316 THE KINDS OF PLANTS 



5. CANNABIS. Hemp. 



Tall, strong, dioecious herbs with 5 to 7 leaflets: fertile flowers in clus- 

 ters, with 1 sepal surrounding the ovary, and 2 long, hairy stigmas: sterile 

 flowers in racemes or panicles, with 5 sepals and 5 drooping stamens. 



C. sativa, Linn. Hemp. Six to 10 ft., strong-smelling, blooming all 

 summer: leaflets lanceolate, large toothed. Old World; cultivated for fiber 

 and sometimes escaped in waste places. 



6. HtMULUS. Hop. 



Twining dioecious herbs of tall growth, with 5 sepals in the sterile 

 flowers, the stamens erect: fertile flowers with 1 sepal, 2 flowers under each 

 scale of a short, thin catkin which becomes a kind of cone or " hop." 



H. Lilpulus, Linn. Common hop.' Perennial, rough -hairy: leaves broad- 

 ovate, deeply 3-lobed (only rarely 5-7-lobed) : sterile flowers in panicles 

 2-6 in. long: pistillate catkin enlarging into a "hop" often 2 in. or more 

 long. A native plant, cultivated for hops and sometimes for ornament. 



H. Jap6nicU8, Sieb. & Zuec. Japanese hop. Fig. 107. Annual: leaves 

 not less than 5-lobed : fertile catkin not enlarging into a hop. Japan; much 

 cultivated for ornament. 



7. tRTICA. Nettle. 



Erect herbs with opposite simple leaves and stinging hairs, and mon- 

 oecious or dioecious flowers in racemes or dense clusters, the calyx of 4 

 separate sepals: stamens 4: stigma sessile: fruit an ovate flat akene. The 

 following are perennials with flowers in panicled spikes. 



U. gracilis, Ait. Common nettle. Two to G ft. : leaves ovate-lanceolate, 

 serrate, on long petioles. Common in low grounds. 



U. dibica, Linn. Not so tall: leaves ovate-cordate and deeply serrate, on 

 rather short petioles, downy underneath. Weed from Europe, very stinging. 



XI. AKISTOLOCHIACE^. 

 BiRTHWORT Family. Dutchman's Pipe Family. 



Low aeaulescent herbs, or tall twining vines : leaves basal or alter- 

 nate, without stipules, petiolate, roundish or kidney-shnped: flowers 

 regular or irregular, perfect: perianth-tube brown or dull, valvate in 

 bud, adherent to ovary: stamens 6-12, epigynous, and adherent to 

 base of the styles: ovary 6-celled, pistil 1. A small family of about 200 

 species, sparingly represented in this country. Many of the members 

 have aromatic or bitter-tonic properties. 



A. Low stemless herbs 1. Asariim 



aa. Leafy-stemmed herbs, or woody climbers 2. Aristolochia 



I. ASARUM. Wild Ginger. 



Perennial spreading herbs: leaves large, kidney-shaped, pubescent: 



