Daviesia angulata Benth.

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

123. Daviesia angulata Benth. in Lindley (1839: xiv), Crisp (1987a: 248), Crisp (1995: 1169), Wheeler et al. (2002: 744). Type: Swan River, Drummond, 1839. Holotype: K; isotype: G

Dense intricate shrubs, to 1.2 × 2 m, glabrous, occasionally glaucescent. Root anatomy unknown. Branchlets diverging at 30–45°, smooth and angular when fresh, with sharp ridges when dry and sometimes striate between ridges; short axillary shoots with reduced phyllodes sometimes present. Phyllodes diverging at 60–90°, vertically compressed, straight or slightly recurved, subulate (rarely broadest near middle), apically acicular, pungent, sometimes with shallow lateral grooves when fresh, base articulate, 10–35(–40) × 1–4 mm, smooth when fresh, with raised longitudinal nerves when dry. Unit inflorescences 1(2) per axil, racemose, 2–4-flowered; peduncle 2–6 mm long; rachis 1–3.5 mm long; barren basal bracts oblong, ca. 0.5 mm long; subtending bracts oblong to slightly spathulate, may be fimbriate to lacerated at the apex, ca. 0.5–1 mm long. Pedicels 2–7.5 mm long. Calyx campanulate to tapering to the base, 2.5–3 mm long including the 0.75–1 mm receptacle; lobes ca. 0.5 mm long; upper 2 lobes united higher and closer together than the lower 3; lower 3 lobes triangular. Corolla : standard broadly to transversely broadly obovate, with a rounded, slightly emarginate or peaked apex, with 2 small calli on either side of the central groove at the base of the lamina, 6–7 × 5–7.5 mm including the 2–2.5 mm claw, pure yellow with dark red infusion around centre, extending partway along nerves; wings obovate with a rounded apex, strongly auriculate, ca. 7–8 × 3 mm including the 2 mm claw, yellow tinged with red; keel half broadly elliptic, acute, beaked, ca. 8–8.5 × 2 mm including the 3 mm claw, yellow tinged with red. Stamens slightly dimorphic: inner whorl of 5 with slightly longer, angular-terete filaments and shorter, versatile anthers; outer whorl of 5 with slightly shorter, more compressed filaments and longer, basifixed anthers; filaments rigid, cohering; anthers all 2- celled. Pod obliquely very broadly to shallowly obtriangular with an acuminate apex, turgid, 9–16 × 7–8 mm, beaked; upper suture strongly sigmoid to straight and swept upwards; lower suture acute and broadly rounded. Seed obloid, ca. 4 mm long, 2.7 mm broad, 2.7 mm thick, light tan in colour; aril ca. 2 mm long. ( Fig. 124 ).

Flowering period:— March to July. Fruiting period: August to October.

Distribution:— Western Australia, from Eneabba south to Busselton and inland through the eastern wheatbelt from Wongan Hills to Mount Barker.

270 • Phytotaxa 300 (1) © 2017 Magnolia Press

CRISP ET AL.

Habitat:— Occurs on sand or laterite, in jarrah ( Eucalyptus marginata ) forest or mallee-heath.

Selected specimens (79 examined):— WESTERN AUSTRALIA. Irwin: 23 km E of Jurien Bay , 30°14’S, 115°14’E , E. M. Bennett 2931, 21 May 1969 ( CANB, PERTH); E of Cataby Creek on Mimegara Road , 30°47’S ,

A MONOGRAPH OF DAVIESIA

Phytotaxa 300 (1) © 2017 Magnolia Press • 271 115°34’E, R . Hnatiuk 770010, 26 April 1977 ( PERTH); 19 km S of Rail-crossing , ca. 29°27’S, 115°13’E, C . Chapman (65)77, 25 August 1977 ( CBG); 2 km from turnoff near Eneabba settlement, D. Young 86, 15 May 1967 ( PERTH). Avon: 10 km N of Calingiri, 31°05’S, 116°27’E, K. M . Allan 245, 21 May 1970 ( CANB, PERTH) .

Darling: 1 km S of Mogumber , 31°06’S, 116°03’E, C . Chapman (1)77, 28 March 1977 ( CBG); ca . 3 km S of Wannamal , 31°12’S, 116°05’E, C . Chapman (101)77, 17 October 1977 ( CBG); east Bullsbrook , 31°40’S, 116°02’E, R . D. Royce 5835, 1 April 1959 ( PERTH); vicinity 36 mile peg Perth–Moora road, ca. 31°30’S, 116°05’E, C . Chapman (69)77, 1 September 1977 ( CBG). Roe : 12 km W of Lake Grace along the Tarin Rock Road, 33°07’S, 118°21’E, J . Armstrong 5015, 23 May 1983 ( CBG, MEL, PERTH) .

Affinity:— This species has often been confused with D. preissii , but the latter has evenly striate branchlets and phyllodes when dry, a thickened articulation at the base of the phyllode, and lacks the sharp branchlet ridges of D. angulata . Also, D. preissii differs in the inflorescence being 1- or 2-flowered with a shorter peduncle (ca. 1 mm) and the flowers are larger (e.g. standard 7.5–10 × 6.5–8 mm).

Hybrids:— Daviesia angulata × D. polyphylla .

Figures

FIGURE 124. Daviesia angulata. A. Flowering branchlet. B, C. Phyllodes showing variation. D. inflorescence. E. Pod. A, B, D from C. Chapman (1)77; C from Hnatiuk 770090; E from C. Chapman (101)77. Drawn by A.L. Prowse.