538 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Flowers not yellow. 



Akenes beaked ; pappus brown . plumose ; flowers v iolet . Traqopooon (p. 539) . 

 Akenes beakless. 



Pappus a crown of short scales: flowers blue. . . . Ciciiorium (p. 538). 



Pappus plumiwe; flowers pink or white Ptiixjria (p. 539). 



Flowers yellow. 



Receptacle chaffy : pappus bristles plumose, not broad- 

 ened at base HYPOCHAERis(p.541). 



Receptacle naked; pappus .scale-like, or the bristles 

 broadened at ba.se. 



Heads nodding when young: .scales 15 to 20, each 



l)earing a very plunio.s(^ awn I^tilooalaks (p. 541). 



Heads erect even when young. 



Pappus of plumose or subplumoso bristles 

 slightly enlarged at base. 



Heads solitary on bractle.ss scapes or 



peduncles Scorzonella (p. 540). 



Heads iLsually several on branching 



bractcoiate scapes Leontodon (p. 541). 



Pappus of chafi'-like scales. 



Scales 20 to 24, linear-lanceolate, not 



awned 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 spinulo.se at apex, long-lx>aked Taraxacum (p. 545). 



Heads several; leaves not all basal. 

 Akenes flattened. 



Flowers yellow; akenes truncate, not l>eaked. . . . SoNCiius (p. 549). 

 Flowers blue, pink, or yellow; akenes narrow at 



summit or l)eaked Lactuca (p. 548). 



Akenes terete, cylindric or prismatic. 



Pappus white, persistent Crepis (p. 545). 



Pappus tawny. 



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, Suksdorf 146; 

 Vancouver, Piper, July 10, 1899. 



CICHORIUM. 



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



Type ix)cality: "Hah. in Europa ad margines agrorum viarumque." 

 Specimens examined: Seattle, Pi-per in 1892. 



