OF BRITISH PLANTS. 429 



Order LXX. SANTALACE^E. 



Perianth adnate to the ovary, its limb with from three to five seg- 

 ments, valvate. Stamens four or five, opposite to the segments. Ovary 

 one-celled, with from one to four ovules from near the apex of a central 

 placenta ; style one. Fruit drupaceous. 



1. Thesium, 111,135. 



Order LXXI. ARISTOLOCHIE^. 



Perianth adnate to the ovary below, above tubular, with an irregularly 

 lobed, and often dilated limb. Stamens six, ten, or twelve, epigynous. 

 Ovary with three or six cells ; style simple, stigma radiate. Fruit 

 many-seeded. 



1. Aristolochia, 334, 342. 2. Asarum, 210, 210. 



Order LXXII. EMPETRE^E. 



Dioecious. Perianth of several hypogynous scales in several rows. 

 Stamens free, equal in number to the inner row, and alternate with 

 them. Ovary free, on a fleshy disk, with three, six, or nine cells; style 

 one, stigma radiate. Fruit fleshy, with bony cells. 

 1. Empetrum, 366, 377. 



Order LXXIII. EUPHORBIACEJL 



Usually monoecious. Perianth lobed, or none. Barren flowers with 

 one or more stamens ; anthers two-celled. Fertile flowers with a su- 

 perior two- or three-celled ovary ; styles two or three ; stigma com- 

 pound or simple. Capsule opening elastically, with one or two sus- 

 pended seeds in each cell. 



1. Buxus,344, 358. 2. Euphorbia, 343, 345. 



3. Mercurialis, 367, 381. 



Order LXXIV. URTICACE^. 



Flowers monoecious or dioecious, scattered, or in catkins. Perianth 

 inferior, with three, .four, or six segments, or entire. Stamens opposite 

 the lobes of the perianth. Ovary free, with one or two cells, and soli- 

 tary ovules ; stigmas one or two. Fruit an achenium, with one seed, 

 or several combined and immersed in the persistent fleshy perianth, or 

 upon large fleshy receptacles. 



URTICES. CANNABINES. 



1. Parietaria, 96, 104. 3. Humulus, 367, 379. 



2. Urtica, 344, 358. 



Order LXXV. ULMACE^E. 



Flowers perfect or polygamous. Perianth inferior, often irregular. 

 Stamens opposite to the lobes of the perianth. Ovary free, two-celled, 

 with solitary, pendulous ovules ; stigmas two. Fruit indehiscent, mem- 

 branaceous, or drupaceous, with one or two cells. 



1. Ulmus, 112, 138. 



Order LXXVI. AMENTACE.E. 



Flowers monoecious, or dioecious, rarely perfect. Barren flowers 

 2 



