FLORA OF OXFORDSHIRE. 279 
ANACHARIS. Rich. 
* A. Alsinastrum, Bab. Canadian Water Thyme. 
Elodea canadensis, Mich. Syme, E. B. ix. 81.1446. Nym. 678. 
Colonist. Streams and ponds. Widely distributed, but much less 
abundant about Oxford than formerly, and still decreasing. P. July- 
Sept. 
First record, W. Bazter, 1853. 
‘On taking a walk on Sunday, Aug. 28, 1853, across the meadow 
between St. Clement's and Iffiey, I was surprised to find Anacharis Alsin- 
astrum in a ditch in Long Meadow. It formed an uninterrupted dense 
mass from one end of the ditch to the other. Three or four years ago the 
plant was not known in a wild or even in a cultivated state, but about 
1850 a small specimen was introduced into the lower aquarium of the 
Botanic Garden. It is also abundant in the ditches on each side of the 
Canal, Jericho to the railway, Port Meadow, also in the Isis close to the 
Railway Station. The plants in the Canal and Isis must have travelled 
out of Warwickshire. Bx. MSS., 1854. 
2. Ouse. Hethe. 
3. Swere. Cherwell, too abundant, A. Fr. Noticed there by Mr. 
Beesley in 1854. Clattercut. 
4. Ray. Otmoor, Tackley Pond, Marston ditches and Cherwell, 
flowering freely, 1885. 
5. Isis. Plentiful in ponds at Ditchley, flowering at Binsey and in 
Oxford Canal. 
6. Thame. Long Meadow, 1854, Hd. Br. Iffley, Shotover ponds. 
7. Thames. North Stoke, Saunders’ Green, and in many ponds on the 
Chilterns, doubtless introduced by birds. 
The flowers break off and may be found floating on the water. This was 
very noticeable near Marston Ferry in 1885. 
Orv. LXXV. ALISMACEZ, Rich. 
Buromus. L. 
B. umbellatus, L. Flowering Rush. 
Top. Bot. 411. Syme, E. B. ix. 76.1443. Nym.678. Bx. 34. 
Native. Stream- and brooksides. Locally common. P. June, July. 
First record, Sib. 1794. Que Academie ipsius ambulacra preter fluunt 
flumina ... Butomo inter se fere constipatis luxuriant. 
8. Swere. Cherwell and Canal side, frequent, Bees. Neithrop, A. Fr. 
4. Ray. Cherwell side about Oxford, Bz. Near Merton, A. Fr. 
Islip, H. Bos. Otmoor, abundant between Islip and Oddington. 
5. Isis. Near Eynsham, Christ Church Meadow, pools on Botley Road, 
Sib. Cornbury Park, Blenheim Park, Osney, H. Bos. Medley, 
W. Whitwell. Charlbury, J. M. Albright. Evenlode side, near 
