Daviesia euryloba Crisp & Chandler (1997: 327)

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

38. Daviesia euryloba Crisp & Chandler (1997: 327) . Type: Western Australia, Roe, ca. 90 km NE of Ravensthorpe , 9 km SW of Welcome Soak, 33°05’S, 120°46’E, M. D. Crisp 6030, J. Taylor & R. Jackson, 21 September 1979. Holotype: CANB; isotype: PERTH

Divaricate shrubs to 1.5 m high, smooth, muricate or hispidulous on vegetative parts. Root anatomy unknown. Branchlets divaricate to ascending, terete, ribbed. Phyllodes rather crowded, diverging at ca. 90°, tending to fold up longitudinally, ovate to elliptic to narrowly so, occasionally recurved, apically acuminate and pungent, basally rounded and thickened at the articulation, 7–18 × 3–7 mm. Unit inflorescences 1 or 2 per axil, 1-flowered; peduncle nil; subtending bracts obovate, keeled, ca. 1 mm long, spreading at tips. Pedicels 3–5 mm long. Calyx 4–6 mm long including the ca. 1 mm receptacle; upper 2 lobes fused into a broad notched lip, ca. 1–1.5 mm long; lower 3 lobes triangular, ca. 1 mm long. Corolla : standard broadly elliptic, emarginate, 8–9 × 7–8 mm including the 2–2.5 mm claw, with 2 small calli at the base of the lamina, yellow with red markings; wings obovate to elliptic, apex rounded, deeply auriculate, 7–9 × 3–4 mm including the 2–3 mm claw, red; keel half depressed-ovate, acute, curving sharply upwards from base, slightly auriculate, 9–10 × 2.5 mm including the 4–5 mm claw, red. Stamens strongly dimorphic: inner whorl of 5 with longer, slender, terete filaments and shorter, rounder, versatile, confluent anthers; outer whorl of 5 with shorter, broader, compressed filaments and longer, oblong, basifixed, 2-celled anthers; filaments free. Pod obliquely very broadly obtriangular, obtuse or nearly so below the short beak, somewhat turgid, 6–7 × 5–6 mm; upper suture sigmoid; lower suture acute. Seed ellipsoid, compressed vertically, nuggetty, ca. 3.9 mm long, 2–2.6 mm wide, 1.7–1.9 mm thick, dark brown to black, not mottled; aril 1.8–2.2 mm long. ( Fig. 36L, M ).

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

Distribution:— Western Australia, from the Ravensthorpe–Lake King area eastward to near Peak Charles National Park and south to the Jerdacuttup area.

Habitat:— Sandplains, with deep white sand or gravelly sandy soil. Vegetation predominantly heath and mallee with Eucalyptus pleurocarpa a dominant species.

Selected specimens (10 examined):— WESTERN AUSTRALIA. Roe: Mt Short , N end Ravensthorpe Range, 33°28’S, 120°00’E, A . S . George 5699, 30 August 1963 ( CANB, PERTH); S of Lake King , C . E . Woolcock D 74, 1 August 1981 ( CBG); 13 km S Mt Glasse, Bremer Range , 32°39’S, 120°46’E, K . Newbey 5392, 21 July 1979 ( PERTH) .

Affinity:— Daviesia euryloba is closely related to D. cardiophylla , D. cunderdin and D. umbonata . The phyllodes of D. euryloba are mostly somewhat folded upwards longitudinally and rounded at the base, whereas those of D. cardiophylla are basally cordate or rounded and more or less flat, those of D. cunderdin are flat and rounded at the base, and in D. umbonata they are basally cuneate and flat or slightly concave. Daviesia euryloba lacks the calli below the sinuses of the calyx lobes that are present in D. cunderdin and D. umbonata . The keel of D. euryloba is shaped differently compared with the other three species, curving sharply upwards from the base to the very acute apex. The pod shape of D. euryloba is also unique among these species, being more or less obtuse near the apex, and the angle along the lower suture is also wider (closer to 90°) than in the other species.

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Figures

FIGURE 36. Daviesia cardiophylla species group. Daviesia cardiophylla. A. Flowering branchlet. B–D. Phyllodes, showing variation. E. Inflorescence (1-flowered) with calyx representing flower. F. Keel. Daviesia umbonata. G. Branchlet tip with pod. H. Phyllode. I. Keel. J. Pod. Daviesia cunderdin. K. Keel. Daviesia euryloba. L. Keel. M. Pod. A, B, E, F from Crisp 6604; C from Crisp 6151; D from Crisp 6507; G, H & J from Crisp 6686 (type); I from Woolcock D13; K from Marchant & Seabrook s.n. (PERTH 3705153); L from Woolcock D74; M from Crisp 6030 (type). Drawing by A.L. Prowse and M.D. Crisp. Adapted from Crisp (1995) with permission from CSIRO Publishing.