Abstract
1. The chromosome numbers of 12 species of the Cucurbitaceae have been determined from pollen mother cell material. The results may be summarized as follows: Melothria punctata, n = 12; Melothria abyssinica, n = 12; Momordica balsamina, n = 11; Luffa cylindrica, n = 13; Ecballium elaterium, n = 12; Citrullus colocynthis, n = 11; Cucumis myriocarpus, n = 12; Cucumis melo var. Golden Beauty, n = 12; Benincasa cerifera, n = 12; Cucurbita melanosperma, n = 20; Cucurbita pepo var. Orange gourd, n = 20; Cyclanthera pedata, n = 16. 2. The results of an experimental study of the fertility relations involving 4 genera and 8 species of the Cucurbitaceae indicate that species crossing is comparatively rare and not at all in accord with popular beliefs. Three species crosses were obtained: (1) between Cucurbita moschata and C. maxima; (2) between Cucurbita pepo and C. moschata; and (3) between Citrullus vulgaris and C. colocynthis. 3. The technique of making controlled pollinations among members of this family has be...
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