Wahlenbergia stricta subsp. stricta

Perennial with thickened taproot; stems few-many (sometimes single) from base, usually few-branched (sometimes many-branched or simple), usually hirsute at least in lower part, rarely quite glabrous, erect or sprawling, to 45(–90) cm high, often leafless in upper half; leaves opposite throughout or alternate in upper part, obovate to ovate or narrowly so, sometimes linear near inflorescence, 5–70 mm long, 1–13 mm wide; margins usually undulate or crenate, usually with small callus-teeth. Hypanthium barrel-shaped to obconical, 2–4 mm long, glabrous or sparsely hirsute; calyx-lobes erect or weakly spreading, narrow-triangular, 3–8.5 mm long, glabrous or sparsely hirsute; corolla campanulate, blue to deep mauve, often whitish (rarely yellowish) outside, tube 4–11 mm long, shorter or longer than calyx-lobes, lobes elliptic to ovate, 6–20 mm long, 2.5–12 mm wide, acute; style 5.5–13 mm long, not or hardly constricted, lobes 3, oblong. Capsule barrel-shaped, obovoid or globoid, 3–10 mm long, 2.5–8 mm wide.  Flowers mostly Oct.–Jan.