38 PROCEEDINGS OF THE AMERICAN ACADEMY 



inferioribus oppositis ; pedunculis gracilibus ; capitulis (vix semipolli- 

 cem diametro) subglobosis ; involucri bracteis disco dimidio brevioribus; 

 ligulis brevibus 10-12; acheniis glabris tenuiter 2-aristatis basi attenu- 

 atis ala scariosa cinctis. — Ravines near San Luis Potosi, July. 

 No. 474. 



Calea albida. C rugosce (Calydermati rugoso, DC.) affinis ; 

 ramis hirsutis ; foliis lato-ovatis grosse obtuse dentatis supra scabro- 

 birtellis subtus pubescentibus rugoso-reticulatis ; capitulis paucioribus 

 multo majoribus (lin. 4 longis) plerisque pedunculatis 20-Horis ; flori- 

 bus aut omnibus hermapbroditis aut uno alterove fcemineo brevi- 

 ligulato ; involucro late campanulato, bracteis oblongis obtusis, extimis 

 laxis subberbaceis pubescentibus brevioribus, casteris membranaceis 

 albidis tenuiter nervosis glabris disco adaequantibus ; corollis ut videtur 

 albis ; acbeniis birsutissimis basi stipitato-attenuatis ; pappo e paleis 

 10—12 lanceolatis eroso-denticulatis tubo corollas adaequantibus. — A 

 densely branched suffruticose plant, on gravelly soil near San Luis, 

 August. No. 448. The capitula have the bitter-aromatic odor and 

 taste of hops. The ray when present does not surpass the disk-corollas. 



Calea (Tephrocalea) touentosa. Foliis cordatis obtusis in- 

 tegerrimis quintuplinerviis et venosis petiolatis supra tenuiter subtus 

 ramisque dense albido-tomentosis ; pedunculis terminalibus mono- 

 cephalis ; capitulo subgloboso ; involucro pauciseriali tomentoso disco 

 dimidio breviore, bracteis ovatis subasquilongis ; receptaculo conico ; 

 pappi paleis 5 lanceolatis acutis achenio dimidio brevioribus. — Col- 

 lected by Dr. Palmer on the route between San Luis and Tampico. 

 No. 1108. This species has female ray -flowers ; but the scanty heads 

 seen are in such condition that their number (evidently few) and the 

 form of the ligule cannot be well ascertained. In aspect unlike any 

 known Calea, except the following in Coulter's collection. 



Galea (Tephrocalea) discolor. Foliis oblongis mucronatis 

 integerrimis basi vix subcordatis petiolatis penninerviis subtriplinerviis 

 venulosis supra glabris lucidis subtus ramisque tomento minuto (pri- 

 mum flavescente) incanis ; pedunculis 1-3-floris ; involucro turbinato- 

 campanulato glabro pluriseriali disco subdimidio breviore, bracteis 

 subulato-lanceolatis ; receptaculo augusto conico; ligulis 8-10 (lin. 

 4-5 longis) oblongis 5-nervatis ; pappi paleis 4-5 parvis subulatis. — 

 No. 351 of Coulter's Mexican collection, distributed from the herba- 

 rium of Trinity College, Dublin. The flowers are yellow ; the larger 

 leaves 3 or 4 inches long. 



Tridax Palmeri. Hirsutulo-puberula ; caule erecto bipedali 

 ramoso ; foliis (superioribus saepe alternis) pinnatifido-incisis vel 3-5- 



