LuTRis. LXXV. COMPOSITE. 317 



C. ccELESTlNUM. DC. (Coelcstina ccerulea. Spreng. Eupatorium celes- 

 tinum. Linn.) — Herbaceous, nearly glabrous, much branched ; lis. deltoid- 

 ovate, truncate or subcordate at base, tapering to an obtusish apex, crenate- 

 serrate, veiny ; petioles slender, about half as long as the lamina ; corymbs nu- 

 merous, subumbellate ; scales numerous, setaceous. — Hedges, thickets, roadsides, 

 &c., Penn. and S. and W. States! Stem 1 — 2if high, terete, with opposite 

 branches. Leaves 1 — 2i' long, § as wide. Flowers 20 — 50 in a head, of a 

 light or sky-blue, reddish in fading. Aug. Sept. 



7. LIATRIS. 



Gr. Xi, an emphatic prefix, arptoj, invulnerable; used as a viilnerary. 



Flowers all tubular ; involucre oblong, imbricate ; receptacle naked ; 

 pappus plumose, copious ; achenia obconic, 10-striate; styles much 

 exserted. — % herbs or shrubs. Root tuberous. St. simple. Lvs. 

 alternate. Fls. cyanic. 



* Heads 16 — 60-Jlowered. 



1. L. sauARRosA. Willd. Blazing Star. 



Smooth or scabrous- pubescent ; lvs. linear, lower ones attenuated at base ; 

 rac. flexuous, leafy ; hds. few, sessile or nearly so ; invol. ovate-cylindric ; scales 

 large, squarrose-spreading, outer larger, leafy, inner mucronate-acuminate, 

 scarce!}' colored ; fls. numerous ; pappus plumose. — A splendid plant, native 

 (in N. Y. according to Prof. Eaton) Penn. to Flor. and W. States ! Stem 2 

 — 3f high, thickly beset with long, linear leaves. Heads 5 — 20, with brilliant 

 purple flowers. Aug. f 



2. L. CYLINDRACEA. Michx. 



St. low, slender and very leafy, smooth or somewhat hirsute; lvs. rigid, 

 linear, mostly 1-veined ; hds. few, sessile or pedicellate, cylindrical, 15 — 20- 

 flowered ; scales short, close, rounded or obtuse and abruptly mucronate at apex. — 

 Prairies and barrens, Mich, to Mo. Stem 6 — 18' high. Leaves 2 — 5' by 2 — 4". 

 Heads 1' long, rarely solitary, sometimes 10 or 12, mostly about 5. Flowers 

 bright purple. 



3. L. scARiosA. Gay Feather. 



Scabrous-pubescent ; lvs. lanceolate, lower on long petioles, upper linear 

 and much smaller ; hds. remotely racemed ; invol. globose-hemispherical ; scales 

 obovate, very obtuse, purplish ; fls. numerous ; pappus scabrous. — A beautiful 

 plant, 4 — 5f high, in woods and sandy fields, Mass. {Rickard!) to 111. ! and La. 

 Stem rather stout, whitish above. Leaves numerous, entire, lower 3 — 9' long, 

 upper 1 — 3' by 1 — 3", rough-edged. Heads 5 — 20, V diam., in a long raceme, 

 each 20 — 40-flowered. Corolla purple. Aug. f 



* * Heads 5 — Ib-fl^wered. 



4. L. GRAMiNiFOLiA. Willd. Torr. & Gray. Grass-leaved Liai/ris. 

 Glabrous or with scattered hairs ; st. slender and simple ; lvs. linear, 1- 



veined ; hds. 7 — 12-flowered, spikes or racemes sometimes paniculate below ; 

 involucre acute at base ; scaks many, obtuse, appressed, outer row shorter; ach. 

 hairy. — N. J. to Ala. 



/?. ■? dubia. (L. pilosa. /?. dubia. Ph. L. dubia. Bart.) Inflorescence 

 sometimes compound below, or partly paniculate. — Pine barrens, N. J. Stem 

 2— 3f high. Leaves 3—6' by 2 — 4". Heads rather small. Sept. Oct. 



5. L. SPICATA. Willd. Slender-spiked Liatris. 



Lvs. lance-linear, smoothish, punctate, ciliate, lower ones narrowed at 

 base ; hds. in a long, terminal .spike, nearly sessile ; Ifts. of the invol. oblong, 

 obtuse ; fls. about 8 ; pappus scabrous-plumose. — Native from N. J. and Mich. ! 

 to Flor. and La. Abundant in prairies. A beautiful species, often cultivated. 

 Stem 2 — 5f high. Heads numerous, with bright purple flowers. Aug. f 



0. resinosa. T. & G. (L. resinosa. Nutt.) Plant smaller; hds. about 5- 

 flowered. 



6. L. PYCNOSTACHYA. Michx. Tldck-spiked Liatris. 



Simple, more or less hirsute, very leafy; lvs. rigid, ascending, .straight. 



