300 COMPOSITE, (composite family.) 



ing loose corymb ; leaves all radical or near the base, oboA-ate or oblong, nearly 

 entire, scarcely petioled, thin and pale, purplish and glaucous underneath 

 (often hairy along the midrib), marked above with purple veins ; pedicels very 

 slender; involucre 12-35-flowered; achenes linear. — Dry plains and pine 

 woods ; common from the Atlantic to Minn, and Iowa. 



4. H. Mari^num, Willd. Somewhat leafy, 2-3° high, hairy below; 

 leaves obovate-oblong, narrowed below, the radical petiolate, rarely purplish- 

 veiny ; heads 20-40-Howered in a very open cymose panicle, the slender inflo- 

 rescence commonly ichitish-tomentulose and sparingly glandular-hispid. — Open 

 Avoods and clearings; K. I. to western N. Y., and southward. — Var. spathu- 

 LA.TUM, Gray, a mountain form with leaves all or mainly radical and very 

 hairy. On Two-top Mountain, Penn. 



5. H. SCabrum, Michx. Stem rather stout (1-3° high), leafy, ro;/^/i- 

 halry, the stiff panicle at first racemose, at length rather corymbose ; tlie thick- 

 ish pedicels and the hoary 40-5'0-flowered involucre densely clothed with dark 

 glandular bristles ; leaves obovate or oval, nearly entire, hairy. — Dry open 

 woods ; common. 



* * Achenes tapering upward; heads l5-30-floivered in a narrow or virgate 



panicle. 



6. H. Gron6vii, L. (Hairv H.) Stem wand-like, mostly simple (l -3° 

 high), leafy and very hairy below, naked above and forming a long and narrow 

 panicle ; leaves oblong or obovate, nearly entire, hairy ; slender peduncles and 

 involucre sparingly glandular-bristly; achenes with a very taper summit. — Dry 

 sterile soil; common, especially southward. 



7. H. longipilum, Torr. (Long-bearded H.) Stem wand-like, sim- 

 ple, stout (2-3'^ liJg^')) '■'''7/ ^f'"f:i toward the base, naked above, and bearing a 

 small racemed panicle ; the lower portion and both sides of the oblong-lanceo- 

 late or spatulate entire leaves thickly clothed with very long and upright bristles 

 (often r long) ; peduncles and involucre glandular-bristly; achenes narrowed 

 at the apex. — Prairies, Mich, to Minn., and southwestward. 



90. CREPIS, L. 



Involucre few -many -flowered, commonly of a single row of equal scales, 

 often becoming thickened at base. Pappus copious, white and soft. Annuals 

 or biennials, not pilose. Otherwise as Hieracium. (The Greek name of some 

 ])lant, from Kpr^iris, a sandal.) 



C. BIENNIS, L. Somewhat pubescent, 2° high, leafy ; leaves runcinate-pin- 

 natifid ; heads rather large, corymbose ; achenes oblong, glabrous. — Vt., Mass. ; 

 rare. (Nat. from Eu.) 



C. tect6rum, L. Slender, branching from the base, 1° high; leaves nar- 

 row, runcinate ; heads small, in a loose panicle ; achenes fusiform, the ribs sca- 

 brous. — In fields, Lansing, Mich., and on ballast. (Nat. from Eu.) 



91. P RE WANT HE S, Vaill. Eattlesnake-root. 



Heads 5-30-flowered. Involucre cylindrical, of 5 to 14 linear scales in a 

 single row, and a few small bractlets at base. Achenes short, linear-oblong, 

 striate or grooved, not contracted at the apex. Pappus of copious straw-color 

 or brownish and rough capillary bristles. — Perennial herbs, with upright 

 leafy stems arising from spindle shaped (extremely bitter) tubers, very variable 



