R.S. Cowan & B.R. Maslin, Acacia Miscellany -- 2 
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3. Acacia vincentii Cowan & Maslin, sp. nov. (Figure 1 , T). 
Frulex 3 m altus, ramis longis, arcuatis. Stipulae persistentes, setaceae, connatae basaliter, 2-2.5 
mm longae, glandulari-puberuli sursum. Phyllodia inaequilateraliter oblongo-oblanceolata, apicc 
mucronato-pungenti, circa lateralibus ad axcm longum, 4.5-5 mm longa, 1.5-2 mm lata, ascendentia 
ad erecta, parce puberula. Pedunculi 9-9.5 mm longi, solitarii; capilulae oblongoideae, circa 5.5 
mm diametro, 41-floribus, bractcolis longo-exscrtisin alabaslris maturis. Flores pentamcri, sepalis 
petalis 3/4 longioribus quam 1/2-connata corolla, connatis, lobis linearibus, ciliolalis. Legumen 
anguste oblongum, marginibus crenatis, 25-55 mm longum, 5-10 mm latum, arcuatum, dense 
glandulo-pubcrulum. 
Typus: 6 miles NE of F. B./33 [c. 10 km WSW of Mt Blythe], Edkins Range, West Kimberley 
Region, Western Australia, Aug. 1905, W. V. Fitzgerald 1421 (holo: NSW 104428; iso: NSW, 
PERTH). 
Illustration: L. Pedley, Austrobaileya 2(4): 317, Figure 1 , J, K (1987). 
Shrubs 3 m tall with long, arching branches. Branchlets terete, glandular-puberulous, slender. 
Stipules persistent, setaceous, united basally, often a setaceous lobe on each stipule between 
primary lobes, 2-2.5 mm long, curved upwardly, not rigid, sparingly glandular-puberulous to 
glabrous. Phyllodes inequilaterally oblong-oblanccolale, upper margin conspicuously rounded 
between apex and gland, apex mucronate-pungent and ± perpendicular to long axis of phyllode, 
pulvinus 0.3-0.4 mm long, blades 4.5-5 mm long, 1.5-2 mm wide, coriaceous, ascending to erect, 
sparingly pubcrulous; 2 or 3 nerves on each phyllode face prominulous; gland 1, minute, situated on 
upper margin above middle of phyllode. Peduncles 9-9.5 mm long, solitary, ebracteate throughout, 
puberulous with many hairs gland-tipped; heads oblongoid, c. 5.5 mm diam., 41-flowered; 
bracteoles long-exserled in bud, spathulate with blade lanceolate, acuminate, puberulous and 
ciliolate. Flowers 5-merous. Sepals 3/4 length of petals, 1/2-unitcd, linear lobes and margin of 
basal cup ciliolate. Petals 1/2-united, lobes puberulous. Stamen filaments free. Legumes narrowly 
oblong, not constricted between seeds, one or both margins crcnate, 25-55 mm long, 5-10 mm wide, 
curved, obliquely reticulate transversely, densely glandular puberulous. Seeds (immature) oblique, 
black, shiny; pleurogram U-shaped, 1/2 as long as seed; aril small, apical. 
Distribution. Northern Western Australia in the south-west of the Gardner Botanical District 
(1:250,000 map E51-4). Known only by the type collection from the Edkins Range, West 
Kimberley. 
Habitat. Collected from a sandstone plateau. No other data available. 
Flowering and fruiting periods. Flowering specimens were collected in August along with 
immature legumes. 
Conservation status. IX, using the criteria of Briggs & Leigh (1988) but its status cannot be 
reliably determined until more information is available. 
Affinities. The type collection of A. vincentii has been variously treated: Fitzgerald himself called it 
A. stipulosa on his labels; then Maiden (1920) treated it as A. deltoidea (incorrectly and 
inexplicably, citing April 1905 as the collecting date, although Fitzgerald gave August as the date in 
his field diary), at least partly because he considered A. stipulosa to be conspecific with 
A. deltoidea', finally, Pedley (1987) viewed the material of the new species as an "aberrant 
individual" of A. deltoidea. While related to A. deltoidea, A. adenogonia and A.froggatlii, the new 
species is really quite distinct. Its obliquely transverse seeds and glandular-puberulous vegetative 
parts relate it most closely to A. deltoidea subsp. deltoidea. From all elements of the "A. deltoidea 
group", A. vincentii differs in its setose stipules, the shape and size of the phyllodes, its 
