434 URTICACEJE. (NETTLE FAMILY.) 
Suborder II. CANNABINEiE. The Hemp Family. 
Herbs, with watery juice, mostly opposite stipuled leaves, and dioe¬ 
cious flowers, the sterile racemed or panicled. Styles 2. Seed ortho- 
tropous. Embryo curved, without albumen. 
2. Humulus. Fruit in a membranous strobile. Leaves 3-5-lobed. 
3. Cannabis. Fruit spiked-clustered. Leaves 5- 7-foliolate. 
Suborder III. URTICEjE. The Nettle Family proper. 
Herbs (except in the tropics), with watery juice. Flowers in 
spikes, heads, or panicles. Style single or none. Seed orthotropous, 
erect, with a straight embryo in fleshy albumen. 
* Sepals distinct. 
4. Urtica. Fertile flowers 2-4 sepalled; no rudimentary stamens. 
5. Pilea. Fertile flowers with 3 sepals and 3 hooded scales (rudi¬ 
mentary stamens) at their base. 
* * Sepals of the fertile flowers united in a 4-tootlied tube or cup. 
6. Boehmeria. Spikes or clusters naked. Stigma 1-sided. 
7. Parietaria. Clusters involucrate-bracted. Stigma sessile. 
Suborder I. MOREiE. The Mulberry Family. 
1. MOliUS, Tourn. Mulberry. 
Flowers monoecious or dioecious ; the two kinds in separate ax¬ 
illary catkin-like spikes. Calyx 4-parted, the sepals ovate. Sta¬ 
mens 4 : filaments elastically expanding. Ovary 2-celled, one of 
the cells smaller and disappearing: styles thread-form, stigmatic 
down the inside. Achenium ovate, compressed, covered by the 
succulent berry-like calyx, the whole fertile spike thus becoming 
a thickened oblong and juicy (edible) aggregate fruit. - • Trees 
with milky juice and rounded leaves; the sterile spikes rather 
slender. (Mopca, the ancient name.) 
1. 1*1. rilbra, L. (Red Mulberry.) Leaves heart-ovate, ser¬ 
rate, rough above , downy underneath , pointed (on young shoots often 
variously lobed) ; flowers frequently dioecious; fruit dark purple,-" 
Rich woods, W. New England to Ohio. May.— A small tree, ripen 
ing its sweetish blackberry-like fruit in July. 
2. ]*I. alba, L. (White Mulberry.) Leares obliquely heart 
ovate, acute, serrate, sometimes lobed, smooth and shining ; j ru ^ w 
ish. —Naturalized near houses, used for feeding silk-worms. 
M. nigra, L., the Black Mulberry, is also occasionally cultivate 
Brousonetia papyrifera, Vent., the Paper Mulberry of Japan? 
&c., is often cultivated as a shade tree. 
