THE ALIEN PLANTS OF ESSEX. 33
Barbarea verna Asch. (Europe).—Garden weed, Colchester.
Alyssum incanum L. (Europe, Siberia).—Waste ground,
Hythe Quay, Colchester.
A. maritimum Lam. (Europe).—Waste ground, Abbey Field,
Victoria- Road, Colchester.
Cochlearia Armoracia L. (Europe).—Common on waste land
throughout Essex.
Hesperis matronalis L. (Europe).—Colchester.
Sisymbrium altissimum L. (Europe).—Waste ground, Hythe
Quay and Abbey Field, Colchester
S. orientale L. (Europe, Orient).—Malting refuse, Hythe
Quay, Colchester.
S. austriacum Jacq. Ripple level near Barking Reach,
J. W. Willis, collector.
Erysimum Cheiranthoides L. (Europe, N. America).—In gardens
and allotments, Colchester, etc.
Brassica Cheiranthos Vill. (Western Europe, N. Europe).—
Tilbury, R. Melville, collector.
B. napus L. (cultivated).—Malting refuse, Hythe Quay,
Colchester.
B. Tournefortii Crouan (Mediterranean Region, Orient).—
Malting refuse, Hythe Quay, Colchester.
B. alba Boiss. (Europe, Orient).—Waste ground, Hythe Quay,
Colchester.
B. juncea Coss. (Asia).—Malting refuse, Hythe Quay, Col-
chester. G. C. Druce, collector.
Diplotaxis tenuifolia DC.—Grays, R. Melville, collector.
D. muralis DC.—Waste places, Colchester, Langenhoe, etc. ;
Grays, R. Melville, collector.
Carrichtera annua L. (Spain).—Malting refuse, Hythe Quay,
Colchester.
Lepidium Draba L. (Europe, Orient).—Hythe Quay, Abbey
Field, etc., Colchester; Langenhoe, Peldon, Mersea Island, etc.,
Tilbury, Grays, R. Melville, collector.
L. ruderale L. (Europe, Orient).—Hythe Quay, etc., Col-
chester, Berechurch, Langenhoe, etc.; Tilbury, Grays, R. Melville,
collector.
L. sativum L. (Orient). Malting refuse, Hythe Quay, Col-
chester ; Tolleshunt Knights.