THE FLORA OF IOWA. 41 



brous, often scabrous, the lower oblong-ovate, repand-toothed, the 

 upper lanceolate, acute; heads not bracteate; scales of the involucre 

 all with pectinate appendages; rays elongated, the segments very 

 long and slender. Flor. N. A. 



Common in cultivation, and native in Southern U. S. Plant 2- 3^ 

 high, with very large, showy heads. Flowers pale purple. 

 CMCrs, L. 



(CiRSiUM, Tourn., of Gray's Manual.) This change is the result 

 of a more exhaustive study of the genus and leaves the synonymy as 

 given in the body of the Catalogue. It does not otherwise effect the 

 species enumerated. See Gray's Rev. of Thistles in Proc. Am. Ai. 

 IX. &- X. 



( HEJ'IS, L. 



Heads several-many-flowered; flowers all ligulace. Involucre us- 

 ually calyculate with a few small bracteoles, the proper scales nearly 

 equal, in a single series. Receptacle naked or slightly hairy. Ache- 

 nia terete or somewhat compressed, 8 30 striate, usually narrower 

 above or even tapering into a short beak, the apex expanded into a 

 minute disk. Pappus pure white, copious, of denticulate or scabrous 

 delicate capillary bristles, or sometimes of more rigid bristles slightly 

 dilated toward the base. 



489. C RUNCINATA, Torr. & Or. - Perennial, slightly hirsute, be- 

 coming smoother; radical leaves obovate or oblong lanceolate, run- 



cinate-lobed or only slightly toothed, tapering to the base, 2'- 7' 

 long; scape I""^ 2° high, branching, bearing a few linear, bract-like 

 leaves; branches and involucres more or less hirsute with blackish, 

 often glandular, hairs; involucres many-flowered, -calyculate; scales 

 linear-lanceolate, with scarious margins; achenia striate, slightly ta- 

 pering upwards. Fior. CoL^ Port. (^ Coul. 



493. Lactuca Ltdoviciana, DC— Very smooth (3-5- high); 

 leaves all runcinate, retrorsely and sharply toothed, the cauline 

 partly clasping; panicle divaricate, the peduncles and involucre 

 naked; pappus conspicuously stipitate; flowers yellow. Flor. N. A. 



It is doubtful if this be distinct from Miilgedium pitlchelluni., Nutt. 



570. Lycopus RUBELLtJS, Mcench. - Nearly glabrous; stem weak, 

 sub-erect (i"^ 2^ high), obtusely angled; leaves petioled, ovate- 

 oblong or oblong-lanceolate, much acuminate at both ends; calyx 

 teeth triangular awl-shaped, not rigid. (L. Eiirop<eus, L., var. integ- 

 rifolius. Gray.) (Jrny's Pev. Lye, Proc. .Am. .4c., 1870. 



571. Lycopus ll'cidus, Turcz. Stem stout {2^ 3^ high), erect, 

 acute-angled at top; leaves lanceolate or oblong-lanceolate (2'- 4' 

 long), acute or acuminate, with large and very sharp serrations, the 

 base obtuse, or occasionally acute, subsessile; calyx teeth alternate, 

 subulate. 



Var. AMERICANO'S, Gray. - Leaves barely shining on both sides, 

 often hairy pubescent; stem generally hairy; calyx teeth small and 

 rigid. I&id. 



572. Lycopus sinuatus. Ell. ~ Stem acutely 4-angled; leaves 

 lanceolate or oblong, acute, irregularly incised and laciniate-pinna- 

 tifid, sinuate, dentate at the point, attenuate at the base, on mode- 

 rately long petioles; calyx teeth trian^lar, subulate, short cuspidate; 

 rudimentary stamen filiform, capitate, or clavate at the summit. {L. 

 EtiropcEus, L., var. sinuatus. Gray.) Jbid. 



578. Salvia lanceolata, Willd.— Stem herbaceous, ascending 

 and with the branches, glabrous; leaves petioled, lance-linear, ob- 

 tuse or acuminate, base narrow; bracts lance-subulate, shorter than 



