WATSON EXCHANGE CLUB REPORT 201 
Potamogeton Drucei Fryer, Mon. Brit. sbrearvgeere cn, p- 31, t. 21. 
Loddon, No. 4593, Herb. Normale Dér ‘fler, Aug. 1904. 
«Panicum colonum L. 3. Rea rapes on pea ballast, 1906, 
with P. glabrum Gaud., P. Crus- galh L., Setaria viridis Beauy.., 
S. glauca Beauv., and S. verticillata Beauy., all aliens. 
Astheththieon: elatius M. & K. *var. biaristatum Druce. 
A; Wyt tha 
*Keeleria britannica Domin. 2. Besilsleigh. 3. Streatley, &e. 
Melica uniflora Retz. 2. Besilsleigh. 
eae heterophylla Lam. 3. In Billingbere Wood, and under 
appearance of a native species in this —_ being very 
On Kimmeridge Clay, Boar’s Hill aR vina L. +*var. glauca 
Koch. 4. Reading, Coley — st  Stanaield not native. 
“Bromus leptostachys Pers. r Pan ngbourn ; a variety of 
B. hordeaceus L. — +B. aici cet 3. On railway ballast 
Reading. 
Lolium perc x multiflorum. 1. Wytham; with Dr. Domin, 
who showed it 
“ia naer ahs se Greene. 4. Wire Mills, Dr. Stans- 
field ; Welford. 
Pakssodoes vulgare L. 5. “P. bifurcata pinnulis serratis on 
ye walls of Windsor Castle,” Adam Buddle’s Herb. in Herb. 
Brit. Mus 
WATSON EXCHANGE CLUB REPORT, 1908-1909. 
[THE following are amo ong the more Sere of the notes 
pabhidhed 3 in the last Report of the Club; for the numerous notes 
on fiosa, Rubus, HMteracium, and other évitioal genera, reference 
i are glad to see t 
arning conveyed in the oeree | sentence of the paragraph 
prefixed by the distributor, Mr. A. B. J. ackson, to the Report :— 
ne or two members, however, erred in the opposite a 
rarities, and their attention is called to the remark at the com- 
mencement of the list of desiderata, that in gathering plants they 
are to take care they run no risk of ae or appreciably 
diminishing a plant in any locality.” —Ep. Jour N. Bor.] 
_, BARBAREA ARcuATA Reichb. Origin, side of drain-ditch, 
Upton-on-Seyern, Wores., v.-c. 37. Cult. t. Ledbury, a 14, and 
Aug. 13, 1907.—S. H. Bicknam. Beautiful specimen : of this 
plant, which is doubtless the B. arcuata of — and 
Continental botanists, but it i from sage . arcuata of 
Reichenbach (Icones Fl. Germ. ii. fig. 4356) in character on 
which Syme (E. B. ed. iii. vol. i. 173" lays great ites, namely, 
in the seed being broad and short. In Reichenbach’s type, which 
