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NOTES ON OXFORD PLANTS. 227
no danger of confusing it with any other species, and, as it is in
active growth throughout the year, it affords matter for ahnost
daily observation. Perhaps no botanist, however skilful, can grasp
the idea of a "species" in the genus Putumo(jeton who has not
watched the growth of some one form throughout one year at least.
At the end of that time he will have been able to observe enough
of the wonderful changes these plants undergo to enable him to
correct to some extent the false conclusions to which such dried
specimens as are usually found in herbariums would otherwise
infallibly lead him.
/'. crispus is abundant throughout all the Fen-land water, and
is probably to be met with in every county in Great Britain.
NOTES ON OXFOED PLANTS.
By G. Claridge Druce, M.A., F.L.S.
Four j^ears having elapsed since the publication of the Oxfordshire
Flora, it may be well now to place upon record some of the
additions which have been made.
For the Ouse district, which had been imperfectly explored,
Mrs. Worley sent a list of plants noticed by her about Hethe, which
included some interesting species. Two of them, (rfnista aiKjUca
and Vaccinium Myrtillus, I have hitherto not been fortunate enough
to meet with in the county. They are exceedingly rare in the
locality where they were noticed by Mrs. Worley, relics probably of
an ericetal vegetation now almost destroyed.
The species additional to the county are marked *. The
numbers following the localities denote the divisions, as defined in
the ' Flora.'
Adonis autumnalis L. Colonist. Cottesford, Mrs. Worley, 2.
lUmuncidus acris L., var. mnltifidus DC. Chinnor 7. — R.
Fhiiiivnila L. Cottesford, Mrs. Worley, 2. — Var. Iatifi)lins Wallr.
lleadington Wick, 4.—Var. uvatns DC. Pond near Nettlebcd, 7.
U. /trtcro/jhyllus Web. Pond near Witney, 5.
IJcilchorus viridis L. Our plant appears to be the H. occidentalis
Rcuter, the glabrous form of aggregate H. viridis L., but which,
perhaps, may be better described as var. occidentalis (Rent.).
Deljdiinium Ajacis Reich. Bayswater, Rev. F. Woods. Plentiful
in a field near Summer town, 4.
Nitiiilii
Worley, 2.
damasceim L. Casual. Corn-fields near Hetho, Mrs.
Siimjduca alba L. Was first recorded as an Oxford plant in
Lobel, 157G.
i'ajiaccr li/ucaslj.—Var. rn/nrii mihi is not infrequent on sandy
soils as at Headi)igton, 4 ; Radlcy, ; Ipsdcn, Goring, and l-Jartoii,
7. A plant witli decumbent stem and pale flowers is pru1)ably the
var. Iluuhidci Vig. It occurred on waste ground near the gasworks,
Oxford, 5.
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