1	"Plants with flowers"	2
1	"Plants with mature fruits"	29
2	"Branches spiny, the spines mostly in pairs, replacing or derived from the mostly paired tendrils"	Momordica
2	"Branches not spiny or, if weakly so, the spines derived from petiole bases; tendrils solitary"	3
3	"Leaves compound, with distinct leaflets"	4
3	"Leaves simple although sometimes very deeply dissected"	5
4	"Petals up to 4 mm long"	Kedrostis
4	"Petals 6 mm or more long"	Momordica
5	"Petioles with a pair of lateral glands just below or immediately adjacent to the blade"	Lagenaria
5	"Petioles without glands or, if glandular, then the glands not as above of leaves absent"	6
6	"Petiole bases with a ciliate, stipule-like bract"	7
6	"Petiole bases without a ciliate bract"	8
7	"Thecae of anthers flexuous; ovules more than 2; petals at least 3.5 mm long"	Dactyliandra
7	"Thecae of anthers short, straight; ovules 2; petals 1.5-2 mm long"	Ctenolepis
8	"Leaves, at least the upper leaves, subsessile, their bases clasping the stems"	9
8	"Leaves distinctly petiolate, their bases not clasping the stems or leaves absent"	10
9	"Flowers subtended by a conspicuous, circular, basally cordate, stem-clasping bract; leaves unlobed or almost so"	Momordica
9	"Flowers no so subtended; leaves shallowly to deeply lobed"	Cephalopentandra
10	"Tendrils usually 3-5-branched, occasionally also some merely 2-branched"	11
10	"Tendrils all simple or 2-branched"	12
11	"Petals almost or quite free; staminate flowers in racemes"	Luffa
11	"Petals united into a distinct tube; staminate flowers solitary"	Cucurbita
12	"Incurved scales present near the base of the upper surface of 1-3 of the petals"	Momordica
12	"Incurve scales not present on any petals"	13
13	"Tendrils 2-branched, occasionally also some simple"	14
13	"Tendrils all simple or 2-branched"	18
14	"Thecae of anthers almost straight; stamens inserted on the mouth of the hypanthia; placentae and stigmas 2"	Kedrostis
14	"Thecae of anthers folded or contorted; stamens inserted in the throat of the hypanthia; placentae and stamens 3"	15
15	"Leaves deeply divided,, the lobes pinnately lobulate"	Citrullus
15	"Leaves unlobed, palmately lobed, or absent"	16
16	"Hypanthia cylindrical, 10-32 mm long in both staminate and pistillate flowers; anthers narrow with tightly folded thecae, united into oblong heads"	"Peponium {Peponium vogelii}"
16	"Hypanthia up to 8 mm long in staminate flowers and 4 mm long in pistillate flowers; anthers wide with laxly convoluted thecae, these free or united into globose heads"	17
17	"Petals distinctly united"	Coccinia
17	"Petals free"	Luffa
18	"Flowers with prominent basal discs, free from the hypanthia on the sides, obconic or subglobose in staminate flowers, ringlike around the base of the styles in pistillate flowers"	19
18	"Flowers without basal discs or the glandular area, if present, not as above, not distinct laterally from the hypanthia"	24
19	"Staminate and pistillate flowers or only staminate flowers present"	20
19	"Staminate flowers absent, only pistillate flowers present"	22
20	"Stamens 3, all with 2 thecae; ovaries more or less glabrous"	Zehneria
20	"Stamens 3, 2 with 2 thecae, 1 with only 1; ovaries tomentose or hispid"	21
21	"Anther thecae straight or merely apically incurved"	"Cucumella {Cucumella kelleri}"
21	"Anther thecae folded twice, sinuous"	Cucumis
22	"Ovaries papillose, tuberculate, or softly spiny"	Cucumis
22	"Ovaries smooth or obscurely ribbed, pubescent"	23
23	"Stems and petioles rather finely hispid or pubescent"	Cucumella
23	"Stems and petioles coarsely spreading-setulose"	Cucumis
24	"Leaves deeply divided , the lobes pinnately lobulate"	Citrullus
24	"Leaves unlobed, palmately lobed, or absent"	25
25	"Petals 12-20 mm long, free or almost so"	Euriandra
25	"Petals 1-7.5 mm long or, if longer, clearly united"	26
26	"Thecae convolute; petals clearly united"	Coccinia
26	"Thecae straight, short; petals united only at the base"	27
27	"Stamens 3, all with 2 thecae"	Zehneria
27	"Stamens 3, 2 with 2 thecae and 1 with only 1 or stamens 5, all with 1 theca each"	28
28	"Ovaries not developing cup-like bases"	Kedrostis
28	"Ovaries developing cuplike bases"	Corallocarpus
29	"Fruits 17-22 mm long, 1.5-3.5 mm wide, sessile in the axils of circular, deeply cordate, stem-clasping bracts; seeds 1, basal"	Momordica
29	"Fruits not as above"	30
30	"Mature fruits dry, brownish, fibrous, opening by apical lids"	Luffa
30	"Mature fruits fleshy or, if dry, not opening by apical lids"	31
31	"Surfaces of fruits with sparse to dense spins, tubercles, or pustules or with undulate, wing-like ridges"	32
31	"Surfaces of fruits smooth or almost so, fruits terete, bluntly angular, or ribbed in cross-section"	33
32	"Spines, tubercles, or pustules of fruits ending in a solitary hyaline setae or the hardened basal remnant thereof, the fruits otherwise glabrous or pubescent"	Cucumis
32	"Spines or tubercles of fruits not ending in solitary setae; fruits setulose or glabrous or with fleshy wings"	Momordica
33	"Seeds with rugose appendages at one or both ends, the seed coat obscurely sculptured or, if the seeds without appendages, the their faces distinctly sculptured"	Momordica
33	"Seeds not as above, smooth, fibrillose, verrucose, or pitted, without appendages and not sculptured on their faces"	34
34	"Mature fruits whitish, yellowish, brownish, or green or variegated with these colors, not red"	35
34	"Mature fruits red or orange-red, at least in part"	39
35	"Fruits about 1.3 cm long and 6 mm wide"	Cucumella
35	"Fruits at least 3.5 cm long and 20 mm wide"	36
36	"Seeds truncate and slightly 2-horned at one end, ornamented on the faces with 2 raised edges"	Lagenaria
36	"Seeds tapered or rounded at the ends, without facial ridges"	37
37	"Seeds less than 6 mm long or, if longer, lengths 2 or more times widths, smooth, not bordered"	Cucumis
37	"Seeds 6 mm long or longer, lengths up to 1.7 times widths, smooth or not, bordered or not"	38
38	"Seeds not bordered,, at least distally, 6-11 mm long"	Citrullus
38	"Seeds bordered all around, 8-21 mm long"	Cucurbita
39	"Seeds 2, plano-convex, 7.5-11 mm long; fruits subglobose, slightly oblate, 1-1.5 cm in diameter"	"Ctenolepis {Ctenolepis cerasiformis}"
39	"Seeds and fruits not in the above combination"	40
40	"Seeds pitted or verrucose or with angular margins, dark"	41
40	"Seeds smooth or at most slightly rugose white to reddish or brown"	42
41	"Seeds pitted with angular margins"	"Dactyliandra {Dactyliandra stefaninii}"
41	"Seeds verrucose, especially on the rather thick margins"	"Cephalopentandra {Cephalopentandra ecirrhosa}"
42	"Seeds compressed, faces flat or only slightly convex, usually less than 2.4 mm thick"	43
42	"Seeds swollen, subglobose, ovoid to pyriform, usually at least 2.5 mm think"	44
43	"Fruits up to 1.3 cm in diameter; seeds up to 4 mm long, smooth when dry"	Zehneria
43	"Fruits larger (not known for some species); seeds larger, fibrillose when dry"	Coccinia
44	"Fruits small, ovoid, often rostrate berries, circumscissile above the green, cuplike bases"	Corallocarpus
44	"Fruits not circumscissile, splitting longitudinally, irregularly, or not splitting"	45
45	"Seeds 3.5-6 mm long, smooth"	Kedrostis
45	"Seeds more than 6 mm long, smooth or fibrillose"	Eureiandra