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 source: fig. 556D in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).|
It occurs amongst granite outcrops usually near watercourses.
Flowering time: Sept. — Oct.
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
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.
Not yet available