OF ARTS AND SCIENCES. 321 



6 lines). Near San Luis Potosi (154 Schaffiier, in part) ; 13 Parry 

 & Palmer. 



Erysimum asperum, DC. In the Sierra Madre, Coahuila (48). 



Thklypodium loxgifolium, "Watson. Hispid below with spread- 

 ing hairs : lower leaves unknown, the upper narrowly linear : sepals 

 glabrous, broad and very concave, 2 to 2!, lines long; petals a little 

 longer, oblong, scarcely narrower below: pod very slender, 1^ to 2i 

 inches long by ^ line broad, beaked by the slender style, spreading or 

 usually pendent upon the slender pedicel (3 to G lines long). — In the 

 San Miguelito Mountains (156 Schaffner, in part). This is 52 Ilart- 

 weg, 687 Coulter, and perhaps 22 Fendler. 



Thkltpodium micranthum. {Streptanthus micranthus, Gray.) 

 Biennial, erect (2 to 3 feet high), more or less stellately pubescent: 

 lower and cauline leaves oblanceolate, sinuately pinnatifid, stellately 

 pubescent, attenuate to a petiole, the upper linear, entire, usually 

 glabrous: flowers smaller than in the last (1 to 1^> lines long), the 

 calyx glabrous or pubescent : pod slender, about an inch long, 

 sessile, nearly terete, the style very short and thick, ascending or 

 sometimes pendent, on pedicels 2 to 4 Hues long. — In the Sierra 

 Madre, Coahuila (37), and at San Luis Potosi (156 Schaffner, in 

 part). This includes 23 Fendler, 844 Wright, 610 Rothrock, and 281 

 Pringle, all of which have been referred to the preceding species, 



Thelypodium auriculatum. {Sisymbrium auriculatum, Gray.) 

 In the Sierra Madre, Coahuila (25), and at Lerios (50). The only 

 partially incumbent cotyledons, together with the characters of the 

 pods and flowers, and the general habit, seem to require the transfer 

 of this species to Thelypodium. 



Thelypodium linearifolium, Watson. At Saltillo (36). 



Eruca sativa. Lam. At Saltillo (2144), and near San Luis 

 Potosi (152 Schaffner) ; 16 Parry & Palmer. 



Greggia camporum, Gray. At San Lorenzo de Laguna (27), 

 and Monclova, Coahuila (44), and at Monterey, Nuevo Leon (47). A 

 low form with narrow entire leaves was collected at Parras (46) ; 17 

 Parry & Palmer. 



Syxthlipsis Beklandieri, Gray, var. hispida. More or less 

 villous, with little stellate pubescence, the ovary densely hairy, and the 

 pod more loosely so. — Near Corpus Christi Bay, Texas (26). This 

 is the same as 157 and 1417 Berlandier, from Laredo in Tamaulipas, 

 and appears to differ from the typical form only in the pubescence. 



Synthlipsis heterochroma. Piocumbent and much resembling 

 ordinary forms of S. Berlandieri, more or less canescent with stellate 



VOL. XVII. (n. S. IX.) 21 



