1. P. lùtea, L. Smooth, slender; leaves obtusely 3-lobed at the summit, the lobes entire; petioles glandless; flowers greenish-yellow (1´ broad); fruit ½´ in diameter.—Damp thickets, S. Penn. to Fla., west to Ill., Mo., and La.
2. P. incarnàta, L. Pubescent; leaves 3–5-cleft, the lobes serrate, the base bearing 2 glands; flower large (2´ broad), nearly white, with a triple purple and flesh-colored crown; involucre 3-leaved; fruit as large as a hen's egg.—Dry soil, Va. to Fla., west to Mo. and Ark. Fruit called maypops.
Order 45. CUCURBITÀCEÆ. (Gourd Family.)
Mostly succulent herbs with tendrils, diœcious or monœcious (often gamopetalous) flowers, the calyx-tube cohering with the 1–3-celled ovary, and the 5 or usually 2½ stamens (i.e., 1 with a 1-celled and 2 with 2-celled anthers) commonly united by their often tortuous anthers, and sometimes also by the filaments. Fruit (pepo) fleshy, or sometimes membranaceous.—Limb of the calyx and corolla usually more or less combined. Stigmas 2 or 3. Seeds large, usually flat, anatropous, with no albumen. Cotyledons leaf-like. Leaves alternate, palmately lobed or veined.—Mostly a tropical or subtropical order; represented in cultivation by the Gourd (Lagenària vulgàris), Pumpkin and Squash (species of Cucurbita), Muskmelon (Cùcumis Mèlo), Cucumber (C. satìvus), and Watermelon (Citrúllus vulgàris).
[*] Fruit prickly. Seeds few, erect or pendulous. Flowers white. Annual.
[+] Ovary 1-celled. Seed solitary, pendulous.
1. Sicyos. Corolla of the sterile flowers flat and spreading, 5-lobed. Fruit indehiscent.
[+][+] Ovary 2–3-celled. Seeds few, erect or ascending.
2. Echinocystis. Corolla of the sterile flowers flat and spreading, 6-parted. Anthers 3. Fruit bladdery, 2-celled, 4-seeded, bursting at the top.
3. Cyclanthera. Corolla 5-parted. Anther 1, annular. Fruit oblique and gibbous.