30 PROCEEDINGS OP THE AMERICAN ACADEMY 



acheniis pubescentibus. — Foot-hills of the mountains near San Luis, 

 May or June. The simple stems, from six to eighteen inches high, 

 rise from a firm and knobby caudex. No. 349. 



Brickellia squamulosa. B. spitiulosce affinis, fruticosa, pube 

 minutissima tomentulosa cinerea ; ramis gracilibus elongatis fastigiatim 

 ramulosis ; foliis (caulina desunt) ramulorum minimis (vix lineam 

 longis) linearibus seu oblongis squamiformibus plerisque tetrasticho- 

 imbricatis ; capitulis ramulos terminantibus ; involucro clavato-turbi- 

 nato 10-12-floro e bracteis pluriserialibus gradatim imbricatis extus 

 canescentibus obsoletissime striatis acutiusculis, intimis lineari-lanceo- 

 latis, extimis brevibus ovatis ; acheniis glaberrimis ; pappo rariter 

 hirtello-scabro. — Abundant in gravelly soil, near San Luis Potosi, 

 forming large clumps, two or three feet high, May to July. No. 356. 

 Head half an inch long, including the outermost series of bracts, 

 which pass into the squamaceous leaves. 



Brickellia thyrsiflora. Herbacea e basi frutescente puberula, 

 subviscosa ; caule (1-3-pedali) ramosissimo apice pyramidato-ramoso 

 ramisque floridis polycephalis foliosissimis ; foliis alternis lato-lanceo- 

 latis basi apiceque acutis vel acuminatis vix petiolatis integerrimis sca- 

 bridis, venulis utrinque reticularis ; capitulis thyrsoideo-paniculatis 

 numerosis breviter pedicellatis erectis (semipollicaribus) ; involucro 

 cylindraceo 10-14-floro e bracteis gradatim imbricatis extus glanduloso- 

 puberulis, omnibus obtusissimis vel mucronulato-acutis, intimis lineari- 

 oblongis, extimis late ovalibus ; acheniis ad costas parce hirtellis ; 

 pappi setis supra medium barbellulatis. — Mountains southeast of 

 San Luis Potosi, Aug. No. 362. 



B. Palmeri. Herbacea, scabrido-puberula ; caule ramoso pedali ; 

 foliis (superioribus) subalternis ovatis vel deltoideis paucidentatis 

 scabris rigidulis subtus reticulatis breviter petiolatis parvulis ; capitu- 

 latis sparsis in pedunculo gracili (ultrasemipollicari) erectiusculis ; 

 involucro campanulato 12-15-floro ; bracteis interioribus lineari- 

 lanceolatis exquisite acuminatis glabris (lin. 5 longis), exterioribus 

 multo brevioribus latioribus subviscoso-puberis acutis ; acheniis pubes- 

 centibus. — Near San Luis Potosi. No. 354. This should be com- 

 pared with B. (Bulbostylis, DC.) reticulata, which would be a good 

 name for it ; but the leaves of our plant are coarsely toothed, and the 

 heads can hardly be said to be racemose, nor the pubescence velvety. 

 The lower leaves may be cordate.* 



* Brickellia Skemanni. Ramis lierbaceis simplicibus puberulis, apice 

 nudo capitula G-8 unilateraliter spicata nutantia confertim gcrcnte ; pedieellis 

 brevissimis bractea parva suffultis; involucro circiter 25-floro, bracteis tcnuiter 



