82 
PEllSONALIA 
PERSONALIA 
POTEIUUM, SANGUISOBBA AND ALLIED GENERA 
Mr. T. R. Laycock is interested in preparing a mono- 
graphic revision of the above, and would be grateful for both material 
and information. The material may be living (especially fruits), herbar- 
ium and/or pickled for anatomical and cytological study. He is com- 
piling the accounts of the species in the Biological Flora of the British 
Isles and would again be grateful for any help. 
GENUS LEDUM IN BRITAIN 
Mr. B. W. Ribbons will be grateful for any information relating to 
the genus Ledum in Britain. Since the plants are so rare, specimens 
should not be collected in the first instance. He will be glad especially 
to hear of the existence of any herbarium specimens. 
LITHOSPEBMUM ABVENSE L. AND L. OFFICINALE L. 
Mr. J. S. L. Gilinour would be glad to receive unlimited quantities 
of ripe seed of LAthospermum arvense and L. officinale. It has been 
shown that some species of the genus contain a substance which is of 
great importance for medical purposes. Different lots of seed can be 
bulked if more convenient, though it would be preferable to keep seed 
from different localities separated; seed of each species should be kept 
separate. Seed should be sent to him, labelled with name of species and 
place and date of collection, at the University Botanic Garden, Cam- 
bridge. Postage will be repaid. 
POLYGONIUM SECT. GENTINODE DC. 
Mr. D. W. Jowett is working on the above section of Polygonum in 
Britain. He would be very grateful for both material of and informa- 
tion on P. inaritimum L., P. Bail Bab., P. aviculare L. (P. heterophyl- 
lum Lindm.), P. aequnle Lindm., F. rurivagum Jord., P. calcatum. 
Lindni. and F. litornle Link. The material may be living (including 
seed), herbarium and/or piikled for anatomical and for cytological study. 
ABTEMISIA MABITIMA L. 
Dr. H. Stubbe writes: — “For systematic and biochemical purposes 
we need seeds of the polymorphous Artemisia maritima. I should thank 
you very much if you would kindly help me in obtaining these seeds 
from many habitats in your country. Please send parcels to me at 
Holderlinstrasse 11, Berlin-Charlottenburg 9.” 
