196 URTICACEAE 
a single plant or the two kinds on different plants. Stamens 3 or 4; 
calyx 3- or 4-parted; pistillate calyx 3-parted. Leaves ovate, pointed at 
each end, 3 nerved. 
P. pumila, (L.) Gray. (Fig. 7, pl. 31.) CLEARWEED. RICHWEED. 
Succulent, half transparent stems 3 in. to 2 ft. high. Leaves egg-shaped, 
coarsely and deeply toothed, pointed at base or apex. Flower clusters, 
two in axil of a leaf, much shorter than leaf stalk. Moist places; fre- 
quent. 
¥ 
4. BOEHMERIA, Jacq. 
Flowers of both kinds or only of one kind on a single plant, collected 
in spikes of globular clusters, or, the lower spikes non-continuous. Leaves 
opposite, 3 nerved. Staminate flowers, stamens 4. Calyx generally 
4-parted; calyx of pistillate flowers tubular or 4-toothed. 
B. cylindrica, (L.) Sw. (Fig. 10, pl. 31.) Witp Fatse Nettie. A 
coarse weed in low places, 2 to 3 ft. high. Leaves ovate, opposite on 
long leaf stalks, coarsely dentate. Flower spikes from leaf axils, the 
upper spikes leafy at top. Moist places; frequent. 
5. PARIETARIA, L. 
Herbs with alternate 3-nerved leaves, with dense axillary clusters of 
greenish flowers, Staminate and pistillate in the same groups, surrounded 
by leafy bracts; stamens 4; calyx of both kinds of flowers 4-parted. 
P. pennsylvanica, Muhl. (Fig. 5, pl. 31.) PENNSYLVANIA PARIE- 
TARIA. Stem weak, delicate, leaves broadly lanceolate, 3-nerved, without 
indentations, tapering at each end, apex rather blunt; flowers in a rounded 
group. In dry shady places. 
6. HUMULUS, L. 
A twining vine, often 25 ft. or more in length. Leaves opposite, 3 or 
more lobed, rough; staminate flowers in loose branching clusters, yellow- 
ish-green; pistillate flowers in catkin-like, rounded or elongated clusters 
of yellowish-green bracts inclosing each a single ovary. 
H. Lupulus, L. (Fig. 1, pl. 31.) Hor. Extensively cultivated, but 
found wild in thickets and along streams. 
7. CANNABIS, Tourn. 
Erect herb with opposite leaves divided in long finger-like lobes. 
Stipules persistent; clusters of greenish flowers axillary; the staminate 
in loose branching clusters, the pistillate in spikes; pistillate flowers, 
each surounded by a leafy bract. 
C. sativa, L. (Figs. 2 and 3, pl. 31.) Hemp. Very erect herb, 3 to 
6 ft. tall, branching; the leaves consisting of from 5 to 7 long leaflets 
joined at the base. In waste places, and cultivated for its fibers. 
Order II.—SANTALES 
This small order, containing two families, each with very few 
species, includes plants which are parasitic or half parasitic. Be- 
yond this there are few common characteristics between the two 
