GknusS.] 



THISTLE FAMILY. 



315 



2. Kuhnia glutinosa Kll. Prairie 

 False Boneset. (Fig. 3635.) 



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



1821-24'. 

 Kuhnia suaveolens Fresen. Ind. Setn. Francf. 1838. 

 Kuhnia eitpatorioides var. corynibulosa T. &. G. 



FI. X. .\. 1: 78. 1S41. 



Stouter and often taller than the preceding 



species, corymbosely or paniculately branched, 



pubescent or tonientulose, somewhat viscid. 



Leaves all sessile, lanceolate to ovate-lanceolate, 



usually sharply serrate with distinct teeth, 



veiny, \'-}.' long, 3"-io" wide; or those of the 



branches linear-lanceolate and entire; heads 



numerous, 6"-S" 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, .\labania 

 and Texas. Aug.-Oct. 



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

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

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

 alternate entire narrow 1-5-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 I 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 .Vmerica, known as Blazing Star, or Button 

 Snakeroot from the globular tubers. 



-;t 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-flo%vered. 

 Inner bracts with prolonged petaloid tips. 

 Bracts all acute, mucronate or acuminate. 



Bracts appressed; pappus-bristles verv- plumose. 



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



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



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



-;r -^ Bracts of the involucre rounded or obtuse. 



Involucre hemispheric. ':'-r broad, 15-45-aowered; heads peduncled. 7. 



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



Involucreroundedatbase;bractsusually not punctate;headsraostly sessile. 8. L. spicala. 

 Involucre narrowed at base; bractsusuall3- very punctate; heads peduncled. 9. L. graminifolia. 



1. L. squarrosa. 



2. /.. cylindracea. 



3. L, elegans. 



L. punctata. 



L. acidola. 



L. pycnosiachya. 



L. scarinsa. 



I. Lacinaria squarrosa (L. ) Hill. Scaly 

 Blazing Star. Colic-root. (Fig. 3636.) 



Serratula squarrosa I.. Sp. PI. SiS. 1753. 

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

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



Usually stout, '/z°-2° high, pubescent or glabrous. 

 Leaves narrowly linear, rigid, sparingly punctate, 

 3'-6' long, \"-2'/2" wide; heads sessile or short-pe- 

 duncled, i5-6oflowered, usually few, or sometimes 

 solitary, '/t'-i'/i' long, 4"-S" 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. 



