Genus 8.] 



THISTLE FAMILY. 



315 



2. Kuhnia glutinosa Ell. Prairie 

 False Boneset. (Fig. 3635.) 



Kuhnia glutinosa Ell. Bot. S. C. & Ga. 2: 292. 



1821-24. 

 A'ut/niasuaveolens'Fresen. Ind. Sem. Francf. 1838. 

 Kuhnia eupatorioid.es var. corymbulosa T. &. G. 



Fl. N. A. 2:78. 1841. 



Stouter and often taller than the preceding 



species, corymbosely or paniculately branched, 



pubescent or tomentulose, somewhat viscid. 



Leaves all sessile, lanceolate to ovate-lanceolate, 



usually sharply serrate with distinct teeth, 



veiny, x'tf long, 3 // -io // wide; or those of the 



branches linear-lanceolate and entire; heads 



numerous, 6 // -8 // high, densely clustered in the 



cymes, their peduncles mostly short; inner 



bracts of the involucre lanceolate, acuminate; 



pappus tawny or brown. 



In dry soil, Illinois to South Dakota, Alabama 

 and Texas. Aug.-Oct. 



^^ 



8. LACINARIA Hill, Veg. Syst. 4: 49.pl. 46. 1762. 

 [Liatris Schreb. Gen. PI. 542. 1791.] 

 Erect perennial herbs, usually from a globular tuber, simple or little branched, with 

 alternate entire narrow i-5-nerved leaves, and spicate or racemose discoid heads of rose- 

 purple or white flowers. Involucre oblong, ovoid or subhemispheric, its bracts imbricated in 

 several series, the outer shorter. Receptacle flat, or slightly convex, naked. Corolla regu- 

 lar, its tube slender, its limb 5-lobed or 5-cleft. Anthers obtuse at the base. Style-branches 

 elongated, obtuse or flattened at the apex. Achenes 10-ribbed, slender, tapering to the base. 

 Pappus of 1 or 2 series of slender barbellate or plumose bristles. [Latin, fringed, from the 

 appearance of the heads.] 



About 16 species, natives of eastern and central North America, known as Blazing Star, or Button 

 Snakeroot from the globular tubers. 



X- Bracts of the involucre acute, acuminate or mucronate. 

 Involucre cylindric, or turbinate, 15-60-flowered, its base rounded. 

 Bracts with lanceolate spreading rigid tips. 

 Bracts mucronate, closely appressed. 

 Involucre oblong, or narrowly campanulate, 3-6-flowered. 

 Inner bracts with prolonged petaloid tips. 

 Bracts all acute, mucronate or acuminate. 



Bracts appressed; pappus-bristles very plumose. 



Leaves i"-2" wide; spike usually leafy below. 4. 



Leaves less than 1" wide; spike mostly naked. 5. 



Tips of the bracts spreading: pappus-bristles barbellate. 6. 



X- -x- Bracts of the involucre rounded or obtuse. 

 Involucre hemispheric, %'-i' broad, 15-45 -flowered; heads peduncled. 7. L. scariosa. 



Involucre oblong, 2"-4" broad, 5-15-flowered. 



Involucre rounded at base ; bracts usually not punctate ; heads mostly sessile. 8. L. spicata. 

 Involucre narrowed at base ; bracts usually very punctate ; heads peduncled. 9. L. graminifolia. 



i. Lacinaria squarrosa (L. ) Hill. Scaly 



1. L. squarrosa. 



2. L. cylindracea. 



3. Z,, elegans. 



L. punctata. 



L. acidota. 



L. pycnostachya. 



Blazing Star. Colic-root. 



(Fig. 3636.) 



Serratula squarrosa L. Sp. PI. 81S. 1753. 

 Lacinaria squarrosa Hill, Veg. Syst. 4: 49. 1762. 

 Liatris squarrosa Willd. Sp. PI. 3: 1634. 1804. 



Usually stout, y 2 -2 high, pubescent or glabrous. 

 Leaves narrowly linear, rigid, sparingly punctate, 

 3 / -6 / long, \"-zy z " wide; heads sessile or short-pe- 

 duncled, 15-60-flowered, usually few, or sometimes 

 solitary, Yz'-xy z f long, \"-W thick; bracts of the 

 involucre imbricated in 5-7 series, lanceolate, rigid, 

 acuminate, glabrous or pubescent, their tips spread- 

 ing; flowers bright purple; pappus very plumose. 



In dry soil, western Ontario to Kentucky and Florida, 

 west to Minnesota, Nebraska and Texas. Called also 

 Rattlesnake-master. June-Sept. 



