ROSEANTHUS, A NEW GENUS OF CUCURBITACEE FROM 
ACAPULCO, MEXICO, 
By ALFRED CoOGNIAUX, Verviers, Belgium. 
Roseanthus Coen., ven. nov. 
Flores monoici! omnes axillares, solitarii. Masculirares, longe pedicellati. Calycis 
tubus longe tubulosus, angustus, superne leviter dilatatus; lobi 5, breviusculi, tri- 
angulari-lineares, Corolla anguste campanulata, usque ultra medium 5-fida, seg- 
mentis integris oblongis acutis. Stamina 38, supra medium tubi calycis inserta, 
filamentis liberis, elongatis, capillaribus; antherie in capitulum connatie, una uni- 
locularis caetere biloculares, loculis linearibus longitudinaliter triplicatis, connec- 
tivo angusto non producto. Pollen subsphiericum, subtiliter sparseque muriculatum. 
Pistillodium nullum, Flores feminei: Calyx supra ovarium et corolla maris. Stam- 
inodia nulla, Ovarium anguste ovoideum, 4-5-placentiferum, multilocellatum, locel- 
lis uniovulatis, ovulis horizontalibus; stylus capillaris, elongatus, disco basilari 
nullo, stigmatibus 3 elongatis profunde bifidis, lobis divaricatis. Fructus siccus, 
indehiscens, multilocellatus, locellis monospermis longitudinaliter 4—5-seriatis, peri- 
carpio tenui. Semina late ovata, hevia, valde complanata, marginibus subalatis 
integerrimis. 
Herb annuie, scandentes. Folia petiolata, membranacea. Cirrhi2-3-fidi.? Flores 
majusculi, albi. Fructus mediocris, globusus, hevis. 
This genus belongs to the series Plagiospermew. It is near Cucurbita, but differs 
in the color of the flowers, shape of calyx, insertion of stamens, and absence of 
staminodia. 
Perhaps, however, it should be placed by the side of Schizocarpum, from which it 
differs chiefly in its dicecious flowers, the absence of pistillodia, the three bifid 
stigmas, and the indehiscent fruit. 
I dedicate this new genus to Dr. J. N. Rose, the First Assistant Botanist of the 
United States Department of Agriculture,in Washington, who has recognized its 
characters and affinities, and to whom I am moreover indebted for specimens of 
various new Cucurbitacew and Melastomacex, 
'T have taken the liberty of changing Professor Cogniaux’s divici to monoici. The 
first set of plants grown contained one specimen which produced male flowers only, 
while all the others produced female flowers in abundance. It was a part of these 
plants that were sent to Professor Cogniaux. Since then I have grown two other 
plants, which for three or four weeks have been producing many female flowers 
but no male flowers. At length, however, male flowers have begun to appear.— 
J.N.R. 
? The tendrils have a curious habit when running over other plants (as for instance 
the tomato) of forming smali disks, by which they adhere. These disks not only 
occur at the end of the tendrils, but also at a considerable distance back from the 
tip.—J. N. R. 
577 
