120 30. HALORAGACE.E. 



St. 23'. 2. Usually glabrous. Pet. shorter than the membra- 

 nous sepals, narrow below. Fr. soon falling. Bracteoles deci- 

 duous. 13. C. intermedia (Ehrh.) ; fl. larger, sep. less membra- 

 nous equalling the petals. Whole plant much larger. Woods 

 and thickets in mountainous districts. P. VII. VIII. 



Order XXX. HALORAGACE^E. 



Cal. adnate with the ovary, limb minute. Pet. minute, from 

 the throat of the calyx. Stam. 1 8, inserted with the petals. 

 Ovary of 1 or more cells. Styles equal in number to the cells. 

 Fruit dry, not bursting, usually crowned with the rim of the 

 calyx. Seed pendulous, with a small quantity of albumen. 



1. MYRIOPHYLLUM. Monoecious. Cal. 4-parted. Pet. 4, 

 fugitive, longer than the calyx in the male, small and re- 

 flexed or in the female. Stam. 8. Styles 4, villose. Fr. 

 tetragonal, separable into 4 hard nuts. G. F. G. Monochl. 3. 



2. HIPPURIS. Calyx-limb very minute, obsoletely 2-lobed. 

 Pet. 0. Stam. 1. Style filiform Stigma simple, acute. 

 Fruit a 1 -celled nut. G. F. G. Monochl. 2. 



1. MYRIOPHYLLUM Linn. Water Milfoil. 



1. M. verticillatum (L.); fl. all axillary whorled, bracts pin- 

 natifid. E. B. 218. L. whorled, pinnatifidly divided into se- 

 taceous segments. Bracts more or less longer than the flowers, 

 pinnatifid or (M. pectinatum DC.) pectinate. Ponds and ditches, 

 rare. P. VII. VIII. 



2. M . spicatum (L.};fl. whorled/ormm# a leafless spike, bracts 

 small entire, spike erect when in bud. E. B. 83. L. 4 in a 

 whorl, submersed, lower bracts often pectinate. Ponds and 

 ditches. P. VI. VII. 



3. M. alterniflorum (DC.); sterile fl. alternate about 6 form- 

 ing a leafless spike, spike nodding when in bud afterwards erect, 

 fertile fl. about 3 together in axillary whorls at the base of the 

 spike. E. B. S. 2854. L. 3 or 4 in a whorl, submersed. 

 Ponds and ditches. P. V. VIII. 



2. HIPPURIS Linn. Mare's Tail. 



1. H. vulgaris (L.); 1. linear 6 12 in a whorl with a callous 

 point. E. B. 763. St. 44. 1. St. simple, or sometimes branch- 

 ing at the base, erect. Fl. in the axil of each of the upper leaves, 

 often without stamens. In deep water the submersed leaves are 

 elongated flaccid pellucid and not callous at the end. In stag- 

 nant water and slow streams. P. VI. VII. 



