Daviesia emarginata ( Miq.) Crisp (1995: 1191)

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

104. Daviesia emarginata ( Miq.) Crisp (1995: 1191) . Fusanus emarginatus Miquel (1845: 617) . Type : ‘ In asperis haud longe a monte Wuljenup distr. Plantagenet, October 1840. Herb. Preiss. no. 2112.’ Lectotype (Crisp 1995: 1191): LD (sheet stamped 82/73–2132); isolectotype: G, K, MEL, U

Daviesia obtusifolia Mueller (1860: 104) , Bentham (1864: 77). Type: ‘In planitiebus prope Willonjup Novae Hollandiae austro-occidentalis. Mxw.’ Holotype: MEL.

[ Fusanus spicatus auct . non Brown (1810: 255): Miquel (1845: 617). Specimen cited: ‘Ad prom. Cape-Riche, 21 Nov. 1840 lect. Herb. Preiss. No. 2119.’ Specimens seen: LD.]

Shrubs, 0.3–1.7 m high, mostly glabrous though occasionally with sparse hairs on branchlets and phyllodes. Root anatomy with anomalous secondary thickening (cord type). Branchlets ascending, terete to triquetrous, ribbed. Phyllodes scattered, ascending to erect, narrowly obovate to obovate, apex rounded to emarginate, mucronate, base constricted to a pseudo-pedicel, articulate, 24–50 × 3.5–9.5 mm, thickish when fresh, wrinkled with visible venation when dry, pale green with yellow margins, glaucescent. Unit inflorescences 1 per axil, racemose, 3–8- flowered; peduncle 1.5–6 mm long; rachis 3–12 mm long; barren basal bracts oblong, ca. 0.5 mm long; subtending bracts oblong, ca. 1 mm long. Pedicel 2.5–4 mm long, thickened towards the apex. Calyx with minute white dots, 4.5–5 mm long including the ca. 2 mm, stipe-like receptacle; upper 2 lobes united into a broad, truncate lip, ca. 1.25 mm long; lower 3 lobes triangular, ca. 0.5 mm long. Corolla : standard transversely ovate, emarginate, with a prominent central channel, ca. 4.5 × 5–5.5 mm including the 1.25 mm claw, yellow; wings obovate with a rounded, incurved apex, auriculate, slightly saccate, sometimes unequal in size, ca. 4.5 × 2.5 mm including the 1.25 mm claw, yellow with a pink base; keel half very broadly elliptic with an obtuse apex (spout-like), auriculate, saccate, ca. 4.25 × 1.75 mm including the 1.25 mm claw, yellow with a pink base. Stamens slightly dimorphic: inner whorl of 5 with longer, terete filaments and shorter, slightly rounder, subversatile, 2-celled anthers; outer whorl of 5 with shorter, broader, flattened filaments and longer, narrower, basifixed, 2-celled anthers; filaments cohering. Pod obliquely shallowly obtriangular with an acuminate apex, robust, 18–21 × 9–9.5 mm, leathery; upper suture almost straight; lower suture acute. Seed with a continuous aril. ( Fig. 105 ).

Flowering period:— January to May. Fruiting period: The only two specimens seen fruiting were both collected in October.

Distribution:— Western Australia, south coast and hinterland from Albany and the Stirling Range east to Ravensthorpe.

A MONOGRAPH OF DAVIESIA

Phytotaxa 300 (1) © 2017 Magnolia Press • 233 234 • Phytotaxa 300 (1) © 2017 Magnolia Press

CRISP ET AL.

Habitat:— Grows in sand and lateritic soil, on undulating sandplains in mallee-heathland, including eucalypts such as E. goniantha Turczaninow (1847: 163) , E. incrassata Labillardière (1806 : t. 150), E. pleurocarpa and E. uncinata Turczaninow (1849: 23) .

Selected specimens (25 examined):— WESTERN AUSTRALIA. Roe: Dunn Rock Nature Reserve , NW end of Internal Firebreak no. 1, 33°17’S, 119°30’E, K. J . Atkins 1750, 7 October 1984. Eyre : 37 km S of Borden, ca. 34°21’S, 118°08’E, J. W . Green 393, 31 March 1956 ( PERTH); near Red Gum Pass, Stirling Range , 34°22’S, 117°48’E, A. S . George 6109, 27 March 1964 ( PERTH); 7 km NW of Chillinup Pool on Pallinup River , 34°18’S, 118°34’E, M . D. Crisp 5149, 15 January 1979 ( CBG, MEL, PERTH); SW foot of East Mt Barren , 33°56’S, 120°01’E, A . Strid 22459, 16 March 1983 ( C, CANB, K, PERTH); Ravensthorpe Range , 9 km SSE of Mt Desmond, 33°41’S, 120°12’E, M . D. Crisp 4982, 9 January 1979 ( CBG, L); Fitzgerald River National Park , 7 km SW of Annie Peak, 33°53’S, 119°55’E, M . D. Crisp 5019, 11 January 1979 ( CBG) .

Affinity:— This species is closely related to D. daphnoides ( Fig. 1B ), which shares a similarity in general aspect, as well as details of the reproductive structures. The most obvious difference is in the phyllode apex, which is acuminate and pungent in D. daphnoides , but obtuse and emarginate in D. emarginata .

Daviesia argillacea was once included under D. emarginata as a variety (as D. obtusiflora var. parvifolia , q.v.) but differs in having smaller (mostly 7–25 mm long), glaucous phyllodes. The molecular phylogeny shows that these species are not closely related and, in morphology, the flowers of D. argillacea are quite different; in particular, the calyx is smaller (ca. 3 mm), lacking a long receptacle and white dots.

Figures

FIGURE 1A. Phylogeny (part) of Daviesia estimated using maximum likelihood (PHYML) from concatenated sequences of ITS (nrDNA), and ndhF and trnL–trnF (cpDNA). The tree was rooted using the monotypic sister groups Viminaria and Erichsenia (not shown). The informal clade names are used for reference in the taxonomic treatment. Numbers on branches show non-bootstrap support. The tips are labelled with the taxon name and sample accession number.

FIGURE 105. Daviesia emarginata. A. Flowering branchlet. B. Inflorescence. C. Pod. A from Green 393; B from Crisp 4982; C from Crisp 5019. Drawn by B-J. Osborne. Adapted from Crisp (1995) with permission from CSIRO Publishing.