CICHORIACEAE 306 



10. CRBPIS L. 



Upper stem-leaves with linear revolute merely sessile blades, i. C. teciorum. 

 Upper stem-leaves -with lanceolate or oblong flat clasping blades. 



Achene lo-striate : involucre mostly less than 8 mm. high. 2. C. virens. 



Achene 13-striate : involucre mostly over 8 mm. high. 3. C. biennis. 



1. Crepis tectorum L. Narrow-i,eaved Hawksbeard. (Man. 

 p. 902 ; I. F. f- 3556.) In waste places and in ballast, N. J. to Conn., 

 Ont., Mich, and Neb. — Pennsylvania : Bucks, Sellersville. 



2. Crepis virens L. Smooth Hawksbeard. (Man. p. 902 ; I. P. 

 / 3557-) 1° fields and wfiste places, Conn., N. Y., N. J. and Pa. and in 

 ballast about the seaports. Also on the Pacific Coast. Adv. from Eu.— 

 Pennsylvania: Northampton, Easton. 



3. Crepis biennis 1^. Rough Hawksbeard. (Man. p. 902 ; I. P'. 

 /■ 355^-) 1° waste places, Vt., Pa., and in ballast about the sea- 

 ports. Nat. or adv. from Eu.— /V««.y>'/fa»2a.- Northampton, Easton ; 

 Chester. 



11. hibracium i,. 



Inflorescence consisting of a single head : flowering stems leafless. 



I. H. Pilosella. 

 Inflorescence of several corymbose or paniculate heads : flowering stem leafy, 

 the leaves sometimes reduced to scales. 

 Stem more or less scape-like, terminating in a broad corymb or a narrow 

 panicle : leaves mainly or wholly on the lower part of the stem ; blades 

 of an obovate or spatulate type. 

 Corollas and ligules red or red orange. -i. H. auraniiacum. 



Corollas and ligules yellow. 

 Achenes columnar. 

 Longer involucral bracts glabrous or nearly so. 

 Flowering stems nearly naked, glabrous ; peduncles glabrous or 



sparingly glandular-pubescent. 3. H. venosum. 



Flowering stems leafy, pubescent at least below : peduncles densely 

 glandular-pubescent. 4. H. Marianum. 



Longer involucral bracts copiously pubescent. 

 Stem nearly leafless, glabrous to the inflorescence. 



5. H. Greenii. 

 Stem leafy below, hirsute. 8. H. scabrum. 



Achenes fusiform, or constricted below the summit. 



9. H. Gronovii. 

 Stem leafy to the inflorescence, not scape-like : leaf-blades of an oblong, 

 lanceolate or elliptic type. 

 Heads corymbose : principal bracts of the involucre in 2-4 series. 



6. H. Canadense. 

 Heads paniculate : principal bracts of the involucre in i series. 



7. H. paniculatum. 



1. Hieraoium Pilosella L. Mouse-Ear Ha wkweed. (Man. p. 903; 

 I. F. f. 3561.) Dooryards and fields, Ont., N. Y., Pa. and Mich. Adv. 

 from Eu. — Pennsylvania: Susquehanna; Northampton, Easton. 



2. Hieracium aurantlaoum L. Orange Hawkweed. (Man. p. 904; 

 I. F. f. 3564.') In fields, woods and along roadsides, N. B. and Ont. to 



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