U2 HALORAGE/E. [MyriophyUtm. 



Muff Glen, Faughan Vale, County of Derry ; Mr. D. Moore. In 

 Muskerry, and near Skibbereen, County of Coik ; Mr. J. Drummond. 

 8. Collin Glen near Belfast. — FL July, Aug. % . — Resembling the 

 last, but much smaller ; the leaves are decidedly cordate, and the pe- 

 tioles longer. The var. ?>. is larger and more pubescent ; but in the 

 cordate leaves, and other characters, it better accords with this species 

 than with C. lutetiana. 



Ord.32. HALORAGEiE. Br. Water-Milfoil Family, 



Tube of the calyx adherent with the ovary for its whole 

 length ; the limb divided or none. Petals inserted upon the top 

 of the calyx, alternate with its lobes and equal to them in num- 

 ber, or wanting. Stamens inserted in the same place, double 

 the number of the petals, equal to them or fewer. Ovary ad- 

 herent with the calyx, often many-celled ; styles none ; stigmas 

 equal in number to the cells, papulose or pencil-formed. Fruit 

 1 , or many-celled, indehiscent, membranaceous or bony, the cells 

 one-seeded. Seeds pendulous in the cells, with a fleshy albu- 

 men. Embryo central, straight : radicle superior, rounded, 

 elongated : cotyledons short. — Herbaceous or somewhat shrubby 

 often aquatic plants, with alternate, opposite or whorled leaves. 

 Flowers axillary or arranged in terminal spikes, sometimes moncecious 

 or dioecious. 



1. Myriophyllum. Linn. Water-Milfoil. 



Barren fl. Calyx inferior, of 4 sepals. Petals 4. Stamens 8. 

 Fertile Jl. Calyx of 4 sepals. Petals 4. Stigmas 4, sessile. 

 Nuts 4, sessile, subglobose, 1-seeded. — Name; /.ivpio? a 

 myrid, and (pvWov, a leaf, from its numerous leaves. 



Monozcia. Polyandria. 



1. M. spicatum, Linn. Spiked Water-Milfoil. Sterile flowers 

 forming an interrupted leafless spike. Br. Fl. 1. p. 406. E. 

 Fl. v. iv.p. 143. E. Bat. t. 83. 



Ditches and stagnant waters, frequent. Fl. July, Au?. It. — Stems 

 slender, much branched. Leaves four in a whorl, finely pectinated, 

 and always submerged. Spikes slender, 3 — 5 inches long. 



2. M. verticillatum, Linn. Wlwrled Water- Milfoil. Flowers 

 all axillary. Br. Fl. 1. p. 406. E. FL v. iv. p. 143. E. Bot. t. 

 218. 



In ponds and ditches, much less common than the former. Plentiful 

 about Limerick ; Mr. W. H. Harvey, who sent me specimens. Bally- 

 phehane-bog, near Cork; Mr. J. Drummond. FL July; %. — Stems 

 covered to the top with leaves ; flowering part rising above the water. 

 Leaves five in a whorl, pinnatifid ; whorls of flowers in the axils of the 

 leaves. 



