OF ARTS AND SCIENCES. 33 



simplici. — Mountains of Alvarez, southeast of San Luis, August. 

 No. 3 ').">. In one form the large head is raised on a scape two feet 

 high, which hears only a few minute subulate bracts and one or two 

 small leaves at base ; the glabrous radical leaves ample and smooth ; 

 another has a several-leaved stem which is somewhat branched above, 

 the peduncles 3 or 4 inches long; and there are intermediate forms. 



Bacciiaris Seemanni. Glabra, sesquipedalis ; caulibus herbaceis 

 rigidis junceis striato-sulcatis pedalibus simpliciusculis e basi liguescente 

 monocephalis vel ramis paucis strictis capitulo pedunculato terminatis ; 

 foliis sparsis linearibus basi attenuatis rigidulis acutiusculis (majoribus 

 eesquipollicaribus lin. 1—2 latis), costa inconspicua ; involucro turbi- 

 nato vel oblotigo-campanulato, bracteis pluriseriatim imbricatis acutis 

 dorso viridibus marginibus anguste scariosis. — B. Wrightii, Schultz 

 Bip. in Seem. Bot. Herald, 303, non Gray. San Luis Potosi, near 

 streams, June. No. 411. Both sexes are in the collection; from 

 that of Seemann we have only the female. The species is com- 

 pletely different from B. Wrightii, has a narrower and fewer-flowered 

 involucre, the bracts of which are greener, more rigid, broader, and 

 merely acute ; and the habit is more junciform. 



Bacciiaris ramiflora. Frutescens, 1-3-pedalis, fere glabra, 

 glutinosa, foliosa ; ramis sulcato-striatis ; foliis lanceolatis seu lineari- 

 spatulatis basi attenuatis subpetiolatis subtriplinerviis acutis integerri- 

 mis nunc dentibus 1-2 instructis. majoribus tripollicaribus, ramulorum 

 parvis, ultimis bracteiformibus capitula racemoso-paniculata ramulos 

 terminantia fulcrantibus ; involucro campanulato (lin. 2-3 longo), 

 bracteis nudis lanceolatis acutiusculis vel fcem. obtusiusculis. — 

 Gravelly hills near streams, San Luis Potosi, June. No. 404, 412. 



Var. squarrulosa. Ramulis floridis ericoideo-foliosissimis ; 

 foliis (lin. 2-3 longis) recurvo-patentibus. With the other form. 

 No. 408. 



Bacciiaris Potosina. Fruticulosa, glabra ; ramis junciformibus 

 striato-angulatis ; foliis angusto-linearibus acutis inferne attenuatis 

 sessilibus subuninerviis integerrimis (majoribus sesquipollicaribus li- 

 neam vel semilineam latis) ; capitulis parvis (masculis lin. 2 fcemineis 

 lin. 3 longis) laxe paniculatis omnibus pedunculatis circiter 20-floris ; 

 involucro masculo campanulato e bracteis pauciserialibus lanceolatis 

 acutis subscariosis, foemineo fere oblongo e bracteis pluriserialibus 

 obtusis. — Borders of streams in the mountains. No. 410. Plants 

 apparently only a foot or two high, with somewhat the habit of 

 B. sergiloides, but with longer and slender leaves, more pedunculate 

 heads, narrower involucral bracts, &c. It should be compared with 

 vol. xv. (n. s. vii ) 8 



