28 PROCEEDINGS OF THE AMERICAN ACADEMY 



faces, and also by the habit. The genus falls into two sections ; one, 

 equivalent to Hopkirkia, DC, has only 3-5-flowere(i heads, generally 

 homogamous, sometimes a single ray-flower, and the akenes so broadly 

 obpyrumidal that the length is little more than double the width of the 

 summit, the angles very densely long-villous, and the faces (also 

 sparsely hairy) are more obviously striate-nerved at maturity : S. 

 Hopkirkia, Wislizeni, and Wrightii, Gray, two of them in Arizona, 

 the other only in Mexico. 



The section including the older species has narrower akenes, mod- 



98, &c. Paleae of the pappus thickened in centre to the middle or more. Rays 

 none. 



* * Leaves mainly opposite and with simple linear divisions : flowers with short 

 and apparently white rays : palea; of the pappus lanceolate, acute, and with 

 a complete but not excurrent costa. New IMexico. 



B. WooDiiousEi. — Achyropajipus Woodhousei, Gray, Am. Acad. vi. 540. Schkuh- 

 ria Woodhousei, Gray, Proc. ix. 199. 



* * * Leaves mostly alternate, 2-3-ternately dissected into narrow linear lobes : 

 stems slender, loosely branched : rays none : palete of the pappus oblong or 

 Woadly lanceolate, traversed by a complete costa, which in the alternate ones 

 is produced into a short bristle or awn, the others muticous or nearly so. 

 South American ; nearest Schkuhria, but the flowers numerous, involucre 

 broader, and akenes linear-clavate. 



B. Gii.LiESii. — Schkuhria multijlora, Hook. & Arn. in Jour. Bot. iii. 322. 

 S. anthemoides, Griseb. PI. Lorent. 139 (S. pusilla, id. Symb. Argent. 199, at 

 least in part, excl. syn., but not S. pusilla, Wedd. Chi. And. Ko. 72 of Man- 

 don's ri. And. Boliv. (I have not 73) is of this species or very near it, certainly 

 is neither B. anthemoides, nor Schkuhria pusilla, Wedd., whicli is not a genuine 

 Schkuhria, but perhaps an Ambli/opappus. 



* * * * Leaves all or mostly alternate, 2-3-ternately divided or parted, the 

 divisions or lobes from linear-spatulate to obovate : stem simple, compara- 

 tively stout, bearing several or rather numerous somewhat corymbosely 

 cymose many -flowered heads at tiie naked summit: rays conspicuous, yel- 

 low : involucre hemispherical: paleaj of the pappus (when present) with 

 distinct costa. S. W. North American species, of closely similar aspect. 



•*- Pappus of 10 to 14 paleffi, with costa in some evanescent below the apex, 

 in others excurrent : tube of the disk-corollas glandular, but not hirsute ; 

 the lobes ovate or oblong and shorter than the dilated throat. Species of 

 Schkuhria § Achi/ropapjnis, Gray, in Proc. Am. Acad. ix. 199. 



B. PEDATA, Gray, PI. Wright, i. 132. 



B. BiTEKNATA, Gray, PI. Wright, ii. 95. 

 4--t- Pappus none: tube of corollas viscid-hirsute : lobes of those of the disk 



almost cqualhng the throat and tube together: plant more robust, sometimes 



4 feet high. 



B. ciiRYSANTHEMOiDES. — Villanova chrysanthem aides, Gray, PI. Wright, ii. 96. 

 Amauria ? dissecla. Gray, PI. Fendl. 104. 



