The Canada Rock Elm (Ulmus racemosa) is grown in North America, and imported chiefly from Canada.
The wood is of a whitish-brown colour, with very close annual rings. It is very tough, flexible, free from knots and sap, with a fine smooth grain, durable under water, but liable to shrink and warp unless kept immersed, and to shakes if exposed to the sun and wind.
Being flexible, it is used for boat building, also, on account of its clean appearance, for ladder steps, gratings, etc., on board ship.1
The sap is not durable like that of common elm, but subject to decay.
In selecting this wood only those logs should be taken which have an uniform whitish colour, any with dark annular layers full of moisture being left for inferior purposes.1