THE PRESENT FLORA OF WEST HAM WASTES. 181
clump of what apparently was this plant grew on the further
bank of the Three Mills Wall stream, in an inaccessible position.
Lemna minor L. Small Duckweed. A, B. In streams, and
on reservoirs of the West Ham Gas Works.
L. trisulca L. Ivy-leaved Duckweed. B. In Pudding Mill
Stream.
Potamogeton pectinatus L. Fennel-leaved Pondweed. B.
In Pudding Mill Stream which is in part being filled in.
Phalaris canariensis L. Canary Grass. B. One plant. A
Mediterranean species, often distributed with bird-food.
Alopecurus agrestis L. Field Fox-tail. B. One plant.
Phleum pratense L. Timothy Grass. A. Half a dozen
plants. F.
Agrostis alba L. White Bent-grass. B. Abundant in some
places, and growing two feet high.
Holcus lanatus L. Yorkshire Fog. B. A few plants.
Avena sativa L. Oats. B. Several plants. F.
Arrhenatherum elatius M. and K. False Oat. B. A score of
plants. F.
Phragmites communis Trin. Reed. A. Abundant by the
New Flood Channel.
Dactylis glomerata L. Cock's Foot. A, B. Abundant. F.
Poa annua L. Annual Meadow Grass. A, B. Very abun-
dant. F.
Lolium perenne L. Rye Grass. A, B. Very abundant. F.
Agropyrum repens Beauv. Twitch. A, B. Very abundant.
Hordeum murinum L. Wall Barley. A, B. Very abundant.
H. vulgare L. Barley. B. A few plants.
Triticum aestivum L. Wheat. B. A few plants.
In reviewing this list of October plants, we realise that had our
expeditions been taken earlier in the year the number would
probably have been considerably larger. Of the 104 species
enumerated, one is characteristic of saltings; 16 are water or
waterside plants, most of which have corky fruits enabling
them to float as drift along the streams ; 7 species are more or
less garden escapes; 19 species of the land plants have feathery
fruits or seeds which facilitate their transport by the wind. The
Family Compositae far outnumbers any others, a usual pre-
ponderance in the second half of the year. It is represented by
27 species ; of these 11 species have fruits with no pappus of any