352 COMPOSITE 



the disk-rflowers hermaphrodite and fertile, rarely some infertile, with 

 regular 4-5-toothed tubular corolla. Receptacle naked, or fimb filiate. 

 Bracts of the involucre herbaceous or membranaceous, not scarious. 

 Style-branches of the hermaphrodite flowers with .either truncate or 

 appendiculate tips. Pappus paleaceous or aristiform, or sometimes 

 plurisetose, but the bristles when capillary always more or less rigid. 



Subtribe i jAUMiEiE Involucre of broad bracts, imbricated in 

 two or more series. 



58 Janmea Involucre campanulate : leaves opposite, connate at base, 

 narrow, fleshy. 



Subtribe ii Helenie^: Involucre hardly at all imbricated : 

 its bracts when broad nearly equal or in a single series. 



* Achenes linear or linear-cuneate, 4-angled or compressed, but not 

 with cartilaginous margins. 



■*- Receptacle conical or convex, rarely flat: involucre of few or sev- 

 eral erect appressed or united herbaceous bracts. 



++ Rays few, very short and included, rarely conspicuous, or none. 



59 Lasthenia Receptacle conical : bracts of the involucre united into a 

 I0-15-toothed cup : pappus none. 



■** ** Rays exserted and spreading. 



60 Baeria Receptacle high-conical, minutely muricate : bracts of the in- 

 volucre distinct, flat, in a single series. 



61 Eriophyllum Receptacle flat to conical : involucre many-flowered, its 

 bracts strictly erect, not membranaceous, more or less carinate- concave 

 in fruit and partly embracing the subtending achene : pappus of nerve- 

 less and mostly pointless paleae. 



62 Bahia Receptacle small, mostly flat; involucre 12-20-flowered, its 

 bracts not colored nor scarious-tipped, plain or merely concave, not 

 embracing achenes : pappus of several scarious paleae with callous- 

 thickened opaque base. 



63 Hymenopappus Receptacle flat: Involucre many-flowered; its bracts 

 mostly appressed, with scarious-membranaceous and usually colored 

 tips : pappus of 10-20 mostly hyaline obtuse paleee. 



-*- •*- Receptacle flat : bracts of the involucre narrow, chiefly linear 



*+ Heads with regular ligulate and pistillate rays 



64 Rigiopappus Involucre campanulate, rather many-flowered: rays 

 short and inconspicuous : pappus of 4-5 rigid paleaceous awns. 



*+ *+ Rays wanting but the marginal corollas sometimes enlarged 



65 Chaenactis Involucre campanulate or hemispherical : pappus of blunt 

 hyaline scales, rarely wanting. 



*+ *+ *+ Ray-flowers ligulate and pistillate, mostly conspicuous. 



66 Hulsea Involucre hemispherical, very many-flowered, of very num- 

 tm tum erous linear bracts : pappus of 4 short hyaline blunt and nerveless paleae. 



* * Achenes turbinate or obpyramidal : disk-flowers all fertile. 



*■ Involucre bracts erect or appressed : achenes hirsute or villous. 



