352 COMPOSITE 



the disk-flowers hermaphrodite and fertile., rarely some infertile, with 

 regular 4-5-toothed tubular corolla. Receptade naked, or fimbrillate* 

 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^E Involucre of broad bracts, imbricated in 

 two or more series. 



58 Jaumea Involucre campanula te: leaves opposite, connate at base, 

 narrow, fleshy. 



SUBTRIBE ii HELENIE^E 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 

 IO-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 caririate-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-flowered, 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 Hymenopappus Receptacle flat : Involucre many-flowered; its bracts 

 mostly appressed, with scarious-membranaceous and usually colored 

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



*- *- 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 Cheenactis Involucre campanulate or hemispherical : pappus of blunt 

 hyaline scales, rarely wanting. 



M. Ray-flowers ligulate and pistillate, mostly conspicuous. 



66 Hulsea Involucre hemispherical, very n> any-flowered, of very num- 

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



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

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



