OF ARTS AND SCIENCES. 433 



Cacalia raduLjEfolia, HBK. Rio Blanco, grassy slopes and 

 bottoms ; October. (689.) 



Cnicus Mexicanus, Hemsl. (Cirsium, DC.) Guadalajara, in 

 moist bottoms ; July. (274.) — " Cardo santo " ; the flowers are 

 sometimes used in cheese-making instead of rennet. 



Pbrezia Wislizeni, Gray, PI. Fendl. Ill, and Proc. Amer. 

 Acad. 19. 58, var. megacephala. A form with still larger heads 

 than the original, an inch and a half broad ; stem leafy up to the 

 involucre. Rio Blanco, on grassy hillsides, rare; October. (655.) 



Perezia rigida. Gray, PI. Wright. 1. 127. A less rigid form. 

 Rio Blanco, hillsides and ravines; October. (661.) 



Perezia vernonioides, Gray, n. sp. Inter species subdiv. * * * 

 conspecti in Proc. Amer. Acad. 19. 58 collocanda : caule ultra-bipedali 

 usque ad apicem folioso hirsutulo apice cum cyma nuda polycephala 

 glabro; foliis oblongis chartaceis basi obtusissima parumve subcordata 

 subsessilibus subtus laxe venoso-reticulatis glabriusculis supra hispidulo- 

 scabris obsolete serrulatis vel denticulatis, majoribus 4-pollicaribus ; 

 capitulis lin. 5 longis 9-12-floris ; involucro subturbinato, bracteis 

 pluriseriatim gradatim imbricatis chartaceis nitidulis sensim acumina- 

 tis, interioribus lanceolatis, extimis brevissimis subulatis; corollis 

 roseis ; pappo (immaturo) albo. — Rio Blanco, in shaded grassy 

 bottoms ; October. (745.) Seemingly a very distinct species. The 

 heads show no disposition to cast off the iuvolucral bracts; but they 

 are still young. 



Pyrrhopappus multicaulis, DC. (-P. paucijlorus, DC.) Rio 

 Blanco, in moist bottoms ; June. (66.) 



Pinaropappus roseus. Less, Rio Blanco, near water-courses ; 

 June. (30.) 



Lobelia subnuda, Benth. PI. Hartw. 44. Rio Blanco, on moist 

 shady river banks ; June. (43.) 



Lobelia laxiflora, HBK., var. angtjstifolia, DC. Rio 

 Blanco ; June. (45.) — Also a tomentulose form between L. ovali- 

 folia and L. lanceolata, Hook. & Arn. Guadalajara ; August. (298.) 



Lobelia fenestralis, Cav. Rio Blanco, in rich wet bottoms ; 

 August. (339.) 



Palmerella tenera, Gray, n. sp. Annua, glabra; caule gracili 

 simplici spithamceo ; foliis imis oblongis rotundisve minimis, caeteris 

 linearibus subdenticulatis (majoribus fere pollicaribus) ; corollas tubo 

 tenui (lin. 3 longo) basi hinc gibboso calycis segmentis 3-4-plo lon- 

 giore, lobis ligulato-oblongis, tribus emarginato-truncatis cum apiculo 

 medio, fauce ad sinus eorum bituberculatis ; ovario capsulaque ovato- 



VOL. XXII. (N. S. XIV.) 28 



