Daviesia incrassata Sm. subsp. teres Crisp (1995: 1203)

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

108c. Daviesia incrassata Sm. subsp. teres Crisp (1995: 1203) . Type: Western Australia, Irwin, 26 miles [41.5 km] W of Coorow , C.H. Gittins 1686, September 1967. Holotype: NSW; isotypes: BRI, CBG

Branchlets strictly terete (even in juvenile plants), gently flexuose. Phyllodes spreading at 45–80(–90)°, strictly terete (even in juvenile plants), mostly 5–10 mm long in the adult plant, up to 8 cm in the juvenile plant. ( Fig. 110F, H ).

Flowering period:— June to September. Fruiting period: August to November.

Distribution:— Western Australia, north of Perth from between Mullewa and Morowa south to Mogumber and inland to the Lake Grace–Kulin region of the wheatbelt.

Habitat:— Grows in sand, sand over limestone or on the edge of saltpans in mallee-heath or kwongan heath.

Selected specimens (30 examined):— WESTERN AUSTRALIA. Irwin: 8 km WSW of Winchester , 29°48’S, 115°52’E, C . Chapman (120)77, 12 November 1977 ( CBG); 16 km from Three Springs on Eneabba Road , 29°37’S, 115°38’E, C . Chapman (73)77, 18 September 1977 ( CBG, PERTH); 21 km W of Arrino , 29°24’S, 115°28’E, C . Chapman (50)77, 21 August 1977 ( CBG, PERTH); 32 km W of Arrino , C . Chapman (54)77, 21 August 1977 ( CBG, MEL); 10 km W of Brand Highway along Green Head Road , 30°05’S, 115°14’E, M . D. Crisp 5427, 24 January 1979 ( CBG); Tompkins Road , 10.2 km W from Natta Road, 40 km due NNW of Eneabba , 29°28’S, 115°23’E, N . Hoyle 151, 10 September 1985 ( CANB, PERTH) .

Affinity:— This subspecies differs from subsp. incrassata by its terete phyllodes and branchlets, both juvenile and adult, and it differs from subsp. reversifolia by its non-reflexed phyllodes and by its terete juvenile phyllodes. In both the other subspecies, the juvenile phyllodes are vertically flattened. Also, the flowers of subsp. teres appear to be slightly larger than in subsp. incrassata , e.g. the standard is ca. 8 mm broad (vs. ca. 7 mm), and the keels are slightly different in shape. However, variation in flowers of subsp. incrassata has not been investigated thoroughly yet.

244 • Phytotaxa 300 (1) © 2017 Magnolia Press

CRISP ET AL.

A MONOGRAPH OF DAVIESIA

Phytotaxa 300 (1) © 2017 Magnolia Press • 245

Subsp. teres may be confused with D. brachyphylla or D. retrorsa but differs from both in having the phyllodes continuous with the branchlet, never articulate at the base. Daviesia brevifolia , which is endemic in eastern Australia, has continuous phyllodes (no articulation), which differ in being constricted on the adaxial side at the base and slightly dilated upwards, especially in juvenile plants.

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.