MyriophfUtm.'] HALOEAGrE^. 139 



3. M. alterniflorum DC. — Alternate-flowered Water-Milfoil. 

 Districts I. II. III. IV. — VI. VII. VIII. IX. X. XI. XII. 



Lat. 51J-°-55i°. Througliout Ireland, probably. Type, Britisb. 



Ditches, ponds, and lakes, especially in peaty soil; frequent. 

 Fl. June-August. 



Sea-level in N. Antrim and S. Cork. To 1180 ft. in Donegal 

 {Hm-t); to 1330 ft. in Sligo {JSf. C.) ; to 1200 ft. in Mayo {Mart). 



CALLITEICHE Linn. 



1. C. verna Linn. (Aggregate) — Water Starwort. 



Districts I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. 



Lat. 51i°-55J°. Throughout Ireland. Type, British. 



Lakes, pools, ditches, and streams, also on damp ground ; 

 common. Fl. May-September. 



C. vernalis Koch. 



Districts — — — — V. — — — — X. — — 



Lat. 53i^°-54i°. East Ireland. 



Ditches, pools, and slow streams ; rare (?). Fl. May-September, 

 V. Abundant in muddy ditches near Huntsto-wn, Co. Dublin, 



1894; W. C. — X. Lower demesne, Tanderagee, Armagh (Hev. S, 



W. Lett) : Wats. B. Ex. C. Rep. iSg^. 



Probably not infrequent in Ireland, and confounded with other 



segregates of C. verna. 



C. stagnalis Scop. 



Districts I. II. — IV. V. VI. VII. VIII. IX. X. XI. XII. 



Lat. 51i-°-55i°- Throughout Ireland, probably. 



On wet mud and in muddy ditches ; common. Fl. May-September. 



Sea-level in N. Antrim and in S. Cork. To 1200 ft. in Sligo 

 and in Dublin (iV. C); to 1370 ft. in Mayo and to 1700 ft. in 

 Tipperary {Hart). 



The commonest of the Irish Callitriches. 



C. hamulata Kuetz. 



Districts I. II. — IV. V. VI. VII. VIII. — X. XI. XII. 

 Lat. 51J°-55J°. Throughout Ireland, probably. Type, British. 



Lakes, ponds, and streams ; frequent. Fl. June-September. 

 Gdleifuge B. 



