URTICACE.E. 137 



ORD. 61. SCLERANTHACE^E. 



1. SCLERANTHUS. Peri, 5-cleft, contracted at the mouth. St. 

 10, often with 5 abortive, inserted in the mouth of the tube. 

 Styles 2. Fruit enclosed in the hardened tube of the 

 perianth. 



ORD. 62. POLYGONACE^S. 



1. POLYGANUM. Peri. 5-partite. St. 5 8. Styles 2 3. Achene 



triangular, sometimes compressed. 



2. RUMEX. Peri. 6-partite; the 3 inner segments large, at length 



covering the triquetrous fruit, enlarged, and often bearing 

 tubercles. St. 6. Styles 3. 



3. OXYRIA. Peri. 4-partite; the 2 inner segments larger than the 



others. St. 6. Styles 2. Acheiie compressed with a mem- 

 branous wing. 



ORD. 63. THYMELACE^. 



1. DAPHNE. Peri. 4-cleft. St. 8, inserted in the tube. Berry 

 fleshy, 1 -seeded. 



ORD. 64. EMPETRACE.E. 



1. EMPETRUM. Barren fl. Peri. 3-partite, petaloid, with several 

 external bracts. St. 3. Fertile fl. as in the barren, with 1 

 style and a peltate stigma. Fruit a globose 1 -celled berry. 



ORD. 65. EUPHORBIACE^E. 



1. MERCURIALIS. Fl. dioecious. Barren fl. Peri, tripartite. St. 



916. Fertile fl. Per. tripartite. Styles 2. Capsule 2- 

 celled, 2-seeded. 



2. EUPHORBIA. Fl. monoecious, collected into a small head sur- 



rounded by a bell-shaped involucre. Barren fl. consisting of 

 one st. jointed near the middle. Fertile fl. with a 3-lobed 

 ovary. Styles 3. Peri. none. 



ORD. 66. CALLITRICHACE^E. 



1. CALLITRICHE. Flowers monoecious. Bracts 2, fistular. Peri. 

 none. St. 1, rarely 2. Ovary compressed. Styles 2. Fruit 

 4-celled, 4-lobed. 



ORD. 67. URTICACE.E. 



1. URTICA. Monoecious or dioecious. Barren fl. Peri. 4-partite. 

 St. 4. Fertile fl. Peri. 2-partite. Stigma 1, sessile, tufted. 

 Seeds flattened. Le. opposite. 



