32 PROCEEDINGS OF THE AMERICAN ACADEMY 



gono-obpyramidatis pube densa sericca incanis apice truncatis disco car- 

 tilagineo integro parum cupulato coronatis. — Near San Luis Potosi, 

 where it is common on gravelly hills, July. No. 3G9. 



Bigelovia orrosiTiFOLiA. Cltrysolhamnopsis, anomala, frutex 

 ramosissimus, pumilus, glabellus ; foliis oppositis ! petiolatis crasso- 

 coriaceis lanceolato-oblongis cuspidato-acutis rariter acute dentatis 

 trinervatis et obsolete venosis punctatis glutinosis (semipollicaribus) ; 

 capitulis subsolitariis ramos ramulosque breves foliosos terminantibus 

 intra folia sessilibus ; involucro 20-25-floro e bracteis aequilongia 

 chartaceo-coriaceis paucistriatis acutis 2-3-seriatis, exterioribus lato- 

 lanceolatis, intimis linearibus ; corollis angustis hreviter 5-dentatis; 

 sty li ramis appendice filiformi parte stigmatosa ocquilatadnplo longiori; 

 acheniis angustis 4-5-angulatis puberulis pappo rigidulo uniseriali 

 parum brevioribus. — Rocky hills near San Luis Potosi, May. No. 

 359. Head half an inch long. This must needs be referred to Bige- 

 lovia, but it is remarkable for the opposite leaves and the equal bracts 

 of the involucre. 



Aster Potosinus. Orthome ris, totus glaber; caulibus gracilibus 

 e caudice repente 8-18-pollicaribus ; foliis omnibus gramineis linearibus 

 integerrimis, imis (2-5 pollicaribus lin. 2 latis) basi attenuatis ; cauli- 

 nis plerisque e basi latiori semiamplexicauli subulato-attenuatis ; 

 qapitulis paucis ; involucri 3-4-seriatis bracteis gradatim imbricatia 

 adpressis lanceolatis acutis margine albido-scariosis dorso viridibus ; 

 ligulis ut videtur albis ; styli fl. herm. ramis brevibus latis, appendice 

 ovato-subulata parte stigmatosa parum breviore ; ovariis parce pubes- 

 centibus. — Along brooks in the mountains of San Luis Potosi. No. 

 384. Heads smaller than those of A. paucijlorus (A. caricifolius, 

 HBK.) ; the bracts of the involucre imbricated in the manner of 

 A. Sonorce, &c. 



Aster (Mach^eranthera) gtmnocepiialus. Aplopappus gymno- 

 cephalus, DC. Prodr. v. 346. Machcerunthera setigera, Nees in Lin- 

 ncea, xix. 722 ? The rays are bright violet-purple. (See Plants 

 Wrightiante, i. 97.) No. 379. 



Erigeron Palmeri. Euerigeron, glabcllum ; caule e radice perenni 

 erecto gracili (1-2-pedale) aut aphyllo monocephalo ant inferno 

 foliato nunc sat foliato, pedunculis 2-3 elongatis monoce})halis : foliis 

 integerrimis vol grosse pauciserratis, radicalibus spathulato-oblongis 

 obtusis crassiusculis (4-5-pollicaribus) in petiolum gracilem sensim 

 attenuatis, caulinis (raro pollicaribus) oblongo-lanceolatis sessilibus ; 

 involucro e bracteis lineari-lanceolatis acutis vel acuminatis ocquilongia 

 parum pubescentibus ; ligulis 80-90 (semipollicaribus albis ?) ; pappo 



