298 PROCEEDINGS OP THE AMERICAN ACADEMY. 



much branched from a suffrutescent base, rather densely covered with a 

 spreading villous pubescence : involucre purple, glabrous : capsule pu- 

 bescent. — Collected by C. G. Pringle, Pedrigal (lava beds), Valley of 

 Mexico, altitude 2,300 m., 25 August, 1896, no. 6436. 



Mentzelia Conzattii. Stems whitish, covered with a thin scarious 

 bark, below glabrous, above pubescent : lower leaves subopposite, upper 

 alternate, simple, including the petioles 5 to 14 cm. long, 1^ to 3^ cm. 

 broad, oblong-lanceolate, acuminate, acute, finely dentate, gradually nar- 

 rowed at the entire base into a short petiole, scabrous above, tomentose 

 beneath, midrib somewhat depressed above, prominent beneath ; petioles 



4 to 12 mm. long : inflorescence cymose-paniculate : flowers large, about 



5 cm. in diameter, showy : calyx deeply 5-lobed ; tube turbinate, barbel- 

 late-pubescent ; lobes lance-ovate, acuminate, 12 mm. long, 4 mm. broad 

 at the base, pubescent : corolla pentapetalous ; petals ovate-oblong, short- 

 acuminate, a little narrowed at the base, 2^ cm. long, 1 to 1^ cm. broad, 

 yellow in the dried state : stamens disposed in phalanges opposite the 

 petals, the filaments of the 3 outer stamens of each phalanx somewhat 

 flattened, the others filiform : style single, filiform ; stigma terminal : 

 mature fruit not seen. — Collected by C. Conzatti, Oaxaca, altitude 1,500 

 m., 5 January, 1896, no. 62. 



Streptotrachelus, nov. gen. oi Apocynacece {EuecMtidea;) . Calyx 

 5-parted, naked at the base within. Corolla salverform, coronate, esqua- 

 mate, tube cylindrical not dilated at the throat, soon becoming strongly 

 contorted at the middle; lobes 5, dextrorsely convolute in the bud, and 

 sinistrorsely twisted. Stamens affixed to the upper half of the corolla- 

 tube, included, free portion of the filament short ; anthers sagittate, 

 acuminate, connivent about the stigma, the cells projecting below into 

 two rigid appendages. Disk of 5 oblong fleshy persistent scales about 

 equalling the ovary. Ovary of two distinct carjiels with a common fili- 

 form style ; stigma fleshy, oblong-cylindrical, short-acuminate, somewhat 

 2-cleft at the apex, dilated at the base, adherent above and below to the 

 anthers ; ovules in each carpel numerous. Follicles subterete. Seeds 

 oblong-linear, furrowed, not contracted into a beak at the coma-bearing 

 apex ; albumen scanty ; cotyledons plane. Woody stemmed twining 

 plants with opposite leaves and cymose inflorescence. The generic 

 name is taken from o-Tpe7rT09, twisted, and TpdxrjXo's, throat, in reference 

 to the twisting of the corolla-tube. 



Streptotrachelus Pringlei. Stems woody, more or less covered 

 with lenticels, twining and clambering over shrubs and small trees to 4 or 



6 meters ; brauchlets reddish brown, puberulent : leaves opposite, petio- 



