314 DICOTYLEDONOUS PLANTS. 



1. U. pumila Linn. : leaves opposite, ovate, acuminate, 3-nerved, 

 serrate ; lower petioles as long as the leaves ; flowers monoecious, tri- 

 androus, in clustered corymbs, shorter than the petioles. 



HAB. Wet grounds. Can. to Car. July. . Stem mostly 

 erect, 6 12 inches high, succulent, almost transparent. Leave* 

 shining. Rickwecd. 



2. U. wens Linn.: leaves opposite, elliptic, somewhat 5-nerved, 

 acutely serrate ; spike glomerate, by pairs ; flowers clustered. 



HAB. Cultivated grounds. Can. to Geor. June, July. . 

 Stem 12 20 inches high, hairy -hispid. Plant stinging. Intro- 

 duced. Slinging Nettle. 



3. U. dioica Linn. : leaves opposite, cordate, ovate-lanceolate, 

 coarsely serrate ; flowers dioecious ; spike paniculate, clustered, by 

 pairs, longer than the petiole. 



HAB. Waste places. Can. to Car. June Aug. If. Stem 

 23 feet high, erect, branching. Floicers small, green, in axil- 

 lary racemes which are in pairs. Stinging. 



Large Stinging Nettle. 



4. U. procera MM. : leaves opposite, ovate-lanceolate, serrate ; pe- 

 tioles fringed ; flowers dioecious ; spikes branching, clustered, by 

 pairs, longer than the petioles. 



HAB. Low grounds. N. Y. S. to Car. July, Aug. H. Stem 

 3 4 feet high, obtusely 4-angled. Flowers in compact approxi- 

 mate clusters. According to Mr. Elliott, the leaves of this 

 species are 'never cordate, and the spikes are uniformly longer 

 than the petioles, in which points it differs from the U. procera 

 of Pursh, which would seem to be a distinct species, probably 

 the next 



5. U. gracilis Linn. : stem hispid ; leaves opposite, ovate-lanceolate, 

 serrate, cordate at base ; flowers dioecious ; peduncles hispid ; clust- 

 ers in pairs, somewhat branched, about as long as the petiole^. U. 

 procera Pursh. ? 



HAB. Rocky places. Can. to Penn. Pursh. MM. N. to Arc. 

 Amer. July, Aug. If. Stem 23 feet high. 



Slender StaUied Nettle. 



C. U. capitata Linn. : leaves alternate, cordate-ovate, acuminate, ser- 

 rate, 3-nerved, twice as long as the petiole ; clusters spiked j spikes 

 solitary, shorter than the leaves, leafy at the summit ; stem naked. 

 HAB. Shady woods. Can. to Car. June. July, .it. Stem 

 4 5 feet high, scabrous, furrowed. Leaves scabrous, those on the 

 stem generally opposite. Clusters lateral and axillary. Re- 

 sembles U. dioica. 



7. U. dvoaricata Linn. : leaves alternate, ovate, acuminate, serrate, 

 rather smooth ; petioles long, ciliate ; panicles axillary, solitary, di- 

 varicately branched, longer than the petiole ; stem stinging. 



HAB. Damp rocky grounds. Can. to Car. July, Aug. If. 

 Stem 23 feet high, branched. Allied to .the next species, but 

 differs in the leaves being smooth and not cordate, the panicles 

 solitary and mixed with fertile flowers. 



