Perennial; stems ± erect, 1.5–5 dm, retrorsely hispid at the nodes, otherwise glabrous or nearly so; lvs vanilla-scented, mostly in whorls of (6)8(10), oblanceolate or narrowly elliptic, cuspidate, 1.5–5 cm × 4–12 mm, antrorsely scabro-ciliate on the margins and sometimes on the midrib beneath, otherwise glabrous or nearly so; infl terminal, branched, nearly naked; cor white, funnelform, 3–5 mm long and 4–7 mm wide, the lobes somewhat longer than the tube; fr 3 mm, covered with hooked bristles; 2n=22. Woods, native of Europe, sparingly intr. in our range. May, June. (Asperula o.)
A small plant which keeps growing from year to year. It grows 45 cm high and spreads 90 cm wide. The stems are square in cross section. All parts of the plant have an odour. The leaves are narrow and stiff. They are slightly prickly. They are 5 cm long. They occur in neat rings of 6 to 8. The flowers are small and white. They are 35 mm across. They have a sweet scent.