202 DICOTYLEDONS. ARIbTOLOCIIL-E. 



Order V. IJllTICE.E. 



Flowers ))cifect, or with the cnrlhcrs and pistils distinct. Peri- 

 anih tVee, o — 5-cleft, persistent. Siam. 3 — 5, hypogvnous, 

 usiiallv with an elastic tilanient. Ovary 1. SUjle simple or 

 double or none. Stigma simple or double. Aclienia, or little 

 Drupes, covered vvith the persistent perianili, solitary or uni- 

 ted on a dilated fleshy receptacle. Seeds pendidous, with or 

 without albumen. Embryo straight, curved or spiral. Ra~ 

 elide superior. 



Stems herbaceous or woodv. Leaves alternate or opj)ositc, ge- 

 nerally with stipules. Flowers either in heads or racemes. 

 lyirb. 



1. URTICA. 



Mmicccious or dioecious. Barren Fl. Perianth of A leaves, 

 containing the cup-shaped rudiments of a gernien. Fertile 

 FL Perianth of 2 leaves, ylcheniinn 1 -seeded, shining. 



1. U. Jircns, leaves opposite elliptical witli about 5 ribs, clusters 

 of flowers nearly simple, p. 271. — V/'aslc places. 



2. U. dioica, leaves ovate acuminate cordate at the base, clus- 

 ters of flowers much branclied in pairs mostly dioecious, p. 271. 

 — Hedges. 



2. PARIETARIA. 



Flowers often imperfect, surrounded by a many-cleft invohicrun). 

 Periuvth 4-cleft. Stam. 4. Filaments at flrst incurved, then 

 expanding with an clastic force. Ovary \. Style \. Ache- 

 viutn 1-seeded, inclosed in the enlarged perianlh. 



1. P. aJJJcinalis, leaves ovato- lanceolate, involucre of many ovate 

 leaflets, p. 56. — TFalls. 



3. HUMULUS. 



Dioecious. Barren Fl. Perianlh a'lngh, 5 -parUte. Slain, b. 

 Anthers with 2 pores at the extremity. Fertile Fl. amenta- 

 ceous. Scales of the catkin large, persistent, concave, entire, 

 single-flowered. Perianth 0. Styles 2. Seed i. 



1. II. Lvpulus. p. 2S8.— Hedges. 



Order VI. ARISTOLOCHLE. 



Perianth of 1 piece, adherent. Stam. definite, epigynous. Style 

 simple, very short. Stigma n)any-lobed in a radiating man- 

 ner. 0^•«;y many-celled. Ce//^ many-seeded. Capsule dry 

 or berried. Seeds very numerous. Embryo very minute, en- 

 tire, at the base of the corneous albuwcn. JSli'b. Br. 



