Blackstonia perfoliata
(L.) Huds. Yellow-wortErect glaucous herb, 10–45 cm high. Leaves ovate, 5–25 mm long, 2–20 mm wide, shortly connate at base, basal leaves often clustered. Flowers 1–few, on pedicels 5–30 mm long. Calyx c. 1 cm long; lobes 6–8, subulate, united for 1–2 mm at base; lower part of corolla-tube 2–4 mm long, thinly membranous, enlarging in fruit, corolla-lobes and upper part of tube yellow, distinctly thickened relative to lower tube and together 7–9 mm long; style c. 2 mm long. Capsule ellipsoid, 6–8 mm long, remaining enclosed in enlarged corolla-tube; seeds blackish, reticulate. Flowers Nov.–Feb.
GleP. Also naturalised SA. Native to Europe and Mediterranean area. Known in Victoria by 3 collections from the far south-west where (as in SA occurrences) apparently confined to shallow soils derived from limestone.
Walsh, N.G. (1999). Gentianaceae. In: Walsh, N.G.; Entwisle, T.J., Flora of Victoria Vol. 4, Cornaceae to Asteraceae, pp. 310–321. Inkata Press, Melbourne.