Helenikje. composite.. 363 



the base, but scarcely caudate. Pappus chatTy, the scaiious scales several 

 or numerous, and distinct, or sometimes none. — Leaves alternate or opposite. 

 (Chiefly American.) 



CONSPECTUS OF THE GENERA. 



Div. 1. Gaillardie.e. — Receptacle not chaffy, nor deeply favosa. 

 Suhdiv. 1. EcGAiLLARDiEJE. — Bi'anches of the style long and filiform, hispid. 



115. Gaillardia. Rays ligixlate, neutral. Achenia obpyramidal, involucrate 



with villous hairs. Pappus l-ner\'ed and awned. 



116. Palafoxia. Rays ligulate, pistillate, or none. Achenia mostly slender. 



Pappus 1-nerved, awnless. 



117. CH.ENACTIS. Rays, or exterior disk-flowers tubulose, inflated or palmate. 



J Achenia slender. Pappus nen'eless. 



Siibdiv. 2. EUHELENIE.E. — Branches of the style obtuse or truncate. 



* Raijs ligulate andfertik, or none. 



•K Receptacle flat or flattish. 



118. Hymenopappcs. Rays none. Achenia turbinate, substipitate, many-striate. 



Scales of the pappus short and obtuse, 12-20. Involucre somewhat 

 petaloid, spreading. 



119. Bahia. Rays 5-11. Achenia prismatic. Scales of the pappus 4-10, ob- 



long. Involucre appressed. 



120. AcTiNOLEPis. Rays 3-5. Achenia tei-ete. Pappus of the disk none, in the 



ray of 10-15 narrow acute scales. 



^- +- Receptacle conical, convex, or oblong. 



121. Lasthenia. Scales of the involucre united! Pappus of 5-10 scales, or 



sometimes none ! 



122. BuRRiELiA. Receptacle conical, papillose. Scales of the pappus equal, nar- 



row, subulate-awned, or sometimes none ! 



123. DICH.ETA. Receptacle conical, alveolate-toothed. Scales of the pappus 4-8 



oblong and obtuse, and about 2, which are subulate-awned. 



124. HvMENOXYs. Receptacle conical, alveolate. Scales of the pappus 5-12, 



oblong or lanceolate, acuminate or awned, rarely obtuse or none ! 

 Lobes of the disk-corolla nearly glabrous. 



125. AcTiNELLA. Receptacle hemispherical or conical, naked. Scales of the 



involucre ovate or lanceolate, appressed. Lobes of the disk-corolla 

 glandular-bearded. Scales of the pappus 5-12, ovate, 1-nerved, 

 awned. 



126. Amblyolepis. Receptacle flattish, alveolate. Scales of the involucre ovate, 



appressed. Scales of the pappus 5, obtuse, nerveless. 



127. Helenium. Receptacle convex or oblong, naked. Scales of the involucre 



linear or subulate, spreading or reflexed. Lobes of the disk-corolla 

 glandular-bearded. Scales of the pappus 5-8, apiculate or awned. 



* * Rays neutral. 



128. Leptopoda. Receptacle conical or hemispherical, areolate. Scales of the 



pappus mostly nerveless and awnless, denticulate or fimbriate. 



