CACTUS FAMILY 417 
PASSIFLORA, L. 
In our species leaves lobed, alternate. Flowers axillary, single or in 
pairs on rather long flower stems. Petals greenish-yellow, longer than 
the sepals. Fruit a berry with many seeds, 
P. lutea, L. (Fig. 6, pl. 101.) Yrrtow Passion Frower, Vine, 3 to 
10 ft. long, trailing or climbing. Leaves much broader than long, 3-lobed. 
Flowers and tendrils from the axils. Flowers yellow. In southern part 
of our area. May-July. 
Order XII—OPUNTIALES. The Order of the Cacti 
An order of fleshy, generally spiny plants of which we have but 
a single species. Z'he ovary is inferior to the calyx and attached 
to it. The flowers are regular with an indefinite number of petals 
and stamens. ‘The stems are fleshy and the leaves often rudi- 
mentary. 
The Famity CACTACEAE is the only one of the order and in 
our North Eastern States we have only a single Genus. 
OPUNTIA, Mill. 
With its succulent branching stems and spiny leaves. Flowers upon 
the sides of the stem, with numerous petals. which are slightly united 
at base. Stamens also numerous, Fruit a pear-shaped spiny berry. 
O. vulgaris, Mill. (Fig. 7, pl. 101.) Eastern Prickty Pear. (0. 
Opuntia. (L.) Coult.) Is our only species, growing on rocks and in dry 
soil in the southern and eastern section of our region June-Aug. 
Order XIII—THYMELEALES. Moose Wood Order 
The species of this order are, in our area, all shrubs. The calyx 
extends upward upon the ovary, covering it and adhering to it. 
The flowers are without petals. The ovary has but a single ovule. 
For other characters, see those of the two Families. 
Wedves.ereen: <p. rw C&O go THY MELEACEAE 
Leaves silver-scurfy . . +. . . . ELAEAGNACEAE 
Famity IL—THYMELEACEAE. Moosr Woop FamiIty 
Our only native species a small shrub. Flowers without petals. 
Ovary with a single ovule. The inner bark is tough and fibrous, 
the leaves without lobes and with entire borders are alternate. 
Flowers with colored calyx, stamens and pistils, the calyx of 4 
sepals. Fruit a hard, dry, ovoid drupe. Another species, an 
