298 PROCEEDINGS OF 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 em. 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, 24 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: e 
mature fruit not seen.— Collected by C. Conzatti, Oaxaca, altitude 1,500 i 
m., 0 January, 1896, no. 62. 
Streptotrachelus, nov. gen. of Apocynacee (Euechitidee). Calyx 
5-parted, naked at the base within. Corolla salverform, coronate, esqu* 
mate, tube cylindrical not dilated at the throat, soon becoming strongly j 
contorted at the middle; lobes 5, dextrorsely convolute in the bud, and A 
sinistrorsely twisted. Stamens affixed to the upper half of the corolla 
tube, included, free portion of the filament short ; anthers sagittate, 4 
acuminate, connivent about the stigma, the cells projecting below re! : 
two rigid appendages. Disk of 5 oblong fleshy persistent scales about a 
equalling the ovary. Ovary of two distinct carpels with a common 4 
form style; stigma fleshy, oblong-cylindrical, short-acuminate, somewhat | 
2-cleft at the apex, dilated at the base, adherent above and below to the 7 
anthers; ovules in each carpel numerous. Follicles subterete. Seeds | 
oblong-linear, furrowed, not contracted into a beak at the coma-be" © | 
apex; albumen scanty; cotyledons plane. Woody stemmed twin 
plants with opposite leaves and cymose inflorescence. The gen 
name is taken from orperrés, twisted, and tpdxyAos, throat, in referen® I 
to the twisting of the corolla-tube. q 
Streptotrachelus Pringlei. Stems woody, more or le 
with lenticels, twining and clambering over shrubs and small treest0* | 
6 meters ; branchlets reddish brown, puberulent: leaves opposite, pen 
$s covered : 
405 
