196 POPULAR FLORA. 



Flowers monopcious, 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, (Murus) Mulberrt 



Flowei's dioecious: the fertile ones collected in a close and round head which is flesiiy in 

 fruit. Stamens 4. Style 1. 

 Sterile flowers in spikes. Leaves round-ovate or heart-shaped, rough above, soft- 

 downy beneath, some of them palmateh' lobed, (BroussonHia) *Pai'ek-Mulberey. 

 Sterile flowers in racemes. Leaves oblong, smooth above, entire; branclilets spiny, 



{Madiira) *Osage-Orakge. 



in. XETTLE 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, {Urt'ica) 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, (P'llea) 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, (Bcehmeria) False-Nextle. 

 Stigma a httle tuft: flowers in axillary cymes or clusters, accompanied by 



leafy bracts, {Farieturia} 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 



Plaiie-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 Ion? ;airs. 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. occidentalis. 



