Tiusti.k Family. !K! 



natcly dissected, segment* oblong', deeply pinuatitid: heads small, in an ample 

 panicle. Waste places; July-September; infrequent. Muscatine and Deca- 

 tur counties; reported from Keokuk county. 



A. biennis Willd. lStennial: stem simple, erect. 1-4 feet high, glabrous: 

 leaves 1-2-pinmttely divided: divisions linear, entire or cut-toothed; lieads 

 globular, erect, in axillary spikes, collectively in a narrow leafy panicle. 

 Dry soil; August-September; frequent. 



I' f Lciii'cs vcrratc or entire, mil jnnn(itlH<i. 



A. serrata Xutt. Perennial: stem leafy. ii-U feet high; leaves lanceolate, 

 serrate, whitened beneath, the upper often linear: heads small, few-flowered, 

 greenish llottom lands: August-September: frequent: Winneshiek, Jack- 

 son, and Muscatine counties: reported from Fayette. Poweshiek. Story. Win- 

 nebago, and Cerro llordo counties. 



A. gnaphalodes Xutt. Perennial: whole plant woo'.ly-canescent; stein :.'- 

 4 feet high, branched: leaves lanceolate, entire, or lower toothed or pinnali- 

 tid, upper surface usually glabrate and green: heads ovoid, small, mostly ses- 

 sile, in narrow leafy panicles. Sandy and prairie soil; August-September: 

 common. {A. ItntiiiUciiinit ijtMitltttiaili'* T. it tr.) 



SENECIO li. Herbs, with alternate leaves, solitary or eorymbed heads, 

 and mostly yellow liowers. Heads many-flowered; flowers all tubular and 

 perfect or else the marginal ligulate and pistillate. Involucre of many equal 

 erect-con ui vent scales, sometimes with a few braetlets at the base. Recepta- 

 cle flat, naked, l'appns of copious soft capillary bristles. 



S. aureus L. (InUlcn Rmjirmt. Perennial: stems 1-3 feet high, glabrous or 

 woolly when young: radical leaves thin, simple, orbicular or ovate-oval, 

 crenate-toothed. long-petioled: lower lyrate-pinuatifid: upper sessile or partly 

 clasping, dentate or incised: rays s-l-.'. Wet woods and meadows: May- 

 June; Johnson couuty: reported from Winneshiek. Fayette. Story, and Wood- 

 burr counties: perhaps frequent and widely distributed but has b-'en confused 

 with the following. 



S. balsamitae Muhl. Stems a few inches to two feet high: radical leaves 

 oblong or spatulate. varying to lanceolate, tapering to the petiole, serrate, 

 upper lanceolate, laciniate or pinnatifid. petioled or the uppermost sessile. 

 Dry and rocky "oods: May-July: common: Winneshiek, Allamakee. Scott. 

 Johnson, Decatur, and Shelby counties; reported from Fayette. Muscitlne, 

 and Story counties. (S. iturrux hdlmmiUW T. & O.) 



S. obovatUS Muhl. Steins 1-3-feet high: leaves rather thick, the basal 

 obovate or spatulate, very obtuse, base cuneate. creuate-dentate. with short 

 margined petioles, or the earliest nearly sessile in rosnlate tufts: stem leaves 

 few, sessile, oblong to spatulate. incised or piunatifid. Wet prairies; April- 

 June: reported from Story county. (8. duirus nlmnitus T. A- It.) 



S. lugens Richards. Stem stout. 1-3 feet high: basal and lower leaves ob- 

 loiiw. oval or slightly spatulate. denticulate, narrowed iuto margined petioles, 

 upper leaves sessile, bract like: heads corymbose: involucral scales lanceolate 

 or oblong-lanceolate, with black tips. Moist soil: June-August: reported 

 from Plymouth county. 



S. palustris Hook. Annual or biennial: stem 0-20 inches high, woolly or 

 villous, sometimes at length glabrate; leaves oblong-lanceolate, toothed or 

 laciniate, the upper cordate clasping; involucre naked below: rays many, 

 pale vellow: pappus copious. Wet ground: June-August: Eininet, and Cerro 

 Uordo counties; reported from Dickinson couuty. 



