. 

 high. Upper leaves oblong, acute, entire or nearly so, sessile; lower and basal 

 leaves obovate, oval, or broadly spatulate, acute or obtuse, sharply dentate, often 



>. narrowed into a margined petiole; heads 15 -25 -flowered, 8-10 mm. high, numerous 

 in a terminal narrow often leafy thyrsus sometimes 3 dm. in length; rays 10-ic, 

 showy, 4-6 mm. long; tips of the involucral bracts green, acute or obtuse, all 

 ually strongly recurved; achenes glabrous. In rocky soil, N. B. and Ont. south 

 to Va. and Ohio. Aug. -Oct. 



2. Solidago petiolaris Ait. Downy Ragged Goldexrod. (I. F. f. 3672.) 

 Stem rather slender, pubescent or puberulent, 3-9 dm. high, simple or branched 

 "love. Leaves sessile, or very short-petioled, oblong to oval, acute, obtuse or 



aucronate. entire or dentate, 1-7 cm. long, rough or ciliate on the margins; heads 

 6-8 mm. high, in a terminal narrow more or less compound thyrsus ; & involucral 

 bracts with green acute to acuminate tips, the outer spreading, the inner appressed- 

 ihenes glabrous or nearly so. In dry soil, 111. to Kans. and Tex., east to N. Car.' 

 and Fla. Sept.-Oct. 



3. Solidago Wardii Britton. n. sp. Ward's Goldexrod. Stem puberulent. 

 1^9 dm. high. Leaves lanceolate to ovate-lanceolate, entire or with a few teeth, rather 

 firm, 5-9 cm. long, pale and silvery shining on both sides, or only above, the margins 

 qlliate; thyrsus 1-2 dm. long, sometimes quite leafy; heads short-peduncled. about 

 I mm. high, the bracts linear- lanceolate to linear-oblong, acute, distinctly squarrose 

 fcnescent; rays large, bright yellow. Mo. and Kan-, to Ark. and Ind. Terr. Sept - 

 Oct. Type collected by L. F. Ward, in Clark Co.. Kans., Oct. 2, 1897. 



4. Solidago caesia L. Blue-stemmed or Wreath Goldexrod. Wood, 

 axd Goldexrod. (I. F. f. 3673.) Stem glabrous, slender, often glaucous, usually 

 luish or purple, branched or simple, 3-9 dm. high. Leaves sessile, acuminate at 



•he apex, narrowed at the base, glabrous, sharply serrate; 5- 12 cm. long, 6-30 

 im. wide; heads 4-6 mm. high, in axillary clusters or racemes, or occasionally 

 'ith some in a short terminal thyrsus; bracts of the involucre obtuse- achenes 



