MONOECIA.— TETRANDRIA. 351 



538. URTICA. Nettle. Urticetx. 



!. \j.pumila: leaves opposite, ovate acuminate, 3- 

 nerved, serrate ; inferior petiole^ as long as the 

 leaves ; flowers monoecious, triandrous, in co- 

 rymbed heads, shorter than the pc oles. 

 HAB. Wet places. Jul;. — Aug. ©. Stem suc- 

 culent, semitransparent ; leav. shining, 



:. U. urens: leaves opposite, elliptical, about 5-nerved, 

 acutely serrate ; spikes glomerate, by pairs. 

 HAB. Waste places. May. ®. Stem % ft: high '; 

 plant stinging. §. 



3. U . dioica : leaves opposite, cordate, ovate-lanceo- 



late, coarsely serrate ; flowers dioecious ; spikes 

 paniculate, clustered, by pairs, longer than the 

 petiole. 

 HAB. Roadsides, &c. May. U. Stem 2— 3 ft. 

 high, erect; fi. sm., green ; plant stinging. §. 



4. U. procera : leaves opposite, ovate-Ian eolate, ser- 



rate ; petioles ciliate ; flowers dioecious ; spikes 

 somewhat branched, clustered, by pairs, longer 

 than the petioles. 

 HAB. Shady banks. July— Aug. U. Stem 3— 4 

 ft. high ; leav. subacuminate. 



">. U.capitata: leaves alternate, cordate-ovate, acu- 

 minate, serrate, 3-nerved, twice as long as the 

 petiole ; clusters spiked ; spikes solitary, shorter 

 than the leaves, leafy at the summit : -tern naked. 

 HAB. Shady woods. June — July. U- Stem 4 — 

 5ft. high ; leav. scab., on the stem opposite, 



o. U. divaricata : leaves alternate, ovate, tcuminate. 

 rather smooth ; petioles long, cilia' ; panicles 

 axillary, solitary, much branched an- divaricate, 

 longer than the petiole ; stem stinging. 

 HAB. Damp rocky places. July — Aog. U . Stem 

 2 — 3 ft. high, branch. ; leav. not cortl'lc. 



7. U. canadensis: leaves cordate-ovate, acuminate- 

 serrate, hispid on both sides; panicles axillary, 

 generally by pairs, much branched and divaricate, 

 inferior ones sterile and longer tha. the petiole, 

 upper ones fertile, elongate, stem very hispid 

 stinging. 



