538 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Flowers not yellow. 



Akenes beaked ; pappus l)rown, plumose; flowers violet. Tragopooon (p. 539). 

 Akenes beakless. 



Pappus a crown of short scales; flowers l)luo Cichorium (p. 538). 



Pappus plumose; flowers pink or white Ptiloria (p. 539). 



Flowers yellow. 



Receptacle chafi"y ; pappus hi-istles pkunose, not broad- 

 ened at base IlYPOCHAERis(p.54r). 



Receptacle naked; pappus scale-like, or the bristles 

 broadened at base. 



Heads nodding when young; scales 15 to 20, each 



bearing a very plumose awn Ptilocalais (p. 541). 



Heads erect even when young. 



Pappus of plumose or subplumose bristles 

 slightly enlarged at base. 



Heads solitary on bractless scapes or 



peduncles Scorzoneli.a (p. 540). 



Heads usually several on branching 



bracteolate scapes Leontodon (p. 541). 



Pappas of chafl'-like scales. 



Scales 20 to 24, linear-lanceolate, not 



awTied NoTHOCALAis (p. 540) . 



Scales 5 to 10, awned, the awn rising 



from the notched apex Uropappus (p. 539). 



Bristles of pappus capillary, never plumose. 

 Heads solitary; leaves all basal. 



Akenes smooth at apex, beakless or long-beaked Agoser's (p. 541). 



Akenes spinulose at apex, long-beaked Taraxacum (p. 545). 



•Heads several; leaves not all basal. 

 Akenes flattened. 



Flowers yellow; akenes truncate, not beaked Sonchus (p. 549). 



Flowers blue, pink, or yellow; akenes narrow at 



summit or beaked Lactuca (p. 548). 



Akenes terete, cylindric or prismatic. 



Pappus white, persistent Crepis (p. .545). 



Pappus tawTiy. 



Flowers yellow (or in one .species white) .... Hieracium (p. 546). 

 Flowers pinkish Nabalus (p. 548.) 



LAPSANA. 



1. Lapsana communis L. Sp. PI. 2: 811. 1753. 



Type locality: European. 



Specimens examined: Seattle, Piper in 1888; west Klickitat County, Svlsdorf 146; 

 Vancouver, Piper, July 10, 1899. 



CICHORIUM. 



1. Cichorium intybus L. Sp. PI. 2: 813. 1753. Chicory. 



Type locality; "Hab. in Europa ad margines agrorum viarumque." 

 Specimens examined; Seattle, Piper in 1892. 



