OF ARTS AND SCIENCES. 115 



Mr.TASTELMA Califoknicum, Benth. In the Caracol Mountains, 

 Coahuila (828), and near San Luis Potosi (62o Seliaffner, in part). 



Metastelma Palmeri. Twining, glabrous or with a pilose line 

 upon the stem above : leaves linear-lanceolate, acuminate, cuneate or 

 sometimes rounded at base, shortly petinlate, ^ to 1 inch long : 

 corymbs nearly sessile, 3-10-flowered, glabrous ; pedicels a line long 

 or less : calyx-lobes acutish ; corolla thick, white or brownish exter- 

 nally, over a line long, open-campanulate, the oblong lobes acutish, 

 pubescent within: crown of five distinct thickish acuminate-subulate 

 scales, exceedini; the flat stigrma: follicles l.V inches Ion<j. — At Laredo 

 on the Rio Grande (824), and about San Luis Potosi (G25 Schaffner, 

 in part) ; collected also at Chiapas (GG4 Ghiesbreght), and in the 

 valley of Mexico (027 Bourgeau). 



Vincetoxicuji Mexicanum. Stems herbaceous, slender, twining, 

 2 or 3 feet long, with a hairy line on one side : leaves linear to linear- 

 lanceolate, acuminate, cuneate or slightly rounded at base, ^ to 1^ 

 .inches long, glabrous or sparingly pubescent, or puberulent beneath : 

 corymbs somewhat pubescent, sessile or nearly so, 1-10-flowered ; 

 pedicels a line long or less : calyx-lobes obtusish ; corolla white, § of 

 a line long, open-campanulate, the rather broad lobes obtusish, gla- 

 brous : crown of five thin ovate-oblong obtusish scales, distinct or 

 nearly so, somewhat exceeding the flat stigma : follicles 2 to 2^ inches 

 long. — In the Sierra Madre, south of Saltillo (823), and near San 

 Luis Potosi (G52 Schaffner, in part) ; 575 Parry & Palmer; Orizaba 

 (342 and 984 Botteri). This may be the same as Metastelma angusti- 

 foliwn, Turcz. 



RouLiNiA unifaria, Engelm. At San Antonio, Texas (827). 



RouLiNiA Palmeri. With the habit, foliage, pubescence and 

 fruit of the last : peduncle shorter than the petiole, the corymbose 

 raceme 3-G-flowered ; pedicels unequal, 3 to 6 lines long : flowers 

 larger, the linear calyx-lobes 1 1 to 2 lines long ; corolla 2 lines long, 

 with a short tube, the greenish lobes whiter and somewhat thickened 

 above: coronal scales united at base, quadrate, about ecjualling the 

 stigma, obtusely 3-lobed at the summit, or the middle lobe longer and 

 triangular-cuspidate. — In the mountains north of Monclova, Coa- 

 huila (829). Referred by Hemsley to the last, from which it differs 

 chiefly in the characters of the flowers. 



GoNOLOBus PARViFLORUS, Gray. At Laredo on the Rio Grande 

 (820). 



GoNOLOBUs RETTCULATus, Engelm. At San Antonio, Texas 

 (825), and at Soledad, Coahuila (826). 



