Daviesia decipiens (E.Pritz.) Crisp (1995: 1185)

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

99. Daviesia decipiens (E.Pritz.) Crisp (1995: 1185) . Daviesia pectinata Lindl. in Mitchell (1838: 150) var. decipiens E.Pritz. in Diels & E. Pritzel (1904: 250). Type: ‘Hab. in distr. Eyre pr. Philipps Riv. (D. 3488)’ (B†). The type is missing, presumably destroyed in the Berlin herbarium during the Second World War ( Hiepko 1987). Neotype (Crisp 1995: 1185): Western Australia, 3 km WNW of Cape Riche, 34°36’S, 118°45’E, M.D. Crisp 5104, 14 Jan 1979 (CBG); isoneotype: K, PERTH

Variable, intricate shrubs, to 1.8 m high, glabrous. Root anatomy with anomalous secondary thickening (cord type). Branchlets flexuose, triquetrous, broadly to narrowly winged or ribbed with decurrent phyllode-bases, 1.5–10 mm broad. Phyllodes scattered, spreading or somewhat recurved, vertically compressed to dilated, oblong or deltoid or subulate, tapered to the acuminate apex, pungent, with a broad, decurrent base (rarely not apparent), 5–25 mm long, (1) 2–8 mm broad at the base, with a single nerve near the upper margin, smooth when fresh and wrinkled when dry. Unit inflorescences 1 per axil, racemose, 1 or 2(3)-flowered; peduncle flexuose, 1–2.5 mm long; rachis flexuose, 0.5–2 mm long; subtending bracts ascending, oblong to rhombic, keeled, decurrent with rachis or peduncle, to 0.5 mm long. Pedicels 0.75–1.5 mm long. Calyx 3–4 mm long including the ca. 0.5–1.75 mm receptacle, truncate at base; lobes very broad and short; upper 2 lobes united into a broad, truncate lip, ca. 0.75 mm long; lower 3 lobes triangular, flared from just below lobes, ca. 0.25 mm long; receptacle greater in diameter than pedicel. Corolla : standard transversely elliptic to broadly so, emarginate, 5–6.5 × 5.5–8 mm including the 1.5–2 mm claw, with 2 small calli just above the base of the lamina, orange with maroon markings; wings obovate with

224 • Phytotaxa 300 (1) © 2017 Magnolia Press

CRISP ET AL.

divergent lower margins, very obtuse, apex rounded, slightly incurved but not enclosing the keel, auriculate, with a small lobe opposite the auricle on the abaxial margin, saccate, 4.5–5 × 2–2.75 mm including the 1.5–1.75 mm claw, red; keel half transversely broadly elliptic, constricted to a short beak, incurved, auriculate, saccate, rugose abaxially, 4–5 × 1.5–2 mm including the 1.5–2 mm claw, crimson. Stamens strongly dimorphic: inner whorl of 5 with longer filaments and very small, dorsifixed anthers and confluent thecae; outer whorl of 5 with shorter filaments and longish, 2-celled anthers; filaments free, successively broader from keel towards standard, those two

A MONOGRAPH OF DAVIESIA

Phytotaxa 300 (1) © 2017 Magnolia Press • 225 nearest the standard upwardly dilated; vexillary stamen (inner whorl) with filament broad, channelled, clasping the ovary and style, flared into a pedestal at apex. Pods obliquely very broadly to shallowly obtriangular, turgid, thick-walled, ± obtuse, 11–12 × 8–11 mm; evenly red-brown or purplish; upper suture straight to curving upwards; lower suture acute. Seed not seen. ( Fig. 100 ).

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

Distribution:— Western Australia, from Chidlow (east of Perth) south through Narrogin to Cape Riche and Kalgan and east through the Stirling Range to near Ravensthope.

Habitat:— Grows in a range of soil types, from sand over granite or laterite to clay (sometimes gravelly) in Eucalyptus -dominated woodland or mallee, or kwongan heathland.

Selected specimens (35 examined):— WESTERN AUSTRALIA. Avon: Kojonup 6182, Nyabing , V. F . McDougall 3, 1 August 1955 ( CANB, PERTH); Timber Reserve 20802, near Cuballing , 32°49’S, 117°11’E, G . Durell s.n., 21 September 1988 ( CANB 8803137 ). Roe : 5 km N of Nyabing, 33°30’S, 118°09’E, M . D. Crisp 6144, et al., 26 September 1979 ( CBG, PERTH); Jerramungup , 33°57’S, 118°55’E, C. E . Woolcock D 63, 31 July 1981 ( CBG). Eyre: Pallinup River crossing, Mara Bridge , between Albany and Jerramungup , 34°24’S, 118°44’E, E. M . Canning s.n., 9 November 1968 ( CBG 36911 ); Cape Riche, 34°36’S, 118°46’E, C. A . Gardner 6532, 12 October 1942 ( PERTH); Paper Collar Gully, Chester Pass, Stirling Range , 34°19’S, 118°11’E, A. S . George 6370, 9 August 1964 ( PERTH); 11 km N of Boxwood Hill along Highway 1 towards Jerramungup , 34°17’S, 118°49’E, M . D. Crisp 6075, et al., 22 September 1979 ( CBG, MEL, NSW, PERTH); Boxwood Hills–Toompup road, 31 km NW from Chillilup Pool turnoff, 34°07’S, 118°29’E, M . D. Crisp 5169, 15 January 1979 ( CBG, K) .

Affinity:— In its typical form, this species differs from D. trigonophylla mainly in its phyllodes being strictly vertically flattened, and not dilated horizontally along the upper edge. Additionally, D. trigonophylla differs in having a minutely scabrous epidermis. The typical form of D. decipiens occurs near the sea; plants from farther inland have more strongly flexuose branchlets and subulate phyllodes reminiscent of D. flexuosa . However, D. decipiens may be readily distinguished from D. flexuosa by the pods, where D. flexuosa has flattened, 15–20 mm long, purple-spotted pods. In addition, D. decipiens has a truncate receptacle which is greater in diameter than the pedicel and ciliae present only at the tips of the calyx-lobes, whereas in D. flexuosa the receptacle is tapered evenly to the pedicel, and the calyx is evenly ciliate around the margins.

Other species with decurrent, vertically flattened phyllodes are D. decurrens , D. dilatata and D. pectinata . Daviesia decurrens differs from D. decipiens in having striate phyllodes and bracts, D. dilatata differs in lacking sharp ridges or wings running down the branchlets and in having multiple flowers per raceme, and D. pectinata differs in having 3–10-flowered racemes and compressed pods not more than 10 mm long.

Figures

FIGURE 100. Daviesia decipiens. A–C. Branchlets showing variation in vegetative parts. D. Unit inflorescence with floral parts except calyces omitted. E, F. Pods, showing variation. A, E from Crisp 5104 (type); B, D from Crisp 6075; C, F from Crisp 6144. Drawn by A.L. Prowse. Adapted from Crisp (1995) with permission from CSIRO Publishing.