Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Veronica brachysiphon' from the website Trees and Shrubs Online (treesandshrubsonline.
Taxonomic note V. traversii Hort., not Hook.f.
An evergreen shrub up to 6 ft high, or more, forming a wide-spreading, rounded bush of dense habit; branches erect, at first minutely downy, soon becoming quite glabrous. Leaf-bud with a narrow sinus. Leaves densely arranged on the shoot (ten or twelve to the inch), superposed in four vertical rows; narrowly oval or oblong, sometimes slightly obovate, 1⁄2 to 1 in. long, 1⁄6 to 1⁄4 in. wide, pointed, tapered at the base to a short, broad, hinged stalk, dark, rather dull green. Racemes produced in July from the leaf-axils near the end of the shoot, usually about 3⁄4 in. long, 3 in. wide, the main-stalk minutely downy. Flowers 1⁄4 to 1⁄3 in. in diameter, white. Sepals ovate with minute hairs at the edges. Corolla-tube broad, about twice as long as calyx. Anthers purple-brown. Seed-vessel 1⁄6 in. long, much compressed, about twice as long as the sepals. Bot. Mag., t. 6390.
Native of New Zealand; introduced about 1868. This has proved the most hardy, and on the whole the most ornamental of New Zealand veronicas in gardens. The only time I have seen it killed by cold was in February 1895. It makes a handsome and shapely evergreen, worth growing on that account alone, but it has the additional attraction of flowering freely and regularly after midsummer, when shrubs in flower cease to be abundant. It is pleasing as an isolated specimen on a lawn.