XXXVi PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 
SCIENTIFIC COMMITTEE. 
January 13, 1920. 
Mr. E. A. Bowles, M.A., in the Chair, and seven members present. 
British plants. — Mr. Eraser showed preserved specimens of Senecio squalidus, 
a plant well known for long as growing upon Oxford walls, but now spread to 
other places, including London. He also showed a hybrid between S. squalidus 
^ and S. viscosus, originally from Ireland, and Mercurialis annuus, a weed of culti- 
vated gardens in several parts of south and east England. 
Pleione pogonoides. — Mr. Elwes said that he had been cultivating plants under 
this name, but had found them to be identical with Pleione humilis, so far as he 
had been able to discover. 
Oncidium x incurnephorum. — Mr. G. Wilson showed on behalf of Messrs. 
Charlesworth a hybrid between Oncidium corynephorum, a species with a scandent 
habit, and O. incurvum. The hybrid lacks the climbing habit. 
Fruits of Davidia. — Mr. Bowles showed twin fruits of Davidia involucrata 
from the garden of Mr. Christie at Framhngham Pigot, Norfolk. The inflores- 
cences producing these twin fruits had three bracts, and the phenomenon had 
occurred in earlier years as well as in 1919. 
Two forms of berry on Holly. — Mr. Bowles also showed a piece of holly bearing 
a red berry on an otherwise yellow-fruited plant. 
Cypripedium insigne twin-flowered. — Mr. Smith of Hatchford Park Gardens, 
Surrey, sent several specimens of Cypripedium insigne having two flowers on a 
scape. The plants producing them were particularly vigorous and the flowers 
lacked nothing in size. The plants had been manured occasionally with sulphate 
of ammonia. 
Scientific Committee, January 27, 1920. 
Mr. E. A. Bowles, M.A., in the Chair, and thirteen members present. 
Various Plants. — Mr. H. J. Elwes showed from his garden and commented 
upon Peiasites alba, a high alpine, and P. japonica from Kamtschatka ; 
Lysionotus warleyana, the curious capsules of which take six months to ripen ; 
Cotyledon roseatum, a nearly hardy plant, flowering in mid-winter, and with 
brightly tinged foliage ; the hybrid Iris persica x sindjarensis, the only Juno 
Iris which persisted in his garden ; Rehmannia Henryi from Ichang ; Aeschyn- 
anthus lobatus, the corolla of which remains in ' bud ' until the calyx tube is 
well developed, as is the case in Columnea ; Pleione humilis in two distinct 
forms ; Tanaea penangiana, an uncommon orchid, and Heeria vittata, a nearly 
hardy plant from Sikkim. 
Alder catkins. — Mr. Bowles showed catkins of a distinct Alder, Alnus cordata, 
and drew attention to the differences between that species and A . glutinosa. 
Viburnum fragrans. — Mr. Bowles also showed flowers of this new species 
from China ; he remarked that the plant was not only very sweetly scented 
but floriferous, and that, although it produces its flowers in January, it will with- 
stand frost uninjured. 
The Functions of the Committee. — Mr. Elwes raised certain points in connexion 
with the work of the Committee, and after discussion it was resolved " That 
this Committee desire to express the hope that the plants now reaching Great 
Britain from Forrest's collections shall be adequately described and illustrated 
in the Society's Journal, and they wish also to express their willingness to 
do their utmost towards this end." 
Scientific Committee, February 10, 1920. 
Mr. E. A. Bowles, M.A., in the Chair, and four members present. 
Willow Seeds. — Mr. J. Eraser remarked upon the part played by the wind in 
the distribution of the seeds of the willow. 
Primula Juliae x elatior. — Dr. Rosenheim showed specimens in illustration of 
the following note : A reciprocal cross was made between P. Juliae and P. elatior 
