Excerpt from The Adventive Flora of Tweedside
The adventitious or alien flora of Tweedside is so interesting and in extent so exceptional that no apology need be made for placing on record the results of the investigations of my colleague, Miss I. M. Hayward. Investigations of great value in themselves, they are of recognised importance in confirming and extending our knowledge of plant distribution.
This adventitious flora is intimately connected with the staple trade of Galashiels, around which the investigations have been made, and where Miss Hayward found ample scope for her botanical researches. Her present work was aided and supported by her uncles, the Messrs Sanderson. Engaged in the woollen industry, they gave her ready access to the mills and the various processes which ultimately released the seeds from their resting place. Advancing times have brought about changes, and the number of aliens is no longer likely to increase. In former times at Galashiels the effluents from the woollen mills carrying seeds washed out in the course of scouring found their way into the river, but in recent years a system of drainage has been introduced whereby these impure waters are intercepted and conducted into septic tanks, where, under drastic treatment, all or nearly all the seeds present are destroyed. In the near future, therefore, instead of a large alien flora appearing along the rivers only a few sporadic species can be expected to occur, and further waiting would add little to the book now published.
For assistance in determining the very difficult plants we are especially indebted to Dr Albert Thellung of Zurich, the accomplished author of the classic, "La Flore Adventice de Montpellier"; to Dr Murr, the well-known authority on the Chenopodiaceae; and to Prof. E. Hackel, the great Austrian authority on the Graminaceae.
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