546 



COMPOSITAE. 



Vol. III. 



21. Senecio Smallii Britton. Small's Squaw- 

 weed Fig 4630. 



.V. aureus var. angustifolius Britton, Mem. Torr. Club 

 2: 39. 1890. Nut S. angustifolius VVilld. 1804. 



5. Smallii Britton, Mem. Torr. Club 4: 132. 1893. 



Similar to the preceding species but taller, grow- 

 ing in large clumps; stem ii-2i high, slender, 

 densely and persistently floccose-woolly at the base 

 and in the lower axils, or finally glabrate. Basal 

 leaves elongated-oblong or linear-oblong, obtuse or 

 acute, long-petioled, crenate-dentate, 3'-6' long, 

 3"-i2" wide, at first tomentose, at length nearly 

 glabrous ; stem leaves several, deeply pinnatifid, or 

 the lower lyrate, the uppermost very small; heads 

 very numerous, 4"-5" broad, about 2*" high, slen- 

 der-peduncled, forming large corymbs; rays 8-10; 

 achenes hispidulous ; pappus white. 



In meadows and thickets, southeastern Pennsylva- 

 nia to Florida and Alabama. May-June. 



22. Senecio densus Greene. Western Squaw- 

 weed. Fig. 4631. 



Senecio aureus var. cotnpactus A. Gray, Syn. Fl. I : Part 2, 



391. 1S84. 

 Senecio compactus Rydberg, Mem. Torr. Club 5: 342. 1893. 



Not T. Kirk. 

 Senecio densus Greene. Pittonia 4: 226. 1900. 



Perennial ; stem usually tufted, low, rather stout, 

 6-12' high, woolly at the base and in the lower axils, 

 or glabrous. Basal leaves linear-cuneate, entire or 

 3-toothed at the apex, 1-3' long, 2"s" wide, thick, 

 slender-petioled, the petioles commonly woolly-mar- 

 gined; lower stem leaves often much larger and broader, 

 usually laciniate or pinnatifid, but sometimes similar to 

 the basal, the uppermost very small and sessile; heads 

 several, 8"-io" broad, short-peduncled in a compact co- 

 rymb; rays 10-15; achenes hispidulous; pappus white. 



On dry plains, Manitoba to Nebraska, Colorado and Texas. 

 May-June. 



23. Senecio integerrimus Nutt. Entire- 

 leaved Groundsel. Fig. 4632. 



Senecio integerrimus Nutt. Gen. 2: 165. 1818. 



Perennial, more or less pubescent when young, 

 glabrous or nearly so when old; stem stout. l-4 

 high. Leaves entire, or sparingly denticulate, 

 somewhat fleshy, the lower and basal ones oval 

 or oblong, obtuse or obtusish at the apex, 3'-8' 

 long, l'-li' wide, petioled, the upper linear or 

 lanceolate, acute, the uppermost very small ; heads 

 numerous, corymbose, long-peduncled, 6"-io" 

 broad ; involucre nearly cylindric, 4"-S" high, its 

 principal bracts linear, acuminate, green, usually 

 with a few subulate outer ones ; rays 8-12, linear- 

 oblong; achenes nearly glabrous; pappus white. 



Iowa and Minnesota to Manitoba, Saskatchewan 

 and Wyoming. June-July. 



Senecio lugens Richards., of northwestern North 

 America, admitted in our first edition, is not defi- 

 nitely known to occur within our area. 



