CICHORIACEAE 303 



6. TRAGOPOGON L. 



Bracts of the involucre shorter than the ligules or merely equalling them ; 



corollas yellow. i. T. pratemis. 



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



.i. T. porrifolius. 



1. Tragopogon pratensiB L. Yei,i,ow Goat's-Beard. Meadow Sal- 

 sify. (Man. p. 895 ; I. F. / 3528. ) In fields and waste places, N. B. to 

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

 quehanna ; DELAWARE. 



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

 Beard. Salsify. (Man. p. 896; I. -p. f. 3^2^.) in fields and waste 

 places, Ont. to N. J., N. C, Minn, and Colo. Native of 'B,n.— Pennsyl- 

 vania : Northampton ; Bucks ; Montgomery. 



7. TARAXACUM Hall. 

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



outer involucral bracts reflexed. i. T. Taraxacum. 



Aehenes 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- /■ 353^-) 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. /. 3S33.) In fields and woods, Me. to Vt., southern 

 N. Y. and Pa. — Pennsylvania : Monroe ; Bucks ; Lancaster. 



8. SONCHUS Iv. 



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



1. 6'. arvensis. 

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



Acheue striate and transversely wrinkled : leaf-auricles acute. 



2. .S. oleraceus. 

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



• 3. 6'. asper. 



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

 / 3534-) In 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. y 3S3S-) In fields and waste places, throughout Am., except extreme 

 north. Nat. from Eu. — Pennsylvania: Northampton; Bucks; Dela- 

 ware ; Chester ; Lancaster ; Franklin ; Allegheny. 



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

 I. ^. /■ 3336.) Range of last. Nat. from Eu. — Pennsylvania: North- 

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

 Blair ; ALLEGHENY. 



