CI CR HJ A CEAE. M )9 



6. TRAGOPOGON L. Goat "s-beard. 



Flowers yellow; involucval bracts equiilling or shorter than the rays. 



1. T. pratensis. 

 Flowers purple; invohicral brMcts much longer tlian the rays. 



2. T. porrifolius. 



1. TRAGOPOGON PRATENSis L. Yellotv Goiit 's-heaid. M. p. 895. Fields and 



waste places. Sununer and fall. 

 Z>etott'a/-e— "Wawa. 



2. TRAGOPOGON PORRIFOLIUS L. OiiHtcr-pkiut, Salsify. M. p. 895. Escaped 



from cultivation. Summer and fall. 



Philadelphia— Girard Point (Ja.), "Neck" (VP.). i^wcAs— Sellers- 

 ville (Fr.) (Ja.). Montgomery — Betzwood (Br.), Ivy Rock (Wn.). 

 Delaware SwaTthmoi-e (Pr.) (Ws.), Concord (W. Tr.). Northampton^ 

 (P.). 



il/o/f/*iOMi/i — Freehold (C). //u/(^erdo« — Rosemont (C). 



7. TARAXACUM Hall. Dandelion. 



Achenes greenish. 1. T. Taraxacum. 



Achenes red. • 2. T. erythrospermum. 



1. Taraxacum Taraxacum (L.) Karst. M. p. 89G. Fields and waste 



places. All year. 



2. Taraxacum erythrospermum Audrz. M. p. 896. Fields and woods. 



Spring. 



8. SONCHUS L. Sow-thistle. 



Involucre glandular-pubescent; heads nearly 25 mm. high. 1. S. arvensis. 

 Involucre glabrous ; heads 12-16 mm. high. 



Auricles of leaves acute, achenes striate and transversely wrinkled. 



2. S. oleraceus. 

 Auricles rounded ; achenes ribbed, not transversely wrinkled. 



3. S. asper. 



1. SoNCHUs ARVENSIS L. M. p. 897. Salt marshes and ballast. Summer. 



Philadelphia — "Neck," Louis Schneider (Ja.). Northampton— (F.). 

 Camden— Kaighn's Point. Caj^e Mai/— Cape May (Te.). Monmouth — 

 Asbury Park (Br.) (Fu.) (Wn.), Atlantic Highlands, Scobyville (C). 

 New Castle — Corn-fields near Collins' Beach, Commons and Tatnall. 



2. SoNCHUS OLERACEUS L. Co'minon Sow-thistle. M. p. 897. Waste places 



and cultivated grounds. Summer and fall. 



3. SoNCHUS ASPER (L.) All. M. p. 897. Waste places. Summer. 



9. LACTUCA L. Lettuce. 



Pappus briglit white. 



Leaves spiny-margined and often with spiny or hispid midribs; flowers 

 yellow. 

 Heads 6-12-flowered; invohici'e very narrow, 8-12 mm. high. 



1. L. virosa. 

 Heads 12-20-flowered ; involucre broader. 4. L. sagittifoUa. 



Leaves neither spiny-margined nor Avith spiny midribs (rarely spinulose 

 in No. 3). 

 Achenes very thin, flat, contracted into filiform or tapering be:iks. 

 Leaves, or some of them, pinnatifid. 



Plant glabrous throughout, 1-3 mm. high. 



2. L. Canadensis. 



