EXHIBITION MEETING^ 1949 
59 
there were three strange weeds there, one being a large plant 
of Datura Stramonium L., 4 feet tall, and the Xanthium and 
Physalis. 
Carrot-field aliens in West Norfolk, by R. P. Libbey & E. L. Swann. 
This exhibit showed the results of six years’ field-work in the 
carrot fields of vice-county 28, which was carried out to ascertain 
the number and variety of alien plants which were being intro- 
duced through the medium of imported carrot seeds. Apart from 
varieties some 25 species w'ere found and they ivere : — 
Matthiola bicomis DC. South Eur. One plant only found. 
Ilelmnthus anrnms L. North Amer. Occasional. 
Centaurea solstitialis L. Eur. Very rare. 
Lactuca sativa L. Found occasionally 1949 only. 
('usc'uta campestris Yuncker. Very rare N. Amer. sp. Deter- 
mined by Dr Yuncker. 
Solanum nigrum L. var. Dillenii (Schultes). Common 1945 only. 
Solarium sarrachoides Sendt. South Amer. Both entire and 
tooth-leaved plants were shown. It would appear that leaf- 
outline does not indicate specific differentiation as entire 
and toothed margins may be found in populations of Sola- 
num nigrum. Fairly common in 1949 oul.y. 
Arnaranthus chlorostachys Willd. Eur. Abundant. 
A. retro flexus L. Amer. Occasional. 
A. alhus L. N. Amer. Occasional. 
.4. albas L. sub-var. rubicundus Thell. Very few plants in one 
field only ; probably new to the British Isles. 
A. blitoides S. Wats. N. Amer. One field only in 1949. 
Chenopodiurn rubrum L. N. Amer., &c. 
Ch. murale L. N. Amer., &c. 
Kocliia scoparia (L.) Schrad. Central Eur. Med. Reg. V. rare. 
Salsola pestifer Nelson. N. Amer., &c. Occasional. 
Polygonum patulum M. Bieb. Cent. Europe. Three plants 
only. 
Panicum miliaceum L. Cosmopolitan. Rare in carrots. 
Panicum capillare L. var. occidentale Rydb. {P. barbipvlviri- 
atum Nash). North American. Rare. 
Ecliinochloa crvs-pavonis (H.B.K.) Schult. S. American. A 
rare plant. 
Ecliinochloa Crus-galli (L.) Beauv. Cosmopolitan. Many forms 
of this polymorphic species were found ranging from a very 
long-awned variant (probably var. aristata Gray) to an 
awnless, stiff, erect variant which “ appears to be the plant 
known to North American botanists as E. pungens (Poir.) 
Rydb.” (C. E. Hubbard in litt.) Field- w'ork suggests that 
the expediency of retaining any varietal names seems 
doubtful. 
