92 ifr Burkill, Notes on the Plants [May 15, 



(4) Notes on the Plants distributed hy the Cambridge dust- 

 caiis. By I. H. Burkill, B.A., Gonville and Caius College. 



The dust of the Cambridge streets, with the materials which 

 chance to be scattered on them, with the droppings of animals 

 which fall on them and with the seeds which by one agent or 

 another come to lie in them, is now deposited on the low ground 

 of Coe Fen with the object of raising the level. It is this circum- 

 stance which has enabled me with comparative ease to collect 

 materials for these notes, and so to see the extent of man's work 

 in the distribution of seeds in and about a town. 



On the small area of approximately three-quarters of an acre 

 ninety-nine species whose names follow have been found: — and 

 counting in the well-marked variety italicum of Lolium perenne 

 we get exactly one hundred forms. 



The following signs are used in this table : 

 a, only one plant; 

 /5, several plants; 

 7, fairly abundant; 

 h, common; 

 e, very common; 



E,, a plant habitually growing on our roadsides; 

 G, a plant habitually seeding in our gardens; 

 T, a plant, whose seeds, etc. man carries about for his own 

 purposes, either for his own food (T. f ), or as a con- 

 stituent of hay (T. h.), or in cereals or str-aw (T, s.), or 

 as food for cage-birds (T. b.). 



Ranunculus sceleratiis L. R. Acer pseudo-platanus L. /3. G. 



Ranunculus acris L. E. Cytisits Laburnum L.? a. G. 



Ranunculus r&pens L. 8. R. Medicago lupidina L. /3. R. (or T. h.) 



Delphinium Ajacis Reich. G. Melilotus alba Desv. T. h. 



Papaver somniferum L. G. Trifolium pratense L. R. (or T. h.) 



Palaver Rhoeas L. /3. T. s. Trifolium, repens L. R. 



Cheiranthus Cheiri L. /3. G. Trifolium fragifernm L. ^. — 



Sisymbrium officinale Scop. R. Trifolium procumbens L. R. 



Erysimuin Gheiranthoides L. T. s. Trifolium dubium Sibth. R. 



Brassica JVapus L. (Rape.) T. Vicia sepium L. a. T. s. 

 BrassicaSi7iapis Visiani. y. R. (orT.s.) Vicia Faba L. /3. T. f. 



Diplotaxis tnuralis D.G. y. R. Pisum sativum, L. T. f. 



Capsella bursa-pastoris Moench. R. Pyrus malus L. ? a. T. f. 



Senebiera Coronopus Poir. R. Crataegus oxyacantha L. y. R. 



Raphanus Raphanistrw^n L. T. s. Epilobium sp. R. 



Viola tricolor L. G. Aethusa Cynapium, L. T. s. 



Silene Cucubalus Wibel. a. T. s. Daitcus Carota L. a. T. 



Stellaria media With. R. Galium Aparine L. R. (or T. s.) 



Cerastium glomeratum Thuill. R. Bellis perennis L. R. 



Spergula arvensis L. a. T. s. Helianthus annuus L. ? /3. G. 



Malva rotundifolia L. R. Bidens tripartita L. a. — 



Geranium Robertianum L. R. Chrysanthemum segetum L. T. s. 



Aesculus Hippocastanum L. n. G. Chrysanthemum Parihenium Pes. a. G. 



