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

Family: Labiatae
Prostanthera striatiflora

Citation: F. Muell., Linnaea 25:425 (1853).

Synonymy: Prostanthera striatiflora

Common name: Jockeys cap, striated (or striped) mintbush.

Erect shrub, 0.2-2 m high; branches very sparsely to sparsely hairy or glabrous; hairs straight to curled, subpatent to antrorse, 0.1-0.2 mm long; very sparsely to sparsely glandular; leaves light- to dark-green, usually dull, glabrous, rarely with an occasional hair, moderately glandular; petiole absent or to c. 1 mm long; lamina narrowly ovate to narrowly elliptic, rarely very narrowly elliptic, 4-38 but usually 8-30 mm long, 1.5-10 mm wide; base acute to subattenuate, often subdecurrent; margin entire; apex acute to obtuse; venation not visible; midrib faint and slightly raised on the abaxial surface.

Pedicel 1.3-2.3 mm long, glabrous, glands absent or moderately glandular; bracteoles usually inserted on the distal third of the pedicel, narrowly ovate or narrowly elliptic to linear, 2.1-6 mm long, 0.3-0.9 mm wide, glabrous or sometimes with an occasional hair, glands absent; calyx light-green, usually with a faint purple tinge above, glabrous, glands absent; tube 2.5-3.4 mm long; lower lobe very broadly to broadly ovate, 2:5-3.9 mm long, 2.3-3.9 mm wide; upper lobe broadly ovate to ovate, 4.6-6.6 mm long, 3-5.2 mm wide; corolla 10-17 mm long, white, inner upper and lateral surfaces of the tube with purple lines present, inner lower surface of tube white with dull-orange to yellow dots or yellow-orange lines often present also; outer surface glabrous basally, sparsely to moderately hairy with hairs 0.1-0.2 mm long on the lobes and distal part of the tube, sparsely glandular; inner surface glabrous in the tube and sparsely hairy on the lobes, glands scattered; tube 10.3-11.4 mm long; lower median lobe spathulate, 6.5-9.8 mm long, 8.5-9.1 mm wide; lateral lobes broadly elliptic to elliptic or broadly oblong, 5.2-8.5 mm long, 4.6-5.6 mm wide; upper median lobe-pair depressed- to very broad-ovate, 5.5-10.4 mm long, 8.5-13.8 mm wide; stamens inserted 3.3-3.7 mm above the base of the corolla; filaments 3-5.2 mm long; anthers 1-1.3 mm long, not crested, connective extended to form a basal appendage 2.3-2.9 mm long, terminating in 1-3 narrowly triangular trichomes; pistil 10.7-13 mm long; ovary more or less cylindrical to cup-shaped, c. 0.5 mm long, densely glandular distally; style 10-11 mm long; stigma lobes 0.2-0.6 mm long.

Fruiting calyx enlarged; mericarps 2-2.5 mm long.

image of FSA3_Prostanthera_str.jpg
Image source: fig. 556G in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Althofer (1978) Cradle of incense, p. 96; Cunningham et al. (1982) Plants of western New South Wales, p. 580.

Distribution:  This species commonly occurs in skeletal soils of rocky areas in open woodland communities associated with various species of Acacia, Callitris, Cassia and Eremophila.

S.Aust.: NW, LE, GT, FR, EA, EP, NL, MU.   W.Aust.; N.T.; N.S.W.

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: No text

Author: Not yet available

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