Flora of the Palouse Region 175 



flowers usually entire; ovary biearpellary, inferior, 1 -celled, 1- 

 ovuled, with basal placenta: fruit an akene sometimes surmounted 

 by the pappus, often compressed at right angles to the subtending 

 chaff (laterally compressed) or compressed parallel to the chaff 

 [obcompressed). 



Corollas ligulate in all the flowers of the head: plants with milky juice. 



Tribe 1. cichorieae. 

 Corollas tubular in all the flowers or ligulate in only the marginal ones: 

 plants without milky juice. 

 Style-branches of perfect flowers flat and tipped with a distinct flat ap- 

 pendage: anthers without tails: leaves all alternate. 



Tribe 3. asteroideak. 

 Style-branches of perfect flowers neither truncate nor tipped with any 

 appendage: anthers with tails: head with two kinds of flow- 

 ers: receptacle not long-bristly: corollas not deeply cleft. 



Tribe 4. inueoideae. 

 Style-branches of perfect flowers truncate-capitate or tipped with an 

 appendage: anthers without tails: leaves or some of them 

 often opposite. 

 Receptacle chaffy, at least next the margin: involucre not scarious: 

 pappus not capillary. 

 Stamens free from each other or nearly so. 



Tribe 2. ambrosieae. 

 Stamens united into a ring around the style. 



Tribe 5. heeianthoideae. 

 Receptacle not chaffy: involucre not of imbricated scarious scales: 



pappus not capillary. Tribe 6. HELENOiDEAE. 



Receptacle not chaffy, or rarely so: involucre of imbricated partly 

 scarious scales: pappus a short crown or none. 



Tribe 7. anthemideae. 

 Receptacle not chaffy: pappus capillary and copious. 



Tribe 8. SENECIONIdeae. 

 Style-branches without tips or appendages, more or less grown together 

 to or near the apex: corollas all tubular and very deeply 

 sometimes irregularly 5-cleft into long linear lobes: recep- 

 tacle densely bristly: anthers sagittate or with tails. 



Tribe 9. cynaroideae. 



Tribe r. CICHORIEAE. 



Pappus chaffy or none. 293. MlCROSERis. 



Pappus plumose. 



Flowers yellow; stemless or short-stemmed. 293. MlCROSERis. 



Flowers pink or white, leafy-stemmed and branching. 



294. STEPHAXOMERIA. 

 Flowers yellow or purple, leafy-stemmed and usually branching. 



295. TRAGOPOGON. 

 Pappus of capillary bristles, not plumose. 



Akenes flat or flattish. 



Akeues narrowed at the summit or beaked. 299. eacttca. 



Akenes truncate, not beaked. 298. SONCIHS. 



Akenes columnar or terete, not flattened. 



Akenes beaked, 



