This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Climbing tendril-bearing herbaceous or woody vines, with lobed parted or entire alternate or rarely opposite leaves, and large showy axillary flowers, on jointed, often bracted peduncles. Calyx-tube cup-shaped or campanulate, deeply 4-5-lobed, the lobes narrow, imbricated in the bud, its throat crowned with a double or triple fringe called the corona. Petals 4 or 5 (rarely none), inserted on the throat of the calyx. Ovary oblong, stalked. Filaments monadelphous in a tube around the stalk of the ovary, separate above; anthers narrow, versatile. Fruit a many-seeded berry. Seeds pulpy-arilled, flat, ovate; endosperm fleshy. [Flower of the Cross, or Passion, as emblematic of the crucifixion.]
About 300 species, mostly natives of tropical America, a few in Asia and Australia. Besides the following, about 7 others occur in the southern and southwestern States. Type species: Passi-flora incarnata L.
Leaves deeply 3-5-lobed; the lobes serrate; petals whitish; corona purple.
Leaves obtusely 3-lobed above the middle, the lobes entire; flowers yellowish.
Passiflora incarnata L. Sp. Pl. 959. 1753.
Stem glabrous, or slightly pubescent above, striate when dry, climbing to a height of 10°-30°. Petioles Ĩ-2' long, with 2 glands near the summit; leaves nearly orbicular in outline, glabrous, or often somewhat pubescent, 3'-5' broad, somewhat cordate at the base, deeply 3-lobed (rarely 5-lobed),the lobes ovate or oval, acute or acutish, finely serrate; flowers solitary, axillary, white with a purple or pink corona, 1 1/2'-2' broad; peduncles longer than the petioles, usually 3-bracted just below the flowers; calyx-lobes linear, cuspidate on the back; berry ovoid, nearly 2' long, glabrous, yellow.
Passiflora lutea L. Sp. PI. 958. 1753. ' Glabrous or very nearly so throughout, herbaceous, climbing or trailing, 3°-10° long. Petioles 1/2'-1 1/2' long; leaves much broader than long, more or less cordate at base, with 3 wide obtuse rounded lobes, the lobes entire, often mucronulate; stipules \"-\\" long; peduncles slender, exceeding the petioles, usually in pairs from the upper axils; flowers greenish yellow, 6"-10" broad; calyx-lobes linear; berry globose-ovoid, 5"-6" in diameter, glabrous, deep purple.
In thickets, Pennsylvania to Illinois, Missouri, Kansas, Florida and Texas. May-July.