644 



CICHORIACEAE 



Heads 6-12 flowered; involucre very narrow, 8-12 mm. 



high. 

 Heads 12-20 flowered; involucre broader. 

 Leaves neither spiny margined or with spiny midribs. 



Achenes very thin, flat, contracted into filiform or tapering 

 beaks. 

 Leaves, or some of them pinnatifid. 



Plant glabrous throughout, 1-3 m. high. 

 Leaves, at least their midribs, hirsute. 



Beak of the achene as long as its body; flowers 



yellow. 1 



Beak of the achene less than half as long as 

 its body; flowers blue. t 



Leaves entire or dentate, none of them pinnatifid. 



Leaves oblong or oblong-lanceolate; achene longer 



than the beak. t 



Leaves lanceolate; achene about equalling the 

 beak. 5 



Achenes beakless or with short necks, thickish; flowers blue. 

 Leaves oblong to ovate, acuminate, dentate. ( 



Leaves pinnatifid, the terminal segment commonly 

 triangular. ; 



Pappus brown; flowers blue to white. j 



L. virosa L. (L. Scariola L.). In fields and waste 

 to S. Dak., N. J., Ga., Neb., Colo, and Kan. 

 Europe. 



Locally abundant as a weed, often wanting. 



L. virosa. 



L. sagittifolia. 



2. L. canadensis. 



3. L. hirsuta. 



4. L. Morssii. 



5. L. sagittifolia. 

 2. L. canadensis. 



6. L. villosa. 



I. 



. L. floridana. 

 . L. spicata. 



places: Me. 

 Native of 



2. L. canadensis L. In moist open places: N. S. to the N. W. 



Terr., south to Ga., Ala., La. and Ark. 



Throughout the range, except in the pine-barrens, apparently 

 there rare. ' A high mountain form with all the leaves entire has 

 been collected in Pa. and in the Catskills; it is L. canadensis 

 montana Britton. 



3. L. hirsuta Muhl. In dry soil: Me. and Ont. to Minn., south 



to Ala. and Tex. 



Conn. Rare near the coast, apparently wanting northward. 



N. Y. L. I. and S. I., occasional in the Bronx, unknown elsewhere. 



N. J. Not uncommon on the coastal plain, wanting or very rare 



elsewhere. 



Tertiary, common: Cretaceous, less common: Older Formations, 

 scattered. 168-220 days. About sea level. 



4. L. Morssii Robinson. Along salt meadows: Me. and eastern 



Mass. to N. Y. 



