294 75. URTICACE^E. 



parallel in pairs bluntly keeled on the back, styles divaricate and 

 reflexed over the sides of the fruit, bracts Q.E. B. S. 2606. 

 L. linear, upper ones broader in the middle. Fr. stalked, small, 

 the size of that of C. verna. . sessilis (Bab.) ; 1. linear, upper 

 floating 1. ovate-spathulate, fr. sessile. I have never been able 

 to find any bracts to the fl. of this plant. It is only in that 

 respect that it differs from C. hamulata (Kiitz.) which has falcate 

 deciduous bracts. Marshes. j3. Lakes. A. or P. VI. IX. 



4. C. autumnalis (L.) ; fr. nearly sessile, lobes spreading in a 

 star broadly and acutely winged at the back, styles spreading, 

 bracts 0, 1. all linear and broadest at the base. E. B. S. 2732. 

 Fr. 4 times as large as in C. verna, dark brown, 1 or 2 of the lobes 

 often abortive. L. dark green, all submersed, very abrupt at the 

 end. Rare. Anglesea. Several Scottish lakes. Cong, Mayo. 

 A. or P. VI. IX. 



Order LXXV. URTICACE^E. 



Fl. monoecious, dioecious, or rarely perfect. Perianth inferior, 

 4 3 6-parted, imbricate or entire in the female flowers. Stam. 

 definite, free, inserted at the base of the perianth and opposite to 

 its lobes. Ovary free, 1-celled ; ovules solitary. Stigmas 1 2. 

 Fr. not bursting. See G. F. G. MonochL 28. 29. 30. 



1. PARIETARIA. Fl. polygamous, surrounded by an involucre. 

 Perigone bellshaped, 4-parted. Stam. 4. Style filiform. 



2. URTICA. Fl. monoecious or dioecious. Males in loose 

 racemes; perianth 4-parted; stam. 4. Females in capitate 

 racemes ; perigone 2-parted ; stigma sessile. 



3. HUMULUS. Fl. dioecious. Males with the perianth 5- 

 parted; stam. 5. Females with the perigone scalelike, open, 

 hidden by the scales of an oval catkin; stigmas 2, elongated. 



1. PARIETARIA Linn. Wall Pelletory. 



1. P. erecta (Koch); 1. oblong-oval attenuate at both ends 

 tripliveined, perianth bellshaped equalling the stamens. St. 

 mostly erect and simple or with a few short branches falling 

 short of the leaves. Inv. of two 3-lobed 3-flowered segments 

 with a female fl. between them, and two small simple segments 

 alternating with them ; each lateral lobe of each segment bearing 

 a pair of small leaves on its face with the lateral fl. between 

 them. Old walls. P. VI. IX. 



2. P. diffusa (Koch) ; 1. oval acute at both ends tripliveined, 

 perianth, of perfect fl. ultimately elongated and twice as long as 

 the stam. (red). P. officinalis Sm., E. B. 8J9. St. prostrate or 



