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4. P. inamoena Gray. Hirsute-pubescent with barbed hairs: leaves very thin, 
cordate at base, deeply 3-cleft, the lobes oval-oblong, subserrate, the terminal one 
narrowed at base, the lateral ones a little shorter and often 2-lobed or coarsely 2 or 3- 
toothed ; the petioles with 2 glands towards the apex: peduncles with 2 smal] seta- 
ceous bracts: flower greenish: fruit ovoid, 3.5 cm. in length.—A Mexican species, 
found by Nealley in Hidalgo County. 
5. P.tenuiloba Engelm. Slender and suberect: leaves rather rigid, with revolute 
margins, subscabrous above with short hairs, smoothish and reticulated beneath, bi- 
glandular at base, subcordate, 3-lobed: the lateral lobes lanceolate-linear, elongated, 
cuspidate, horizontally divergent or recurved; the middle lobe very short and entire 
in the lower leaves, shortiy 3-lobed in the upper: flowers greenish, 16 to 18 mm. in 
diameter, with no involucre: fruit small.—Very abundant between the Colorado and 
the lower Rio Grande and west to the Pecos. 
CUCURBITACEA. (GourD FAMILY.) 
Mostly succulent herbs with tendrils, alternate palmately lobed or 
veined leaves, diw@cious or moneecious (often gamopetalous) flowers, 
calyx-tube cohering with the 1 to 3-celled ovary, the 5 or usually 24 
stamens (i. ¢., 1 with a 1-celled and 2 with 2-celled anthers) commonly 
united by their often tortuous anthers and sometimes also by the fila- 
ments, and a fleshy fruit (known as a pepo) or sometimes membrana- 
ceous.—A large tropical order, represented in cultivation by such plants 
as the gourd, pumpkin, squash, muskmelon, cucumber, and watermelon. 
* Ovary 1-celled, with 3 to 5 placentic and numerous horizontal ovules, 
+ Anther-cells contorted or conduplicate. 
+ Corolla rotate or campanulate, 5-parted to the base or of 5 distinct pet als. 
1. Lagenaria. Calyx-tube of the sterile flower elongated: anthers cohering in an 
oblong head and mostly included in the calyx-tube: flowers monacious: petioles 2- 
glandular at apex. 
2, Cucumis. Calyx-tube of the sterile flower short: anthers distinet or but lightly 
cohering and mostly exserted; the connective produced beyond the cells: tendrils 
simple. 
3. Citrullus. Like the last, but the connective not produced and the tendrils 
mostly 2 or 3-forked. 
++ ++ Corolla campanulate, 5-lobed to the middle or a little below: anthers coherent. 
4. Cucurbita. Flowers monecious: filaments distinct, with staminodia inserted at 
the bottom of the calyx: stigmas 3 to 5 and 2-lobed. 
+ + Anther-cells straight or curved, not contorted. 
++ Style inserted on a cup-shaped disk or ring. 
5. Apodanthera. Calyx-tube subcylindrical: anthers distinct, sessile, dorsally 
fixed: stigma solitary, 3-lobed: ovary with 3 placentie: sterile flowers racemose. 
6. Melothria. Calyx-tube campanulate: anthers mostly straight and sessile, bas- 
ally fixed. 
w+ 4+ Disk at base of style none or obscure: stamens inserted in the throat of the 
calyx. 
7. Maximowiczia. Flowers dimcious: calyx-tube narrowly campanulate or cy- 
lindrical: stamens 3: stigma solitary, 3-lobed: ovary with 2 or 3 placentie: fruit 
globose. 
