Daviesia pedunculata 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

29. Daviesia pedunculata Benth. in Lindley (1839: xiv), Bentham (1864: 74), Crisp (1987a: 252), Crisp (1995: 1220). Type: Swan River, Drummond, 1839. Holotype: K; isotypes: BM, CGE

Spreading or erect shrubs, 0.3–0.6 m high, glabrous to grey-tomentose on branchlets. Root anatomy normal (unistelar). Branchlets terete, ribbed. Phyllodes erect, ovate or elliptic (to narrowly so) or occasionally linear or broad, apically acuminate and usually pungent, marginally undulate and often irregularly shallowly crenulate in the upper half, basally tapered or contracted to a short (1–2 mm) pseudo-petiole, with a thickened articulation at branchlet, (7–)10–28(–37) × 2–11(–16) mm, glabrous or nearly so; lower phyllodes tending to be broad, obovate, crenulate and non-pungent, or even emarginate (e.g. Evans WE 801, Lally 1360). Unit inflorescences 1(2) per axil, condensed racemes or umbels, 3–8-flowered, occasionally terminal (Lally 1360); peduncle 12–25(–75) mm; rachis 0–5 mm long; subtending bracts oblong to triangular, keeled, spreading at the tips, ca. 1–2 mm long; barren bracts oblong to rounded-triangular, occasionally leaf-like (Evans WE 801, Lally 1360), ca. 0.5–1 mm long. Pedicels 2.5– 10 mm long, often shiny and slightly viscid, sometimes with a flange at the apex. Calyx 5–6 mm long including the 1–1.5 mm receptacle; upper 2 lobes united in a broad, truncate lip that may be emarginate, keeled, 2–2.5 mm long; lower 3 lobes triangular, with small calli at the base of each sinus, 1–2.5 mm long. Corolla : standard depressed- or very broad-ovate, emarginate, 7.5–10 × 7–11 mm including the 1.5–2 mm claw, usually with 2 thickened calli at the base of the lamina, yellow with a large circular maroon patch around a central yellow stripe; wings obovate to elliptic with a rounded, incurved apex enclosing the keel, deeply auriculate, saccate, 7–7.5 × 3–4 mm including the 1.5–2.5 mm claw, maroon; keel half transversely elliptic to ovate, acute, saccate, 6–7 × 2–2.5 mm including the 1.5– 2.5 mm claw, maroon. Stamens strongly dimorphic: inner whorl of 5 with longer, slender, terete

78 • Phytotaxa 300 (1) © 2017 Magnolia Press

CRISP ET AL.

A MONOGRAPH OF DAVIESIA

Phytotaxa 300 (1) © 2017 Magnolia Press • 79 filaments and round, versatile anthers with confluent thecae; outer whorl of 5 with shorter, broader, compressed filaments and round, 2-celled, basifixed anthers; filaments free. Pod obliquely shallowly obtriangular, acuminate, ± compressed, 15–18 × 7–9.5 mm; upper suture slightly sigmoid; lower suture scarcely acute to scarcely obtuse. Seed compressed longitudinally, ca. 5 mm long, ca. 3 mm wide, ca. 1.6 mm thick; aril ca. 1.2 mm long. ( Fig. 30 ).

Flowering period:— July to December (in the south). Fruiting period: From October.

Distribution:— Western Australia, in three disjunct areas near Kalbarri, around Eneabba and near Perth. An outlying record from ‘Oldfield River’, on the south coast towards Esperance, requires verification.

Habitat:— Grows on sandy or clay-sand soils in heathland.

Selected specimens (40 examined):— WESTERN AUSTRALIA. Irwin: 16 km N of Hill River bridge along Brand Highway, 30°15’S, 115°26’E, M . D. Crisp 6210, J . Taylor & R . Jackson, 29 September 1979 ( CBG, NSW, PERTH); 32 km W of Arrino , 29°26’S, 115°25’E, C . Chapman (29)76, 31 July 1976 ( AD, CBG, K, MEL, PERTH); 41 km W of Winchester on road to Eneabba , 29°50’S, 115°31’E, C . Chapman (111)77, 23 October 1977 ( CBG, MEL, PERTH); [4.5 km] N of Coorow to Green Head road, on Willis Road , 29°52’S, 116°01’E, C . Chapman (85)77, 18 September 1977 ( CBG, PERTH); Badgingarra National Park, south of Cadda Road , 30°20’S, 115°20’E, N. F . Norris 971, 26 September 1982 ( CANB, HO, MEL); 47 km SE of Kalbarri on Binnu Road West, ca. 4 km W of Yerina Springs road, 28°01’S, 114°17’E, T. R . Lally 640, 3 August 1995 ( CANB, HO, PERTH); Lesueur National Park, western boundary of Vic. Loc. 10641, ca. 500 m S of northern boundary of Lesueur National Park , 30°06’S, 115°13’E, B . Evans WE 801, 24 December 1993 ( PERTH); same area, 30°05’S, 115°13’E, T. R . Lally & B. J . Lepschi TRL 1360, 7 December 1996 ( CANB, PERTH). Darling: Near Midland Junction , 31°53’S, 116°00’E, C. R. P . Andews s.n., October 1902 ( PERTH 5475635 ) .

Affinity:— Daviesia pedunculata is similar to D. lancifolia and D. mollis . Daviesia lancifolia has elliptic to obovate phyllodes which tend to have a truncate apex, the flowers are smaller (e.g. calyx 3–4 mm long, standard 6– 7 mm long) and the pods are smaller (8–9 mm long). Daviesia mollis has broadly obovate or orbicular phyllodes that are often much broader (up to 15 mm broad) than in D. pedunculata ; D. mollis also differs in having phyllodes conspicuously and softly hirsute, and smaller pods (10–11 mm long).

Figures

FIGURE 30. Daviesia pedunculata. A. Flowering branchlet. B. Broader, glabrous phyllode. C. Inflorescence. D. Pod. A from Chapman (85)77; B, C from Crisp 6210; D from Chapman (111)77. Drawn by A.L. Prowse.