Article from Bean's Trees and Shrubs Hardy in the British Isles
Recommended citation
'Hebe chathamica' from the website Trees and Shrubs Online (treesandshrubsonline.
A prostrate shrub to about 4 ft wide, rooting at the nodes, or trailing down rocks; branchlets slender; leaf-bud without sinus. Leaves tending to lie in one plane, elliptic to obovate-oblong, obtuse or bluntly acute, fleshy, glabrous, dull green, 5⁄8 to 13⁄8 in. long, about 1⁄4 to 1⁄2 in. wide, distinctly stalked. Flowers around midsummer, white or white tinged with violet, in simple compact racemes about 11⁄2 in. long including peduncle. Corolla with spreading lobes.
A native of Chatham Island but, despite that, proving hardy in this country. Laurie Metcalfe recommends it for trailing down walls, especially in seaside localities, and gives a portrait of it in his book on New Zealand trees and shrubs (op. cit., pl. 28).