URTICE^E. 313 



HAB. Waste grounds. Can. to Vir. July, Aug. It. Stem 

 12 18 inches high, branched at the top, simple below. 



10. E.mercurialina Muhl, : stem weak and slender, simply 3-cleft; 

 leaves opposite and ternate, subsessile, oval, entire ; peduncles termi- 

 nal, solitary, 1 -flowered. 



HAB. Shady rocky situations. Penn. Pursh. July, Aug. 1. 



11. E. lathyrus Linn. : umbel 4-cleft, dichotomous ; leaves oppo- 

 site, lanceolate, entire. 



HAB. Near gardens and cultivated grounds. N. S. July, Aug. 

 $ . Introduced. Mole, Plant. 



12. E. corollata Linn. : umbel 5-cleft, 3-cleft, dichotomous ; floral 

 leaves and those of the stem oblong, obtuse ; inner segments of the 

 involucre petaloid, obovate. 



HAB. Dry fields. Can. to Car. July, Aug. If. Stem 1 2 

 feet high, erect, rarely branched. 'Leaves petioled, varying 

 somewhat in form. Floioers in a terminal umbel, conspicuous. 



13. E. pilosa Linn. : umbel 5-cleft, 3-cleft, bifid ; floral leaves ovate; 

 stem leaves lanceolate, somewhat hairy, serrulate at the summit ; pe- 

 tals entire. 



HAB. Wet woods. Can. to Vir. June, July. U.Stem 13 

 feet high. Found in Canada by Mr. Goldie. 



14. E. helioscopia Linn. : umbel 5-cleft, 2-cleft, dichotomous ; floral 

 leaves obovate ; stem leaves cuneiform, serrate, smooth ; capsule 

 smooth. 



HAB. Fertile soils. N. Y. -to Car. June, July. 0. Stem erect. 

 Leaves scattered, obovate or wedge-shaped. Capsule smooth. 



ORDER CVIII. URTICE^E. Lind. 



Flowers monoecious or dioecious, scattered or clustered. 

 Perianth membranous, lobed, persistent. Stamens definite, 

 distinct, inserted into the base of the calyx and opposite its 

 lobes. Ovary superior, simple ; stigma simple. Fruit a 

 simple indehiscent nut, surrounded either by the membranous 

 or fleshy perianth. Seed solitary, erect; embryo straight, 

 curved or spiral ; radicle superior. 



Trees, shrubs or herbs, with alternate leaves, often covered 

 with pungent hairs. 



1. URTICA. Linn. 



Monoecious, rarely dioecious. STERILE FL. Perianth 

 single, of 4 leaves, containing the cup-shaped rudiment of a 

 germ. Stamens 4. FERTILE FL. Perianth of 2 leaves. 

 Stigma 1. Nitt 1-seeded, shining. Monoecia. Tetrandria. 



27 



