Daviesia grahamii Ewart & J.White

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

41. Daviesia grahamii Ewart & J.White in Ewart et al. (1909: 12), Crisp (1981: 149), Crisp (1991a: 264), Crisp (1995: 119). Type: ‘Jibberding and Watheroo Rabbit Fence, West Australia, M. Koch, 1905, No. 1365.’ Lectotype ( Crisp 1991a: 264): Jibberding, M. Koch, October 1905 (MEL 78090); isolectotype: MEL 78092, NSW 34935 & 34956; syntype: Watheroo Rabbit Fence, M. Koch, September 1905 (MEL 78091); isosyntype: AD, K (2 sheets), P, PERTH

Daviesia phyllodinea Moore (1920: 168) . Type: Western Australia, Belka, F. Stoward 352, 1917. Holotype: BM.

Intricate, many-stemmed shrubs, 0.2–0.5(–0.7) m high and 1 m broad, appearing glabrous but minutely scabrous. Root anatomy normal (unistelar). Branchlets ascending, angular, ribbed. Phyllodes scattered, erect, narrowly obovate, oblong or elliptic to linear, obtuse to acute at apex, apiculate with a hard point but not or scarcely pungent, slightly recurved at margins, tapered to the articulate base, 0–50(–80) × 0–3(–8) mm, rigid, dull green to yellow-green; venation prominent, especially midrib and 2 longitudinal intramarginal veins (in broader phyllodes, anastomosing lateral veins are also visible); phyllodes reduced, sometimes to scales, towards branchlet apex; stipules present, erect to recurved, subulate, 0.6–1.1 mm long. Unit inflorescences 1–4 per axil, 1–(2)-flowered, appearing sessile; peduncle 0.8–2.5 mm long; subtending bracts erect to spreading at 45°, narrowly obovate-oblong or linear, fimbriate, with slightly incurved margins, ca. 1.5 mm long. Pedicels 1.4–3.2 mm long. Calyx 3.0– 3.5 mm long including the 0.8–1.1 mm receptacle to which it is contracted, lightly 5-ribbed, variably tinged purple, especially on ribs, apices and sinuses; lobes acuminate or apiculate; upper 2 broadly to shallowly triangular, united scarcely to distinctly higher than lower 3, 0.75–1.5 mm long; lower 3 lobes broadly triangular, 0.5–1 mm long. Corolla : standard depressed-ovate or transversely elliptic, emarginate, 7–8 × 7.5–8.5 mm including the 1.5–3 mm claw, richly yellow to orange-yellow, infused with dark red around the oblong yellow centre; wings obovate-

A MONOGRAPH OF DAVIESIA

Phytotaxa 300 (1) © 2017 Magnolia Press • 99 oblong, angled upward, rounded and slightly overlapping at apex, auriculate, 6–7 × 2–2.25 mm including the 2–2.5 mm claw, dark red with yellow or orange tips; keel half broadly obovate to depressed-obovate, acute to scarcely obtuse, saccate, auriculate, 5–6 × 2–2.5 mm including the ca. 2 mm claw, maroon. Stamens strongly dimorphic:

100 • Phytotaxa 300 (1) © 2017 Magnolia Press

CRISP ET AL.

inner whorl of 5 with longer, slender, angular filaments and discoid, versatile anthers with confluent thecae; outer whorl of 5 with shorter, broader, compressed filaments and compressed, ovoid to obloid, basifixed, 2-celled anthers; filaments free, adaxial 3 dilated towards apex. Pod obliquely very broadly obtriangular, obtuse, very compressed, 6–8 × 4–6 mm, conspicuously reticulate, speckled with purple when immature, straw-coloured at maturity; upper suture strongly sigmoid; lower suture acute. Seed not seen. ( Fig. 40 ).

Chromosome number:— 2n = 18; voucher Sands 639.1.6 ( Sands 1975).

Flowering period:— July (in north) to October (in south). Fruiting period: From November.

Distribution:— Western Australia, widespread in the interior, from the Little Sandy Desert southward to the eastern margins of the wheatbelt. The occurrence in the Townsend Ridges, near Warburton, suggests that this species may eventually be found in South Australia or the Northern Territory.

Habitat:— In the arid zone, this species grows in deep red sand with spinifex ( Triodia ) hummock-grassland. In semi-arid country farther west and south, it occurs in sand or clayey sand (more yellow than red), with tall shrubby vegetation dominated by genera such as Acacia , Allocasuarina , mallee eucalypts, Grevillea , Hakea and Triodia .

Selected specimens (41 examined):— WESTERN AUSTRALIA. Avon: Pindar , 28°29’S, 115°47’E, W. E . Blackall 649, 14 September 1931 (2 sheets in PERTH); Totadgin, 31°35’S, 118°12’E, Wilson & Herbert s.n., November 1920 ( PERTH 2727358 ). Austin : 29 km E of Sandstone, 28°15’S, 119°19’E, A. S . George 8008 p.p., 13 September 1966 ( CANB, MO, NSW, PERTH); 21 km NW of Albion Downs Woolshed , 27°10’S, 120°14’E, N. H . Speck 1473, 17 September 1958 ( CANB, PERTH); 5 km W of Paynes Find , 29°16’S, 117°38’E, P. G . Wilson 8644, 7 August 1969 ( AD, CANB, DNA, MEL, PERTH). Coolgardie : 32 km E of Southern Cross, 31°18’S, 119°39’E, M . D. Crisp 5573, 30 January 1979 ( CBG, PERTH); near Queen Victoria Rock , 31°19’S, 120°55’E, M . D. Crisp 5904 et al., 18 September 1979 ( CBG, MEL, PERTH); 17 km N of Bullfinch on road to Mount Jackson , 30°49’S, 119°06’E, V. E . Sands 639.1.6, 3 September 1963 ( PERTH, SYD). Helms: Townsend Ridges , NE of Laverton, 26°20’S, 127°00’E, C . de Clarke 137, July 1916 ( PERTH); 30 km NE of Laverton , 28°21’S, 122°36’E, A. C . Beauglehole 59830 & E. G . Errey 3530, 16 September 1978 (Herb. Beauglehole, BISH, CANB, L, LTB, MEL, NSW, PERTH). Keartland: Little Sandy Desert. 27.2 km ESE of East Kulonoski Well, 24º42’S, 120º27’E, S. van Leeuwen 5175, 8 September 2002 ( CANB, PERTH) .

Affinity:— Daviesia grahamii is diagnosed from its close relatives by its relatively conspicuous stipules (0.6– 1 mm long), which are longer than in other species in the genus, except D. pachyloma . However, D. pachyloma differs markedly in multiple characters, most obviously its differently shaped phyllodes and terminal racemes. Both D. leptophylla and D. newbeyi are closely related to D. grahamii , especially the latter. Daviesia newbeyi may be distinguished by its lack of obvious stipules (present but <1 mm long) and longer calyces (4.8–5.6 mm long including the receptacle) with the upper 2 lobes united into a truncate lip. Daviesia leptophylla differs by its lack of obvious stipules (present but <0.5 mm long), several flowers per unit inflorescence and non-acuminate calyx-lobes.

Figures

FIGURE 40. Daviesia grahamii. A. Flowering branchlet. B. Phyllode with minute stipules. C, D. Inflorescences (1-flowered). E. Calyx opened out, upper lobes at left. F. Standard. G. Wings. H. Keel. I. Same, opened out. J. Pod. A, C–J from Crisp 5905; B. from Beauglehole 59830. Drawn by A.L. Prowse and D. Fortescue. Adapted from Crisp (1991a) with permission from CSIRO Publishing.