103 CICHORIACEAE. 



L. scariolci L. PrU-Mlij L. Stem 2-5 feet high, prickly below, glabrous above: 

 leaves lanceolate to oblong 1 or oblanceolate. sagittate-clasping-, spinulose- 

 denticulate or sinuate-toothed, midrib prickly; achenes obov ite-oblong, 

 strinte-nerved, beak slightly longer than the acbene. Waste ground; July- 

 September: becoming frequent throughout the state. 



L. ludoviciana (Nutt.) DC. Stem :?-."> feet high, branched, glabrous, leafy; 

 leaves oblong 1o ovate-oblong, acute, auriculate-elasping. spinulose-dentieu • 

 late, sinuate-lobed or pinnatifid; heads many, loosely paniculate; .lowers 

 yellow; achenes oval or obovate, flat, about the length of the filiform beaks. 

 River banks; July-September: reported from Muscatine, Emmet, Story, and 

 Winnebago counties. 



* * Leaves neither g piny-man lined nor with spiny midrib*; sometimes spinulosc in 



h. integrifolia. 

 % Achenes thin, pit; berths filijo rm; pavers yellow, blue in L. pulchella. 



L. canadensis L. Wild. L. Stem 3-8 feet high, strict, smooth, glaucescent, 

 leaves long, sinuate pinnatifid, pale beneath, the margins entire or sparingly 

 dentate, midrib naked or sparsely bristly; achenes oval. 1-nerved, beak 

 slightly shorter. Rich soil; fields and open places; July-September; com- 

 mon. 



L. hirsuta Muhl. Stem 2-3 feet high, reddish, somewhat hairy; leaves 

 mostly runcinate pinnatifid, hairy on both sides, or midrib hairy, denticulate. 

 Forms from Winneshiek county possessing the above characters are referred 

 to this species. 



L. integrifolia Bigelow. Stem 3-4 feet high, smooth, panieulately- 

 branched above; leaves undivided, oblong, oblong-lanceolate or lanceolate, 

 acuminate, denticulate or entire, auriculate-clasping; flowers yellow or pur- 

 plish; achenes oval, longer than the beak. Rich soil; August-September; in- 

 frequent; Decatur, Taylor, and Ringgold counties: reported from Dickinson 

 county. (L. sitijiltifolia Ell.) 



L. pulchella (Pursh) DC. Perennial, glabrous, somewhat glaucous: stem 

 slender. 1-3 feet high, branched above; leaves linear-lanceolate, lanceolate, or 

 oblong, acute, entire, dentate, lobed or pinnatfid, the cauline sessile or partly 

 clasping, the lower sometimes petioled; heads many, rays bright b'lue or vio- 

 let; achenes oblong-lanceolate, twice the length of the' tapering- beaks. 

 Fields and waysides; June-September; common in western Iowa, infrequent 

 elsewhere; Fremont, Montgomery, and Pottawattamie counties; veported 

 from Lee, Henry, Poweshiek, Story, Kossuth, and Woodbury counties, 

 f f Achenes thUHsWi, beitldess or with, slunt necks; flower* blue. 



I_. acuminata Gray. Stem glabrous. 2-(> feet high: leaves ovate-oblong or 

 oblong--lanceolate. frequently sagittate or hastate, simply or doubly toothed, 

 acuminate, wing-petioled; achenes beakless. Open woods; August-Septem- 

 ber: frequent; Clayton. Dubuque, Johnson, Des Moines, and Decatur coun- 

 ties. (L. villosu J acq.) 



L. floridana (L.) Gaertn. Stem 4-8 feet high, smooth; leaves large, wing- 

 petioled, deeply lyrate-pinnatifid. lobes simply or doubly dentate, lateral 

 lobes ovate, terminal deltoid, acuminate; flowers blue: involucre about one- 

 half inch high: pappus bright white; achenes thickish, acuminate, short- 

 beaked. Rich soil, woods; August-September; frequent. 



L. leucophaea Gray. Stem 3-12 feet high, glabrous; leaves deeply lobed 

 or pinnatifid, dentate, teeth mucronate-pointed, sessile or the lower petioled, 

 glabrous, sometimes pubescent on the veins beneath; panicle large, rather 

 dense; heads many: rays blue; achenes oblong; compressed, short beaked: 



