Daviesia uniflora Herbert (1922: 37)

Crisp, Michael D., Cayzer, Lindy, Chandler, Gregory T. & Cook, Lyn G., 2017, A monograph of Daviesia (Mirbelieae, Faboideae, Fabaceae), Phytotaxa 300 (1), pp. 448-450 : 448-450

34. Daviesia uniflora Herbert (1922: 37) , Crisp (1995: 1244). Type: ‘ Locality-Yoting, in sand plain. Collectors — Herbert & Wilson No. 174. Date — November, 1920.’ Lectotype (Crisp 1995: 1244): PERTH; isolectotype: MEL 80533

Spreading or decumbent shrubs to 0.7 m high × 4 m broad, densely hispid on branchlets, hispidulous on margins and midribs of phyllodes, rarely also on the surface. Root anatomy normal (unistelar). Branchlets terete, obscurely ribbed. Phyllodes crowded and overlapping, appressed or steeply ascending, (narrow-) obovate with a cuspidate, pungent, recurved to reflexed apex, tapered or contracted to a short pseudo-petiole, inarticulate with branchlet, 7– 13 × 3–8 mm; abaxial midrib prominent, venation obscure. Unit inflorescences solitary in the axils, 1-flowered; peduncle 8–12 mm long, glabrous to hispidulous, usually viscid, rarely flexuose (e.g. Crisp 9362); subtending bracts narrowly oblong to linear-canaliculate, ca. 1–1.5(–3) mm long; barren bracts several along peduncle. Pedicels glabrous, 4–8 mm long, viscid. Calyx 5–6 mm including the ca. 1.5 mm receptacle; upper 2 lobes united in a truncate lip with recurved lobes, ca. 1–1.5 mm long; lower 3 lobes triangular, ca. 1 mm long. Corolla : standard broadly ovate with a rounded, apiculate apex, 10–15 × 10–14 mm including the 2–3 mm claw, pale yellow with a purplish infusion towards the central rich yellow marking; wings obliquely elliptic with rounded, slightly incurved apices that partially enclose the keel, strongly auriculate, 9–12 × 4–5 mm including the 3–4 mm claw, purple; keel half transversely narrowly ovate, acute, auriculate, saccate, 13–15 × 2–3 mm including the 6–7 mm claw, purple. Stamens strongly dimorphic: inner whorl of 5 with much longer, slender, terete filaments and shorter, rounder, versatile anthers with confluent thecae; outer whorl of 5 with much shorter, broader, compressed filaments and longer, slender, basifixed, 2-celled anthers; filaments free. Pod oblique, broadly to very broadly obtriangular, acuminate, somewhat turgid, 10–15 × 9–13 mm. Seed globoid, 3–4 mm long, 2–3 mm wide, ca. 2 mm thick, light to dark brown; aril 1.5–2 mm long. ( Fig. 35 ).

Flowering period:— July to November. Fruiting period: October and November.

Distribution:— Western Australia, south-central wheatbelt, from near Kojonup east to near Ravensthorpe and north to the Great Eastern Highway.

Habitat:— Grows in gravelly or loamy sand on sandplains. The vegetation is predominantly kwongan, with Eucalyptus and Allocasuarina the dominant overstorey genera, and Banksia and Grevillea common in the understorey.

Selected specimens (32 examined):— WESTERN AUSTRALIA. Roe: 5 km N of Nyabing , 33°30’S, 118°09’E, M . D. Crisp 6143, 26 September 1979 ( AD, CBG, PERTH); 21 km W of Lake Grace , 33°06’S, 118°15’E, W. E . Blackall 1308, 11 November 1931 ( PERTH); 20.5 km E of Newdegate along road to Lake King , 33°05’S, 119°13’E, M . D. Crisp 9362, 7 October 2001 ( CANB, PERTH). Avon : 5 km W of Corrigin, 32°20’S, 117°50’E, M . D. Crisp 6171 et al., 26 September 1979 ( CBG, NSW, PERTH); 10 km N of Bendering , 32°13’S, 118°20’E, C. A . Gardner 9448, 18 October 1949 ( PERTH) .

Affinity:— In D. uniflora , the standard is not emarginate at the apex; rather, it has a small apiculum, which appears to be unique in the genus. Daviesia cardiophylla is similar in appearance but is easily distinguished by its emarginate standard, cordate-ovate phyllodes with straight tips, sessile inflorescence (with no peduncle), and a smaller standard (9–10 mm long) with distinct calli at the base.

A MONOGRAPH OF DAVIESIA

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CRISP ET AL.

Figures

FIGURE 35. Daviesia uniflora. A. Flowering branchlet. B. Inflorescence (1-flowered). C, D. Pods, showing variation. A, B from Crisp 6143; C from Blackall 1308; D from Gardner 9448. Drawn by A.L. Prowse.