CICHORIACEAE 303 



6. TRAGOPOGON L. 



Bracts of the invohicre shorter than the Hgules or merely equalling them : 



corollas yellow. i. T. praten\is. 



Bracts of the involucre much longer than the ligules : corollas purple. 



2. T. porrifolius. 



1. Tragopogon pratensis L,. Yellow Goat's-Beard. Meadow vSal- 

 SIFY. (Man. p. 895 ; I. V.f.3^28. ) In fields and waste places, N. B. to 

 N. J., Ohio and Man. Nat. from Eu. — Pennsylvania: Monroe; Sus- 

 quehanna ; Delaware. 



2. Tragopogon porrifolius L. Oyster Plant. Purple Goat's- 

 Beard. Salsify. (Man. p. S96 ; I. F. /jj-'p.) In fields and waste 

 places, Ont. to N. J., N. C, Minn, and Colo. Native of Eu. — Petmsyl- 

 vania : Northampton ; Bucks ; Montgomery. 



7. TARAXACUM Hall. 



Achenes greenish brown, the beak fully twice or thrice as long as the body : 

 outer involucral bracts reflexed. i. T. Taraxacum. 



Achenes red, the beak less than twice the length of the body : outer involucral 

 bracts ascending or spreading. 2. T. erythrospermum. 



1. Taraxacum Taraxacum (L.) Karst . Dandelion. (Man. p. 896; 

 I. F. f. 3^32.) Perhaps indigenous northward, southward nat. from Eu. 

 Also in Asia. — Pennsylvania : Northampton ; Bucks ; Philadelphia ; 

 Delaware ; Chester ; Lancaster ; Allegheny. 



2. Taraxacum erythrospermum Andrz. Red-seeded Dandelion. 

 (Man. p. 896 ; I. F. y. 3S33-) In fields and woods, Me. to Vt., southern 

 N. Y. and Pa. — Pennsylva?iia : Monroe ; Bucks ; Lancaster. 



8. SONCHUS L. 



Bracts of the involucre glandular-pubescent : heads about 25 mm. high. 



1. S. at'Z'/rnsis. 

 Bracts of the involucre glabrous : heads 12-16 mm. high. 



Achene striate and transversely wrinkled : leaf-auricles acute. 



2. 5". ol/rraceiis. 

 Achene merely ribbed, not transversely wrinkled : leaf-auricles rounded. 



3. S. asper. 



1. Sonchus arvensis L. Corn Sow-ThisTle. (Man. p. 897; I. F. 

 f. 3S34-) 111 low grounds, fields and roadsides, Newf. to Minn., N. J., 

 and at Great Salt Lake, Utah. Nat. from Eu. — Pennsylvania : North- 

 ampton ; Philadelphia. 



2. Sonchus oleraceus L. Annual Sow-Thistle. (Man. p. 897 ; I. 

 F. / 3535-) In fields and waste places, throughout Am., except extreme 

 north. YiQ.\.. irom^M.— Pennsylvania : Northampton; Bucks; Dela- 

 ware ; Chester ; Lancaster ; Franklin ; Allegheny. 



3. Sonchus asper (L-) All. Spiny Sow-ThistlE. (Man. p. 897; 

 I. '^.f.3536.) Range of last. Nat. from Eu. — Petmsylvania : North- 

 ampton ; Bucks ; Delaware ; Chester ; Lancaster ; Franklin ; 

 Blair ; Allegheny. 



