352 COMPOSITE 



the disk-flowers hermaphrodite and fertile, rarely some infertile, ivith 

 regular 4-5-toothed tubular corolla. Receptacle naked, or fim irillate. 

 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, Jaumie^. Involucre of broad bracts, imbricated in 

 two or more series. 



58 Janmea Involucre campanalale : leaves opposite, connate at baae, 

 narrow, fleshy. 



SuBTRiBE II Helenie^ Involucrs hardly at all imbricated; 

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



* Achenea 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. 



69 Lasthenia Receptacle conical : Bracts of the involucre united into a 

 10-lo-toothed cup: pappus none. 



■M- **Rays exserted and spreading. 



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

 volucre distinct, flat, in a single series. 



61 Eriophylinni 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 palese. 



62 Bahia Receptacle small, mostly flat: involucre 12-20-flewered, its 

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

 embracing achenes : pappus of several scarious palese with callous- 

 thickened opaque base. 



63 Hymenopappns Receptacle flat: involucre many-flowered, its bracts 

 mostly appressed) with scarious-membranous and usually colored tips : 

 pappus of 10-20 mostly liyallue obtuse paleae. 



-<- -1- Receptacle flat: bracts of the involucre narrow, chiefly linear. 



•*•• Heads with regular ligulate and pistillate rays. 



64 Rigiopappns Involucre campanulate, rather many-flowered: rays 

 short and inconspicuous : pappus of 4-6 rigid paleaceous awns. 



-"• ** Rays wanting but the marginal corollas sometimes enlarged. 



65 Chsenactis Involucre campanulate oi hemispherical: pappus of blunt 

 hyaline scales, rarely wanting. 



-H- *•• -»» Kay-flowers ligulate and pistillate, mostly conspicuous. 



66 Hnlsea Involucre hemispherical, very many-flo«ered, of numerous 

 linear bracts; pappus of 4 short hyaline blunt and nerveless palese. 



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



-1- Involucral bracts erect or appressed ; achenes hirsute or villous. 



