Family URTICACEA 101 
2. Humulus. 341. 
1. Humulus lupulus L. Hops. 
In woods and thickets throughout the state. Brunswick; Gage 
county; Holt county; Hooker county; Lincoln; Sioux county; Wahoo. 
3. Cannabis. 341. 
1. Cannabis sativa L. Hemp. 
Sometimes escapes from cultivation. Crete; Lincoln; Long Pine; 
Red Cloud; Rushville. 
5. URTICACEZ. 
Nettle Family. 
Leaves at least some of them opposite. 
Plants with stinging hairs. 1. Urtica. 
Plants without stinging hairs. 
Calyx of pistillate flowers of 3 sepals; achene 1 mm. long. 
3. Pilea. 
Calyx of pistillate flowers tubular, 2—4 toothed; achene nearly 
2 mm. long. 4. Boehmeria. 
Leaves all alternate. 
Leaves sharply serrate; flowers in loose axillary cymes, not in- 
volucrate. 2. Urticastrum. 
Leaves entire; flowers glomerate, involucrate. 5. Parietaria. 
1. Urtica. 342. 
Leaves ovate, cordate; plant very bristly. i. U..dioiea: 
Leaves lanceolate, rarely cordate; plant sparingly bristly. 
2. U. gracilis. 
1. Urtica dioica L. Stinging Nettle. 
Reported from Weeping Water. 
2. Urtica gracilis Ait. Slender Nettle. 
Throughout the state, common in woods and thickets. Keyapaha 
county; Lincoln; Mullen; Plummer Ford; Red Cloud; Republican 
City; Walton. 
2. Urticastrum. 342. 
1. Urticastrum divaricatum (L.) Kuntze. Wood Nettle. 
Common in woods in the eastern part of the state. Endicott; Lin- 
coln; Neligh; Saltillo; Valentine. 
3. Pilea. 343. 
1. Pilea pumila (L.) Gray. Clear-weed. 
In wet, shady places in the eastern part of the state. Burwell; En- 
dicott; Fremont; Gage county; Lincoln; Long Pine; Mullen. 
4. Boehmeria. 343. 
1. Boehmeria cylindrica (L.) Willd. False Nettle. 
In wet, shady places throughout the state, except the extreme west- 
ae part. Boelus; Callaway; Kearney; Natick; Pishelville; Sargent; 
imeon. 
