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

Family: Labiatae
Prostanthera nudula

Citation: J. Black ex E. Robertson, Fl. S. Aust. 946 (1957).

Synonymy: Not Applicable

Common name: None

Erect to scrambling shrub, 0.5-2 m high; branches striate, glabrous except for a few unicellular and/or multicellular hairs less than 0.1 mm long which are often present at the base of each ultimate branch, sparsely to rarely moderately glandular; ultimate and penultimate branches becoming rigid and spinescent, often defoliated; leaves glabrous, sparsely to moderately glandular; petiole 0.3-0.8 mm long; lamina narrowly elliptic, 3.9-10.5 mm long, 1.3-2.2 mm wide; base obtuse to subattenuate; margin entire, slightly incurred; apex obtuse; venation not visible or indistinct, midrib slightly raised on the abaxial surface.

Pedicel 1.3-2.3 mm long, slender, glabrous or with an occasional multicellular hair, moderately to densely glandular; bracteoles inserted from approximately halfway up the pedicel to near the base of the calyx, narrowly elliptic to narrowly obovate, 1.5-2.4 mm long, 0.3-0.4 mm wide, glabrous, moderately to densely glandular; calyx yellow-green; glabrous except for occasional hairs on the margin of the lobes; hairs less than 0.1 mm long; tube 2.5-3.4 mm; lower lobe very broadly ovate, 3.3-4.7 mm long, 2.6-3.6 mm wide; upper lobe broadly ovate, 5.2-8 mm long, 3.5-5.2 mm wide; corolla 8-11 mm long, a pale cream-colour, base white, inner surface of throat and the base of the lower median lobe with yellow dots, main veins of the tube purple; outer surface moderately hairy on the tube, sparsely glandular; inner surface with a few scattered hairs in the throat particularly at the base of the lateral lobes where moderately hairy; tube 4.7-5 mm long; lower median lobe very broadly ovate, 3-3.5 mm long, c. 4 mm wide; lateral lobes oblong-triangular, c. 3 mm long, c. 2 mm wide; upper median lobe-pair very broadly ovate, 4.2-4.5 mm long, c. 4.4 mm wide; stamens inserted c. 2.5 mm from the base of the corolla; filaments 2.3-3.3 mm long; anthers 1-1.3 mm long, connective extended to form a basal appendage 1.5-1.6 mm long, distal end of appendage with 1-3 triangular trichomes or trichomes absent; pistil c. 8 mm long; ovary 0.5-0.6 mm long, densely glandular distally; style 5.5-6 mm long, with an occasional gland basally; stigma lobes to 0.3 mm long.

Fruiting calyx slightly enlarged; mericarps 2-2.6 mm long.

image of FSA3_Prostanthera_nud.jpg
Image source: fig. 556D in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Distribution:  It occurs amongst granite outcrops usually near watercourses.

S.Aust.: NW.

Conservation status: native

Flowering time: Sept. — Oct.

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

Biology: P. nudula is readily identified by the presence of spines which are formed by the branches becoming rigid and spinescent. Since this species has a very restricted distribution it is likely to be vulnerable.

Author: Not yet available

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