Wahlenbergia luteola

Perennial with thickened taproot; stems few-many from base, freely branched, sometimes sub-shrubby, wholly glabrous or shortly hirsute near base, erect, to c. 60 (commonly c. 30) cm high, usually leafy for the greater part; leaves opposite throughout or becoming alternate above base, linear (or the lowermost narrowly elliptic or oblanceolate), 5–60 mm long, 1–2(–4) mm wide; margins entire or with a few small callus-teeth. Hypanthium narrow-obconical, 3–7 mm long, glabrous; calyx-lobes erect, narrow-triangular, 3–8.5 mm long, glabrous; corolla (often rather narrowly) campanulate, blue, whitish or often yellowish outside, tube 2–5 mm long, shorter than (rarely to equal) calyx-lobes, lobes elliptic to ovate, 6–14 mm long, 2.5–7.5 mm wide, acute; style 4.5–9 mm long, not or hardly constricted, lobes 3, oblong. Capsule narrowly-obconical, 5–12 mm long, 1.5–3.5 mm wide. Flowers mostly Oct.–Mar.