Trelease.J 300 [March 17, 



to the pointless elliptical anthers that ar.e 1 mm. long. Achenia 

 8-15, short-stipitate, obliquely obovate, flattened, with 8-10 low, 

 often forked nerves approximately parallel to the arched ventral 

 margin; 4-5 mm. long and 2-3 wide, tipped by a beak \-% as 

 long, that is continuous with the nearly straight dorsal margin. 

 Stigma elongated, unilateral. — Alaska and British Columbia, ex- 

 tending into the mountains of Colorado and California. From 

 northern Asia. 



Varies from glabrous throughout to glandular-pubescent on the 

 achenia and the lower surface of the leaflets. This is T. clavatum 

 of Hooker's Fl. Bor. Am. i. 2, and T. Bichardsonii, Gray, Amer. 

 Journ. Sc. xlii, 37. 



4. T. minus, L. var. Kemense. T. flavum, 1, Kemense, Fr. Fl. 

 Hall, i, 94. T. Kemense, Fr. Mantissa, in, 48. — Erect, stout- 

 stemmed, 1-2 ft. high, subsimple ; glabrous or glaucous. Leaves 

 2-3-ternate, the lower short-petioled. Leaflets moderately firm, 

 short-petioled, oval and narrowed to the base, once-twice 3-lobed 

 at the summit, the pointed lobes divergent. Flowers perfect, 

 erect on thickened pedicels in a strict panicle. Stamens 15-20 

 their filaments slender, elongated ; anthers oblong, mucronate, 

 3 mm. long. Achenia 6-8 or fewer, sub-sessile, obliquely ovoid, 

 subterete, about 6-grooved. Stigma broadly sagittate. — Alaska. 

 From Europe and Asia. 



The American plant is stricter and thicker-leaved than Asiatic 

 specimens. 



5. T. purpurascens, L. Sp. PI. 546. — Stem stout, tall, green or 

 purple, leafy. Leaves ample, 3-4-ternate, the lowest petioled. 

 Leaflets remote, short-stalked, firm ; the upper surface dark-green ; 

 large (1-2 in.), mostly oblong or oblong-cuneate, with 3 commonly 

 entire pointed lobes above. Flowers of medium size, in a p3 r ram- 

 idal panicle, nearly dioecious. Stamens numerous, their long 

 filaments widened to the linear-oblong cuspidate anthers that are 

 2-3 mm. long. Achenia numerous, densely clustered, short-stip- 

 itate ; thin-walled, with 6-8 sharp longitudinal wings, those at the 

 sutures most prominent; ovoid, 3-4 mm. long, tapering into the 

 slender, persistent style. Stigma long and narrow. — From Can- 

 ada to Florida and Texas ; west to Arizona, Montana and Sas- 

 katchawan. 



Varies from glabrous or granular to pubescent or glandular- 

 pubescent. When prominently glandular and with a graveolent 



