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Key to Cucurbita

Cucurbitaceae

Cucurbita

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1
Leaf blades distinctly longer than broad, triangular, usually unlobed; [coyote melon]
 ⇒ Cucurbita foetidissima

(c) Dove, Oscar - CC-BY
1
Leaf blades as wide or wider than long, deeply to shallowly lobed.
  2
Corolla cream; [FL peninsula]
 ⇒ Cucurbita okeechobeensis
  2
Corolla bright yellow, golden yellow, or orange; [collectively widespread, at least as waifs].
    3
Stems and leaves variously pubescent, the hairs generally not pustulate-based.
      4
Fruiting peduncles relatively soft and corky-thickened, terete and not strongly ribbed, expanding gradually along their length
 ⇒ Cucurbita maxima
      4
Fruiting peduncles hardened and woody, 5-ribbed, abruptly and widely expanded at point of fruit attachment
 ⇒ Cucurbita moschata
    3
Stems and leaves hispid with pustulate-based hairs.
      5
Wild plants; fruit almost always bitter, solid ivory or green-and-white striped, usually not yellow or orange; rind smooth.
        6
Fruit usually solid ivory, sometimes green-and-white striped; germination within 1-4 days
 ⇒ Cucurbita melopepo var. ozarkana
        6
Fruit usually green-and-white striped, sometimes maturing yellow; germination within 3-7 days
 ⇒ Cucurbita melopepo var. texana
      5
Cultivated plants (or occurring as waifs and short-term naturalized population, usually in proximity to cultivation); fruit non-bitter (except for some ornamental gourds), variously colored, often at least partially yellow or orange; rind smooth, ribbed, or with warts.
        7
[scallop, pattypan, acorn, crookneck, and straightneck squashes, most ornamental gourds]
 ⇒ Cucurbita melopepo var. melopepo
        7
[cocozelle, jack-o’-lantern pumpkins, vegetable marrows, zucchini, some ornamental gourds]
 ⇒ Cucurbita pepo