164 KEY AND FLORA 
PASSIFLORA L. 
Characters of the family. 
1. P. incarnata L. Passion Frower. Perennial. Stem often 
20-30 ft. long, somewhat angled or striate, smooth below, down 
above. Leaves broadly heart-shaped, palmately 3-5-lobed; the lobes 
acute, finely serrate, usually heart-shaped at the base; petiole bear- 
ing 2 oval glands near its summit. Flowers 2-3 in. wide, solitary; 
peduncles 3-bracted, longer than the petioles; calyx lobes with a 
small horn-like appendage on the back near the apex, white within. 
Petals and crown purple and white. Fruit yellow, about the size and 
shape of a hen’s egg, edible. Seeds with a pulpy aril. Common along 
fence rows and embankments S.* : 
2. P. lutea L. YeExttow Passion Frower. Perennial. Stem 
slender, smooth, 6-10 ft. long. Leaves broadly heart-shaped, 3-lobed 
at the summit, entire, often mucronate; stipules small; petioles 
without glands. Peduncles longer than the leaves, usually in pairs. 
Flowers greenish-yellow, 4-3 in. wide. Fruit purple, oval, 4 in. long. 
Woods and thickets S.* 
69. BEGONIACEZ. Brconia Famity 
Chiefly perennial herbs or low shrubs, with fleshy or very 
juicy stems. Leaves alternate, generally heart-shaped at the 
base, often very unsymmetrical; stipules deciduous. Flowers 
moneecious, in cymes or other clusters, on axillary peduncles. 
Stamens many (Fig. 25). Pistillate flowers with the floral 
envelopes borne on the ovary. Ovary 3-angled or 3-winged 
(Fig. 25), very many-seeded. 
BEGONIA L. 
Flowers with the calyx and corolla of the same color, stami- 
nate and pistillate ones both occurring in the same cluster. 
Sepals usually 2. Petals 2 or in the fertile flowers 8 or 4, 
sometimes wanting. Stamens many in a cluster, with short 
filaments. Styles of the fertile flowers 3, often with long, 
twisted stigmas (Fig. 25, C). The genus contains a great 
number of species and varieties, cultivated from tropical or 
subtropical regions, of which’ only a few of the commonest 
are here described. 
