Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Hebe rigidula' from the website Trees and Shrubs Online (treesandshrubsonline.
A densely branched shrub to about 2 ft high; branchlets yellow-green with two lines of down on the internodes; leaf-bud with a narrow sinus. Leaves ascending to spreading, up to 1 in. long and 3⁄8 in. wide, elliptic-oblong, acute, green and slightly glossy above, dull green or glaucous beneath, glabrous. Inflorescence branched, not much longer than the leaves, crowded near the tips of the branchlets. Flowers white, sessile; tube about twice as long as calyx. Capsules glabrous.
Native of South Island, commonest in the mountains between Nelson and Blenheim, in rocky habitats. A useful hardy shrub for the rock garden and similar positions, flowering in summer.