148 



XXIX. HALORAGACE^. 



of 4 indehlscent carpels slightly cohering by their inner anal 

 and eventually separating. Seeds solitary, pendulous. Albuni7 

 fleshy, sometimes very thin. Emhrijo straight. Radicle ^u 

 perior. — Mostly Herbs {the British ones especially), aquatics' 

 Leaves various as to insertion. ^^"^ -*- — ' -- -'^ 



^f 



/ 



The stamens and pistils ofte^-^ 



1. 

 2. 



HirruRis, Stam 



Myhiophyllum. 



seeded. 



1. Stigma 1. Fruit 1-seeded. 

 Monoecious. Stam. 4 — 1. 



Stigmas 



4 



Fruit 4. 



1. HippuRis Linn. Mare's Tail. 



germen. 



Perianth single, superior, forming a very indistinct rim to tlie 



Stam. 1. Style 1. Fruit l-celled, 1-seeded,— Named 

 from InTToq, a horse^ and ovpa, a tail. 



1. 11. vulgaris L. (common M.) ; leaves linear 6 — 8 or 10 in 

 a whorl. E. IJ. t. 763. 



Ditches and, usually, stagnant waters; less frequent in Scotland. 



1/.. 6, 7 Siem erect, simple, jointed. Whorls of about 8 leaves 



which are callous at the point. Flowers at the base of each of the 

 upper leaves, not unfrequently destitute of stamens. In deep streams 

 of water this plant attains to 2 or 3 feet, with the leaves excessively 

 crowded, 3 and even 4 inches in length, pellucid, with an opaque 

 nerve, their points not callous ; the whole plant subuierged and barren. 



2. Myrtophyjllxjm Zinn. Water-Milfoil. 



Monoecious. 

 Stam. 4 — 8. 



wanting. 



Barren fi. Cat. inferior, of 4 leaves. Tet 4. 

 Fertile fi. (7a^. 4-lobed. Pet. A. Sfa7n. 4— 8,ov 

 Stigmas 4, sessile. Fruit of 4, sessile, subglobose, 

 1-seeded carpels, at length separating. — Name fivptoQ^ a mijriad^ 

 and (jvXXov^ a leaf^ from its numerous leaves. 



1. M.verticilldfum'L. (whorled TF.) ; flowers all whorled sub- 

 tended by pinnatifid or pectinate bracts lonj^er than the flowers. 



^;^. t. 218. - ■ - "- 



M. pectinatum DC. 



7,8. 



Ponds and ditches throughout England and Wales, 1[. 

 Bracteas variable in length ; when many times longer than the flowers, 

 it is M, verticillatum DC. ; when only 2 — 3 times as long, it is M.pecti- 

 natum DC. But between these there are intermediate forms. 



2. M. spicdtum L 

 than but subtended 

 spike. E. B. t. 83. 



Ditches and stagnant waters, common, 

 much branched. 



submerged. 



^ 



(spiked W.) ; flowers all whorled longer 

 by bracts forming an interrupted leafless 



11 . 6, 7.— Stems slender, 

 Leaves 4 in a whorl, finely pectinated and always 

 Spikes slender, 3 — 5 inches long, erect when in bud. 

 Bracts small, lower ones pectinate, upper ovate and entire. This only 

 differs from some forms of the last by the still shorter bracteas. 





