OF BRITISH PLANTS. 429 



Order LXX. SANTALACE^E. 



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

 segments, 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. ABISTOLOCHIEjE. 



Perianth adnate to the ovary below, above tubular, with an irre- 

 gularly 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 LXXH. EMPETRE JE. 



Dioecious. Perianth of several hypogynous scales in several 

 rows. Stamens free, equal in number to the inner row, and alter- 

 nate 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 LXXm. EUPHORBIA CE^E. 



Usually monoecious. Perianth lobed, or none. Barren flowers 

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

 with a superior two- or three-celled ovary ; styles two or three ; 

 stigma compound or simple. Capsule opening elastically, with one 

 or two suspended 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. Pe- 

 rianth inferior, with three, four, or six segments, or entire. Sta- 

 mens opposite the lobes of the perianth. Ovary free, with one or 

 two cells, and solitary ovules ; stigmas one or two. Fruit an ache- 

 nium, with one seed, or several combined and immersed in the 

 persistent fleshy perianth, or upon large fleshy receptacles. 



URTICEJE. CANNABINE^E. 



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



2. Urtica, 344, 358. 



Order LXXV. ULMACEJE. 



Flowers perfect or polygamous. Perianth inferior, often irre- 

 gular. Stamens opposite to the lobes of the perianth. Ovary free, 

 two-celled, with solitary, pendulous ovules ; stigmas two. Fruit 

 indehiscent, membranaceous, or drupaceous, with one or two cells. 

 1. Ulmus, 112, 138. 



Order LXXVI. AMENTACEJE. 



Flowers monoecious, or dioecious, rarely perfect. Barren flowers 

 2O 



