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Electronic Flora of South Australia
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Electronic Flora of South Australia species Fact Sheet

Family: Lentibulariaceae
Utricularia australis

Citation: R. Br., Prod. Fl. Nov. Holl. 430 (1810).

Synonymy: Utricularia flexuosa

Common name: Yellow bladderwort.

Suspended aquatic with branched filiform stolons up to 50 cm long; leaves numerous, alternate on the stolons, 1.5-4 cm long, each divided from the base into 2 primary capillary segments, these again repeatedly dichotomously divided into very numerous further capillary segments, the ultimate segments laterally and apically minutely setulose; traps usually present, lateral on the segments, ovoid, 1-2 mm long.

Inflorescence (not seen in S.Aust.) erect, emergent up to 40 cm high; flowers 4-10, alternate; bracts basifixed, orbicular, 3-5 mm long; bracteoles absent; 2 or 3 sterile bracts always present on the peduncle; calyx lobes subequal, ovate-oblong, c. 3 mm long; corolla yellow, c. 15 mm long, the upper lip ovate, the lower lip much larger, orbicular, with a raised gibbous palate; spur broadly conical, obtuse, shorter than the lip.

Capsule and seeds extremely rare.

image of FSA3_Utricularia_aus.jpg Stolon with inflorescence, trap.
Image source: fig. 607A in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Aston (1973) Aquatic plants of Australia, fig. 38; Sainty & Jacobs (1981) Waterplants of New South Wales, pp. 276, 278.

Distribution:  widespread through the temperate and tropical Old World; still water.

S.Aust.: FR, NL, SE.   W.Aust.; N.T.; Qld; N.S.W.; Vic.; Tas.

Conservation status: native

Flowering time: Flowers (in Vic.): Nov. — April.

SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia

Biology: No text

Author: Not yet available

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