844 ^ CARDUACEAE 



usually sharply dentate^ veiny, 3-7 cm. long; heads numerous, 12-16 mm. high; 



outer bracts lanceolate, attenuate; pappus taw-ny. K. eupalorioides corymbu- 



losa T. & G. Dry prairies and plains: 111.— Ala.— Tex.— Colo.— Mont. Plain. 

 Je-0. 



2. K, Hitchcockii A. Nels. Stem decumbent, divaricately branched, min- 

 utely puberulent; leaves lam?e-linear or linear, puberulent, entire or with few 

 sharp teeth, 3-4 cm. long; outer bracts linear-lanceolate, long-attenuate, or the 

 ^--er narrowly linear; pappus tawny. Dry plains: Kans.— Colo. Plain. Au-S. 



3. K. reticulata A. Nels. Stems 3-4 dm. high, finely puberulent; leaves 



inn 



4r-5 



veins beneath, punctate 



2-4 cm. lone-, irrfto-nlnrl 



the inner broadly hnear, acute; pappus white. Canons: Wyo. SuhmonL Au! 



4. K. leptophylla Scheele, Stems 5-8 dm. high, striate and minutely puberu- 

 lent; leaves numerous, minutely puberulent, Hnear or lance-hnear, 2-4: cm. long, 

 entire or nearly so, revolute-margined; inflorescence paniculate; bracts in 5 

 series, the outer short, lanceolate, the inner linear, cuspidate; achenes strigose; 

 pappus dingy white. K. Gooddingii A. Nels. Rocky hills: Colo.— Tex,— Ariz. 

 Son. — SubmonL Jl-S. 



6. LACINIARIA Hill, Blazing Star, Button Snake-root. 



Perennial herbs, with a globular conn or thickened rootstock. Leaves narrow, 

 entire, alternate, more or less punctate. Heads discoid, racemose or spicate, 

 with rose-purple or rarely white flowers. Involucre oblong to hemispheric; 

 bracts more or less herbaceous, not striate, imbricate in several unequal series. 

 Receptacle flat or nearly so, naked. Anthers obtuse at the base. Style-branches 

 ?A ^^l^^', ^^^^^^> flattened at the end, stigmatose only at the base. Achenes 

 10-ribbed, slender, tapering to the base. Pappus 1-2 series of equal, firm, plu- 

 mose or'barbellate bristles. [Liatris Schreber.] 



Pappus plumose, 



II^H« p-GO-flowered; coroUa-lobes hairy within. 1. L. squarrosa. 



Heads 4-6-flowered: corolla-lobes glabrous within. 2 L vunctata 



Pappus merely barbellate. i/uf(ti«<u. 



Heads few, hem1s;pheric. 15-45-flowered. 



Heads in a short raceme-like or corymbiforra inflorescence; bracts obovate, with 



a dark rose-purple laciniate apex; leaves usually glabrous. 3. L. liguUstylis. 

 Meads m a long spike-like inflorescence; bracts spatulate or obovate-oblanceolate. 



with a pale merely erose apex; leaves usually hispidulous or crisp-hau-y. 



Heads oblong, 3-15-flowored, numeroiis in a long spike. 



Bracts obtuse, appressed. 5 x, spicata 



Bracts acute, their tips spreading. 6'. L. pycnostachya. 



1. L. squarrosa (L.) Hill. Stems often tufted, pubescent, 

 leaves numerous, Hnear, 3-30 cm. long, often with scattered hairs; heads soli- 

 tary or few, subtended by bract-Uke leaves; involucres cylindric, 1.5-2 cm. high; 

 bracts lanceolate or oblong or hnear-acuminate, squarrose-spreading. Liatris 

 squarrosa (L.) WiWd. Sandy soil: Ont.—Fla.— Tex.— Colo.— Minn. Plain. Jl-S. 



2. L. punctata (Hook.) Kuntze. Stem glabrous or nearly so, 2-7.5 dm. 

 high; leaves strongly punctate, 1-nerved, ciliate on the margins, otherwise gla- 

 brous, hnear; spike dense, elongate, 5-15 cm. long; heads 12-16 mm. long, sessile; 

 mvolucres narrowly campanulate; bracts cuspidate or acuminate, ciliate on the 

 margins; flowers purple or rose. Liatris punctata Hook. Dry plains and hills : 

 bask.— la.— Tex.— Ariz.— Alta. Plain— Mont. Au-0. 



3. L. ligulistylis A. Nels Stem glabrate below, white-pubescent above. 



1-6 



dm 



5-12 cm. long; heads 15-20 



campanuiate or tiemispHenc; bracts orbicular or oval; flowers 50-70, purple. L. 

 formosa Greene. HiUs: Man.— S.D.— Colo.— Mta. Plain— SubmonL Jl-Au. 



4. L. aspera (Michx.) Greene. Stem 3-10 dm. high, crisp-hairj- especiaUy 

 above; leaves numerous, the lower linear-oblanceolate, the upper linear; heads 

 globose-campanulate, 15-18 mm. high; bracts orbicular or oval. Liatris aspera 



