Daviesia crenulata Turczaninow (1853: 265)

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

24. Daviesia crenulata Turczaninow (1853: 265) , Bentham (1864: 72), Crisp (1995: 1185). Type: ‘Drum. V. n. 40.’ Holotype: KW; isotypes: BM, G (2 sheets), K (2 sheets), MEL, P, RI, W

Daviesia calystegia Turczaninow (1853: 264) . Type: ‘ Drum. IV. n. 30.’ Holotype: KW; isotypes: MB, FI-W, G (2 sheets), K (3 sheets), MEL, OXF, P (2 sheets), W.

Daviesia parifolia Mueller (1863: 16) . Type: ‘In collibus glareosis Kojonurup dictis. Maxw.’ Holotype: MEL.

Bushy shrubs, to 0.8 m high, hirsute or shortly so, mainly on branchlets. Root anatomy unknown. Branchlets spreading to ascending, terete, prominently ribbed. Phyllodes scattered to opposite, spreading, ovate, broadly ovate or transversely broadly ovate, 15–31 × 14–35 mm; apex acute or acuminate and ± pungent; margins usually deeply crenulate; base truncate or slightly cordate with a short (1–2 mm) pseudo-petiole, articulated at the thickened node,

A MONOGRAPH OF DAVIESIA

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CRISP ET AL.

shortly decurrent; lamina glabrous except occasionally a few short hairs along the veins towards the base; venation prominently reticulate. Unit inflorescences 1 per axil, umbellate, 2–4-flowered; peduncle 17–55 mm long, with a pair of circular, herbaceous involucral bracts at the summit, these 3–5 mm broad, becoming scarious and enlarging to ca. 20 mm broad and enclosing pod, venation prominently reticulate; subtending bracts spreading, oblong, ca. 1 mm long; barren bracts scattered along peduncle, appressed to ascending, oblong, ca. 1 mm long. Pedicel 2.5–3.5 mm long. Calyx 4.5–5.5 mm long including the 1–1.5 mm receptacle; upper 2 lobes united in a truncate, deeply emarginate lip, apex acuminate, ca. 1.5 mm long; lower 3 lobes triangular, ca. 1 mm long. Corolla : standard transversely elliptic, emarginate, 7–8.5 × 10–11.5 mm including the 2–2.5 mm claw, yellow to orange with a maroon infusion around the yellow centre; wings elliptic with a rounded apex, auriculate, 6–6.5 × 2–2.5 mm including the 2.5 mm claw, maroon; keel half transversely elliptic, scarcely acute, inflated, saccate, 5.5 × 2.5 mm including the 2 mm claw. Stamens moderately dimorphic: inner whorl of 5 with longer, slender filaments and rounder anthers with confluent thecae; outer whorl of 5 with shorter, broader, compressed filaments and oblong, 2- celled anthers; filaments all compressed; cohering. Pod obliquely shallowly to very broadly obtriangular, apex acute, 10–11 × 7–9 mm; upper suture sigmoid; lower suture acute. Seed ellipsoid, ca. 4 mm long, 3 mm broad, 2.5 mm thick, brown to black; aril ca. 2.5 mm long. ( Fig. 25 ).

Flowering period:— September and October. Fruiting period: October and November.

Distribution:— Western Australia, throughout the Stirling Range and an isolated record from near Tunney, between Cranbrook and Kojonup.

Habitat:— Grows in gravelly or rocky sandy loam on hillsides in heath, mallee–heath or forest dominated Eucalyptus .

Selected specimens (27 examined):— WESTERN AUSTRALIA. Eyre: Mt Mistake , Stirling Range, 34°30’S, 118°00’E, E. C . Nelson 17388, 25 September 1973 ( CANB, PERTH); Red Gum Springs, Stirling Range National Park , 34°22’S, 117°45’E, J. W . Wrigley WA/68 4358, 10 October 1968 ( CBG); 4 km W of Tunney , 34°07’S, 117°22’E, W. J . Whittaker s.n., October 1968 ( PERTH 5209986 ); N side of Bluff Knoll, Stirling Range, 34°22’S, 118°15’E, A. S . George 3110, 12 November 1961 ( PERTH); 2 km S of Wedge Hill, Stirling Range , 34°26’S, 118°10’E, M . D. Crisp 6125 et al., 25 September 1979 ( CBG, K, PERTH); Stirling Range, junction of East Pillenorup and South Bluff Tracks , 34°25’S, 118°15’E, M . D. Crisp 5261, 18 January 1979 ( CBG) .

Affinity:— Daviesia crenulata is distinguished from most other species that have a conspicuous, accrescent involucre at the base of the inflorescence ( D. alternifolia , D. elongata , D. oppositifolia and D. ovata ) by its crenulate, slightly cordate phyllodes with acuminate, often pungent leaf tips. The remaining species in this group, D. cordata , is distinguished by its long, tapering, non-pungent phyllodes that are at least 2 × longer than broad, with deeply cordate, stem-clasping bases.

Figures

FIGURE 25. Daviesia crenulata. A. Flowering branchlet. B. Infructescence with proximal involucral bract removed. C. Pod. A from Nelson 17388; B from Crisp 5261; C from George 3110. Drawn by B-J. Osborne.