SOME ESSEX BOTANICAL NOTES
59
impossible to cross the site because of the spiny nature of the plants. The
species still occurs in the same area. Nearby Amaranthus albus L., and Atropa
belladonna L., were growing in quantity. In the following year (1954) in
company with Mr. J. E. Lousley I paid a visit to another Thames-side site at
Hippie Level, Barking. Here we found Hirschfeldia incana (L.) Lagreze-
jFossat., occupying vast areas of the surrounding land and Chenopodium vulvaria
L., occurred on the bank of a dyke. During another visit to the same area
that year Mr. Lousley found Carex divisa Huds., and this plant was still
frequent when I visited the Level in 1956. On a rubbish tip on the Level
on 15th September, 195G, Mr. McClintock, Mr. Lousley and I found
Erucastrum gallicum (Willd.) O. E. Schulz; Berteroa incana (L.) DC
Camelina sativa (L.) Crantz; Chenopodium glaucum L.; Coriandrum sativum
L., which was fruiting freely; Anethum graveolens L.; Cannabis sativa L.;
Centaurea diluta Ait.; together with various species of Oenothera. A large
plant of Datura stramonium in flower and fruit was seen and amongst the
grasses noted were Setaria viridis (L.) Beauv.; S. glauca (L.) Beauv. Panicum
miliaceum L., and Echinochloa crus-galli (L.) Beauv. A little later on the
same day Mr. Lousley found the last-named grass growing in a rhubarb field
at North Ockendon.