1 | Corolla segments fimbriate at margin | (2) |
+ | Corolla segments not fimbriate | (3) |
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2(1) | Ovules and seeds numerous; calyx tube less than 7 cm. | 21 Trichosanthes 栝楼属 |
+ | Ovules 12, seeds usually 6, each with 1 abortive seed attached to its side; calyx tube 7-10 cm. | 20 Hodgsonia 油渣果属 |
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3(1) | Stamens 5, anther cells ovoid and straight | (4) |
+ | Stamens 3 or 1, anther cells horizontal when only 1 stamen, or rarely 5 but then anther cells conduplicate | (15) |
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4(3) | Leaves palmately compound, rarely simple | (5) |
+ | Leaves simple | (9) |
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5(4) | Plants woody, scandent; leaflets almost entire, with 2 glands at base; seeds with membranous wing at apex. | 4 Neoalsomitra 棒锤瓜属 |
+ | Plants herbaceous, scandent; leaflets distinctly denticulate, eglandular at base; seeds without wing or rarely winged | (6) |
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6(5) | Fruit indehiscent; seeds horizontal. | 11 Thladiantha 赤瓟属 |
+ | Fruit 3-valved, dehiscent at apex or rarely not dehiscent but then smaller in size; seeds pendulous | (7) |
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7(6) | Corolla segments more than 5 mm; fruit clavate-cylindric, obovoid, or globose, more than 6-seeded. | 1 Hemsleya 雪胆属 |
+ | Corolla segments less than 3 mm; fruit turbinate or globose, 1-3(-5)-seeded | (8) |
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8(7) | Plants monoecious; fruit turbinate, 3-valved, dehiscent at apex. | 2 Gomphogyne 锥形果属 |
+ | Plants dioecious; fruit globose or campanulate, indehiscent or dehiscent along ventral suture. | 3 Gynostemma 绞股蓝属 |
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9(4) | Flowers with corolla segments less than 10 mm; fruit dehiscent, operculate or 3-valved | (10) |
+ | Flowers with corolla segments ca. 2 cm, or if smaller then calyx longer than corolla; fruit baccate, indehiscent; seed not winged | (12) |
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10(9) | Leaf blade entire; fruit 6-10 cm, truncate at apex, 3-valved; seeds surrounded by a membranous wing. | 5 Zanonia 翅子瓜属 |
+ | Leaf blade divided; fruit 1-3.5 cm, operculate; seed not winged or with membranous wing at apex | (11) |
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11(10) | Plants monoecious; leaf blade cordate-hastate, eglandular at base; fruit dehiscent near middle; seeds not winged. | 7 Actinostemma 盒子草属 |
+ | Plants dioecious; leaf blade with 1 or 2 pairs of glands at base; fruit dehiscent near apex; seeds with membranous wing at apex. | 6 Bolbostemma 假贝母属 |
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12(9) | Flowers with calyx longer than corolla; anthers reniform; fruit more than 10 cm. | 8 Indofevillea 藏瓜属 |
+ | Flowers with corolla longer than calyx; anthers oblong; fruit less than 10 cm | (13) |
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13(12) | Plants with black glandular scales. | 9 Siraitia 罗汉果属 |
+ | Plants without glandular scales | (14) |
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14(13) | Tendrils spiraling only above point of branching; anther cells straight. | 11 Thladiantha 赤瓟属 |
+ | Tendrils spiraling also below point of branching; anther cells reniform-curved. | 10 Sinobaijiania 白兼果属 |
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15(3) | Stamens united into a central column and pollen sac fusing into ring; leaf blade pedatipartite. | 22 Cyclanthera 小雀瓜属 |
+ | Stamens 3, or rarely 5 but then anther cells conduplicate; leaves not pedately compound | (16) |
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16(15) | Flowers less than 10 mm in diam | (17) |
+ | Flowers more than 10 mm in diam | (24) |
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17(16) | Plants dioecious or rarely flowers bisexual; fruit 3-valved from apex to base when mature; seeds 1-3, pendulous. | 14 Schizopepon 裂瓜属 |
+ | Plants usually monoecious, rarely dioecious; fruit indehiscent; seeds often horizontal | (18) |
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18(17) | Male flowers without pistillode; anther cells conduplicate; male and female flowers fasciculate in leaf axil. | 29 Diplocyclos 毒瓜属 |
+ | Male flowers with globose or subulate pistillode; anther cells straight, curved or conduplicate | (19) |
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19(18) | Anther cells incurved or reflexed. | 33 Solena 茅瓜属 |
+ | Anther cells straight | (20) |
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20(19) | Male flowers in sessile or subsessile fascicles; ovary hispid. | 27 Mukia 帽儿瓜属 |
+ | Male flowers in pedunculate cymes, racemes, or umbels, or solitary; ovary glabrous or with fine hairs | (21) |
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21(20) | Filaments as long as or longer than anthers, ca. 1 mm or more | (22) |
+ | Filaments shorter than anthers, 0.5-1 mm | (23) |
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22(21) | Corolla yellow; filaments and staminodes glabrous except at very base; seeds scrobiculate. | 28 Scopellaria 云南马(瓜交)儿属 |
+ | Corolla white or pale yellow; filaments and staminodes hairy above base; seeds smooth. | 25 Zehneria 马(瓜交)儿属 |
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23(21) | Anther connective not produced beyond thecae; stigmas glabrous, apically shortly 2-lobed; fruit black when ripe. | 24 Melothria 美洲马(瓜交)儿属 |
+ | Anther connective usually shortly produced beyond thecae; stigmas papillose, rounded; fruit white or red when ripe. | 25 Zehneria 马(瓜交)儿属 |
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24(16) | Anther cells straight; calyx tube narrowly funnelform. | 17 Edgaria 三棱瓜属 |
+ | Anther cells conduplicate | (25) |
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25(24) | Tendrils absent. | 13 Ecballium 喷瓜属 |
+ | Tendrils present | (26) |
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26(25) | Corolla campanulate | (27) |
+ | Corolla rotate or rarely campanulate but then segments almost free | (28) |
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27(26) | Leaf blade hirsute, eglandular at base; flowers yellow; fruit large. | 35 Cucurbita 南瓜属 |
+ | Leaf blade glabrous, with a few glands at base; flowers white; fruit ca. 5 cm. | 30 Coccinia 红瓜属 |
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28(26) | Calyx tube in male flower elongate, tubular or funnelform | (29) |
+ | Calyx rotate | (32) |
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29(28) | Flowers white; petiole apex 2-glandular. | 31 Lagenaria 葫芦属 |
+ | Flowers yellow; leaf blade eglandular at base | (30) |
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30(29) | Corolla rotate; leaf blade less than 10 cm. | 19 Gymnopetalum 金瓜属 |
+ | Corolla campanulate; leaf blade over 10 cm | (31) |
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31(30) | Leaf blade deeply lobed; seeds many, horizontal. | 15 Biswarea 三裂瓜属 |
+ | Leaf blade undivided; seeds few, pendulous. | 16 Herpetospermum 波棱瓜属 |
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32(28) | Flowers with leaflike bract on pedicel; fruit usually muriculate, often 3-valved when mature. | 12 Momordica 苦瓜属 |
+ | Flowers without bract on pedicel | (33) |
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33(32) | Male inflorescence racemose or subumbellate | (34) |
+ | Flowers solitary or fascicled | (35) |
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34(33) | Annual herb; fruit many seeded. | 18 Luffa 丝瓜属 |
+ | Perennial climber; fruit 1-seeded; seed large. | 23 Sechium 佛手瓜属 |
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35(33) | Calyx segments subleaflike, dentate, reflexed. | 34 Benincasa 冬瓜属 |
+ | Calyx segments subulate, entire, not reflexed | (36) |
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36(35) | Tendrils 2- or 3-fid; connective not produced. | 32 Citrullus 西瓜属 |
+ | Tendrils simple; connective produced beyond anther cells. | 26 Cucumis 黄瓜属 |
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