196 
POPULAR FLORA. 
Flowers monoecious, both kinds in separate catkin-like spikes; the calyx, &c. in the fer¬ 
tile sort becoming fleshy and eatable, making a berried multiple fruit (248, 
Fig. 223). Stamens 4. Styles 2, { Morus ) Mulberry. 
Flowers dioecious: the fertile ones collected in a close and round head which is fleshy in 
fruit. Stamens 4. Style 1. 
Sterile flowers in spikes. Leaves round-ovate or heart-shaped, rough above, soft- 
downy beneath, some of them palmately lobed, {Brousson'etia) *Paper-Mulberry. 
Sterile flowers in racemes. Leaves oblong, smooth above, entire; branchlets spiny, 
{Macliira) * Osage-Orange. 
III. NETTLE Subfamily. Herbs (in this country), with opposite or alternate leaves, a tough 
fibrous bark, and a colorless juice. Flowers monoecious or dioecious, in spikes, racemes, &c., not in 
catkins. Stamens of the same number as the sepals. Ovary one-celled, and style or stigma only one; 
fruit an akene. 
Plants beset with stinging bristles. 
Leaves opposite : sepals 4 in both kinds of flowers: stigma a little tuft, ( Urfica) Nettle. 
Leaves alternate: sepals 5 in the sterile, 4 unequal or 2 in the fertile, flowers: stigma 
awl-shaped, {Laportea) Wood-Nettle. 
Plants destitute of stinging hairs, and 
Very smooth: leaves opposite: sepals 3 or 4, separate: stigma a tuft, {Pilea) Clearweed. 
Smooth or hairy: leaves often alternate: calyx in the fertile flowers a cup with a 
narrow mouth enclosing the ovary. 
Stigma long and thread-shaped: flower-clusters naked, in spikes, {Bcehm'eria) False-Nettle. 
Stigma a little tuft: flowers in axillary cymes or clusters, accompanied by 
leafy bracts, {Parietana) Pellitory. 
IV. HEMP Subfamily. Herbs, with dioecious flowers, a colorless juice, fibrous tough bark, and 
opposite, or sometimes alternate, palmately-lobed or compound roughish leaves. Sterile flowers in 
compound racemes or panicles, with 5 sepals and 5 stamens. Fertile flowers crowded, and with only 
one sepal, which embraces the ovary and akene: stigmas 2, long. 
Herb erect, annual: leaves of 5 to 7 lance-shaped toothed leaflets. Stamens drooping. 
Fertile flowers in spiked clusters, each with a narrow bract, ( Cannabis) Hemp. 
Herb twining: root perennial: leaves heart-shaped and lobed. Fertile flowers in short 
and scaly catkins, with broad and thin bracts, in fruit making a sort of 
membranaceous cone, {Eumulus) Hop. 
83. PLANE-TREE FAMILY. Order PLATANACEiE. 
This consists only of the genus 
Plane-Tree. Pldtanus. 
Flowers monoecious, in separate round catkin-like heads. No calyx nor corolla to either kind. 
Sterile flowers consisting of short stamens and club-shaped scales intermixed: fertile flowers, of little 
scales and ovaries, which become club-shaped akenes, covered below with long hairs. Style awl- 
shaped, simple. Trees, with colorless juice, alternate palmately-lobed leaves and sheathing stipules. 
Only one species in this country, viz.: — 
American P., Sycamore, or Buttonwood. A well-known tree by river-banks. P . ocddentalis . 
