1	"Specimen has male flowers"	2
1	"Specimen has female flowers and/or fruits"	24
2	"Male flowers in panicles, rarely racemes; stamens 5, free, inserted on disc"	"Neoalsomitra {Neoalsomitra suberosa}"
2	"Male flowers not in panicles (rarely in dichotomous racemes appearing paniculate); stamens 3, free, coherent or fused, not inserted on disc"	3
3	"Corolla fringed with hair-like outgrowths"	Trichosanthes
3	"Corolla not fringed"	4
4	"Male flowers solitary, sometimes co-axillary with females"	5
4	"Male flowers in racemes, umbels or fascicles"	12
5	"Flower-scape bearing sessile bract; corolla with 1-3 scales at base inside"	Momordica
5	"Flower-scape lacking bract; corolla lacking basal scales"	6
6	"Corolla yellow"	7
6	"Corolla white"	11
7	"Anther locules straight or slightly curved; corolla less than 15 mm diam."	Austrobryonia
7	"Anther locules flexuose; corolla usually more than 15 mm diam."	8
8	"Anthers fused in globular head; locules contorted"	Cucurbita
8	"Anthers free; locules triplicate"	9
9	"Anthers three bilocular"	"Benincasa {Benincasa hispida}"
9	"Anthers two bilocular, one unilocular"	10
10	"Stamens lacking connective appendages"	Citrullus
10	"Stamens with connective appendages"	Cucumis
11	"Leaves with 2-5 depressed glands on lamina near insertion of petiole"	"Coccinia {Coccinia grandis}"
11	"Leaves with 2 raised glands at top of petiole"	"Lagenaria {Lagenaria siceraria}"
12	"Racemes or umbels on peduncles more than 2 cm long"	13
12	"Racemes on peduncles less than 2 cm long or flowers fascicled"	20
13	"Tendrils absent"	"Ecballium {Ecballium elaterium}"
13	"Tendrils present"	14
14	"Anther locules triplicate; tendrils 2-branched"	15
14	"Anthers locules straight, slightly curved or apically hooked; tendrils simple"	18
15	"Leaves trifoliolate"	Nothoalsomitra
15	"Leaves simple, often deeply lobed"	16
16	"Corolla yellow, more than 2 cm diam.; stamens free"	Luffa
16	"Corolla greenish, less than 2 cm diam.; stamens fused"	17
17	"Corolla 15-20 mm diam."	Sechium
17	"Corolla 4-6 mm diam."	"Sicyos {Sicyos australis}"
18	"Anther locules apically hooked"	Mullerargia
18	"Anther locules straight or slightly curved"	19
19	"Anthers two bilocular, one unilocular"	Cucumis
19	"Anthers all bilocular"	"Zehneria {Zehneria mucronata}"
20	"Stamens inserted at base of hypanthium; anthers cohering"	"Diplocyclos {Diplocyclos palmatus}"
20	"Stamens inserted on sides of hypanthium; anthers free"	21
21	"Anther locules triplicate"	Cucumis
21	"Anther locules straight or slightly curved"	22
22	"Flowers white"	"Neoachmandra {Neoachmandra cunninghamii}"
22	"Flowers yellow or greenish yellow"	23
23	"Hypanthium narrowly campanulate, as long or longer than corolla lobes"	"Cucumis {Cucumis argenteus}"
23	"Hypanthium broadly campanulate, shorter than the corolla lobes"	"Austrobryonia {Austrobryonia micrantha}"
24	"Female flowers in panicles, rarely in racemes or solitary (then associated with a male panicle); styles 3; fruit a truncate capsule; seeds winged"	"Neoalsomitra {Neoalsomitra suberosa}"
24	"Female flowers not in panicles; style 1; fruit various (if capsular then operculate or fleshy); seeds not winged"	25
25	"Female flowers solitary, sometimes co-axillary with males"	26
25	"Female flowers not solitary, in pedunculate heads or fascicles"	45
26	"Corolla fringed with hair-like outgrowths"	Trichosanthes
26	"Corolla not fringed, more or less entire"	27
27	"Tendrils absent"	"Ecballium {Ecballium elaterium}"
27	"Tendrils present"	28
28	"Corolla with 1-3 scales inside at base as well as 3 staminodes if present; flower-scape usually with sessile bract"	Momordica
28	"Corolla lacking basal scales; flower-scape lacking bract"	29
29	"Corolla more than 25 mm diam."	30
29	"Corolla less than 25 mm diam."	35
30	"Fruit fibrous, dehiscing by opercula"	Luffa
30	"Fruit not fibrous, more or less fleshy, not operculate"	31
31	"Corolla white"	32
31	"Corolla yellow"	33
32	"Fruit less than 6 cm diam., red; tendrils simple"	"Coccinia {Coccinia grandis}"
32	"Fruit more than 10 cm diam., green; tendrils branched"	"Lagenaria {Lagenaria siceraria}"
33	"Disc present"	"Benincasa {Benincasa hispida}"
33	"Disc absent"	34
34	"Pedicels slender, less than 4mm diam."	Citrullus
34	"Pedicels thick, more than 8mm diam."	Cucurbita
35	"Leaves trifoliolate"	Nothoalsomitra
35	"Leaves simple, mostly lobed"	36
36	"Fruit more than 5 cm diam."	37
36	"Fruit less than 5 cm diam."	39
37	"Fruit pyriform, with 1 large seed"	Sechium
37	"Fruit globose or ellipsoidal, many-seeded"	38
38	"Fruit not spinose; seeds ovate, more than 8 mm long"	Citrullus
38	"Fruit spinose; seeds elliptic, less than 8 mm long"	Cucumis
39	"Fruit spinose with soft or rigid spines"	40
39	"Fruit not spinose"	41
40	"Seeds elliptic, smooth"	Cucumis
40	"Seeds ovate, attenuate, minutely pitted"	Mullerargia
41	"Fruit ellipsoidal or subglobose (if subglobose then ripening red)"	42
41	"Fruit subglobose, yellow when ripe"	44
42	"Seeds elliptic, not distinctly margined"	Cucumis
42	"Seeds ovate, margin distinct or thickened"	43
43	"Seeds pitted"	Cucumis
43	"Seeds smooth"	Austrobryonia
44	"Plants mostly monoecious; male flowers mostly in 4-8-flowered fascicles or on a peduncle <10 mm long; fruit globose, 8-12 mm diam."	"Neoachmandra {Neoachmandra cunninghamii}"
44	"Plants mostly dioecious; male flowers in 10-30-flowered umbels on a peduncle 20-70 mm long; fruit ellipsoidal, 9-15 mm long x 6-9 mm diam."	"Zehneria {Zehneria mucronata}"
45	"Inflorescence a pedunculate head; fruit bearing barbed spines, 1-seeded"	"Sicyos {Sicyos australis}"
45	"Inflorescence fasciculate; fruit not spinose, seeds few to many"	46
46	"Tendrils 2-branched"	"Diplocyclos {Diplocyclos palmatus}"
46	"Tendrils simple"	47
47	"Fruit subglobose; fruiting pedicels 2-3 cm long"	"Neoachmandra {Neoachmandra cunninghamii}"
47	"Fruit ellipsoidal or subglobose (if subglobose then fruiting pedicel less than 1 cm long)"	48
48	"Ovary hispid"	"Cucumis {Cucumis argenteus}"
48	"Ovary glabrous"	49
49	"Plants monoecious"	"Austrobryonia {Austrobryonia micrantha}"
49	"Plants dioecious"	"Zehneria {Zehneria mucronata}"