Daviesia incrassata Sm. subsp. reversifolia (F.Muell.) Crisp (1995: 1201)

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

108b. Daviesia incrassata Sm. subsp. reversifolia (F.Muell.) Crisp (1995: 1201) . Daviesia reversifolia Mueller (1859: 145) , Bentham (1864: 83). Type : ‘ In monte ‘ Flat-top Hill’ juxta rivum Fitzgerald River. Mxw.’ Holotype: MEL 80382 ; isotypes: K,? MEL 80383

Branchlets terete, strongly flexuose. Phyllodes reflexed or spreading at 90°, terete, mostly 5–15 mm long in the adult plant. Juvenile phyllodes not retrorse, gently incurved, vertically compressed but not lobed, up to 8 cm long. ( Fig. 110A–C ).

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

Distribution:— This subspecies extends along the south coast and adjacent hinterland of Western Australia from Bremer Bay to Esperance. A specimen from Kangaroo Island, South Australia (Tate s.n., AD 968010180) definitely belongs to this taxon. However, the locality requires verification, given the lack of precise locality details and a large disjunction from the nearest occurrence in WA.

Habitat:— Grows in sand or rocky soil in mallee-heath or kwongan heath.

Selected specimens (59 examined):— WESTERN AUSTRALIA. Roe: East of Jerramungup , C. E . Woolcock D 45, 31 July 1981 ( CBG). Eyre: 404 mile-[post], Esperance – Ravensthorpe Road, 33°43’S, 120°58’E, E. M . Bennett 919, 11 September 1966 ( PERTH); 1 km E of Lort River, on Ravensthorpe–Esperance road, 33°45’S, 121°16’E, E. M . Canning WA/68 7202, 5 November 1968 ( CBG); 80 km W of Esperance , 33°47’S, 121°05’E, R . D. Royce 3642, 12 August 1951 ( PERTH); 56 km W of Esperance towards Ravensthorpe , 33°44’S, 121°20’E, J. H . Willis s.n., 2 September 1947 ( MEL 80386 ); 80 km W of Esperance towards Ravensthorpe, 33°47’S, 121°05’E, P. G . Wilson 7830, 25 September 1968 ( CANB, PERTH); 100 km from Esperance along road to Ravensthorpe , 6 km E of Munglinup River crossing, 33°43’S, 120°56’E, M . D. Crisp 4931, 8 January 1979 ( CBG, PERTH); 26 km E of Hopetoun , 33°57’S, 120°24’E, M. E . Phillips 3055, 2 November 1962 ( CBG) .

Affinity:— This subspecies is easily distinguished from the others by its very tangled, intricate habit, zigzag branchlets and patent to strongly reflexed phyllodes. Around the distributional limits of subsp. reversifolia , occasional intermediates with subsp. incrassata are found, e.g. Crisp 5095 ( Fig. 110D, E ).

Figures

FIGURE 110. Daviesia incrassata subsp. reversifolia. A. Adult fruiting branchlet. B. Flowering branchlet showing developmental sequence of phyllodes from base (juveniles) to tip (adults). C. Juvenile phyllode enlarged. Intermediate between D. incrassata subsp. reversifolia and subsp. incrassata. D. Adult branchlet. E. Juvenile phyllode showing vertical dilation. Daviesia incrassata subsp. teres. F. Flowering adult branchlet. G. Juvenile branchlet. H. Pod. A from Crisp 4931; B, C from Bennett 919; D, E from Crisp 5095; F from Gittins 1686 (type); G from Crisp 5427; H from Chapman (108)77. Drawn by A.L. Prowse. Adapted from Crisp (1995) with permission from CSIRO Publishing.