Daviesia lineata Crisp (1995: 1207)

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

Phytotaxa 300 (1) © 2017 Magnolia Press • 75 27. Daviesia lineata Crisp (1995: 1207) . Type [approximate locality data given because the species is rare]: Western Australia, Roe , E of Newdegate , 33°10’S, 119°20’E, J. D. Briggs 1650 & L. Silvester, 24 September 1984. Holotype: CBG; isotypes: AD, CANB, K, MEL, MO

Broom-brush shaped shrubs, with one to several stems, to 2.5 m high, minutely papillate. Root anatomy normal (unistelar). Branchlets erect, angular, ribbed. Phyllodes scattered, erect, terete, straight or gently curved, apically acicular and pungent, basally articulate, 30–110 mm long, 0.75–1 mm diam., finely striate even when fresh, green. Unit inflorescences 1 or 2 per axil, umbelliform, 1- or 2-flowered; peduncle 1.5–4 mm long; rachis 0–1 mm long; subtending bracts spreading at tips, oblong, ca. 1 mm long; barren bracts few, oblong, spreading at tips, ca. 0.75–1 mm long. Pedicels gently thickening upwards, 4–8 mm long. Calyx 4.5–6 mm long including the ca. 1.5 mm stipe-like receptacle; upper 2 lobes united in a broad, truncate, emarginate lip, ca. 1 mm long; lower 3 lobes triangular, ca. 1 mm long. Corolla : standard very broadly ovate, emarginate, auriculate, 8–10 × 8.5–11 mm including the ca. 1.5 mm claw, with 2 small calli at the base of the lamina, rich yellow with dark red infusion towards centre and a bright yellow centre; wings obovate with uncinate auricles, 7–7.5 × 3–4 mm including the 1.5–2 mm claw, orange-red; keel half transversely broadly elliptic, scarcely acute, auriculate, slightly saccate, ca. 6.5 × 3 mm including the 1.5–2 mm claw, red. Stamens strongly dimorphic: inner whorl of 5 with subterete filaments and versatile, globose anthers with confluent thecae; outer whorl of five with flattened filaments and basifixed, obloid, 2-celled anthers; filaments ± equal in length, overlapping, free. Pod obliquely shallowly obtriangular with an acuminate apex and long, pungent beak, 17–20 × 8–11 mm, rather thick-walled; upper suture almost straight; lower suture acute to 90° and strongly falciform. Seed not seen. ( Fig. 28 ).

Flowering period:— September and October. Fruiting period: From September.

Distribution:— Western Australia, eastern wheatbelt, restricted to the Newdegate–Lake King area.

Habitat:— Grows in pale sand or sandy loam over lateritic gravel on low ridges in a gently undulating landscape mostly cleared for agriculture. Vegetation is open mallee-heath (kwongan) dominated by Eucalyptus pleurocarpa Schauer (1844: 132) or kwongan (heath) and species of Acacia , Allocasuarina , Banksia , Callitris , Hakea , Gastrolobium , Grevillea , Leptospermum J.R.Forster & J.G. Forster (1775: 71) , Melaleuca , Santalum Linnaeus (1753: 349) and Verticordia .

Conservation status:— National: Not listed. WA: Priority 2, possibly threatened or near-threatened but not yet adequately surveyed.

Selected specimens (8 examined):— Approximate locality data given because the species is rare. WESTERN AUSTRALIA. Roe: Newdegate to Lake King , 33°10’S, 119°10’E, M . D. Crisp 8522 & W . Keys , 28 September 1993 ( CANB, K, MEL, PERTH); ibid., R. J . Hnatiuk 830072, 1 October 1983 ( CANB); ibid., K. R . Newbey 10873, 23 January 1985 ( CANB, PERTH); ibid., 33°10’S, 119°20’E, J . D. Briggs 1651 & L . Silvester , 24 September 1984 ( CANB, PERTH); ibid., J . Taylor 2305 & P . Ollerenshaw, 26 September 1983 ( CBG, PERTH); Newdegate–Lake King area , 33°’ S, 119°20’E, J . D. Briggs 1653 & L . Silvester , 24 September 1984 ( CANB, NSW, PERTH); ibid., S . Patrick s.n., 29 August 1986 ( PERTH 2573113 ) .

Affinity:— Daviesia lineata shows a close superficial resemblance to three other species with erect, terete phyllodes, viz. D. apiculata , D. oxylobium and D. teretifolia . None of these has phyllodes <1 mm in diameter, nor with such fine striations as seen in D. lineata . Their inflorescences are more than 2-flowered and their keel petals are falcate and much narrower than in D. lineata . Daviesia teretifolia is generally <1 m tall, has glaucous phyllodes with a distinctly acicular apex and has longer pedicels (mostly 8–15 mm long) than D. lineata . Daviesia oxylobium differs in having acicular apices to the phyllodes, and flowers about half the size of those of D. lineata (e.g. standard 4–4.5 × 5.5–6 mm). In D. apiculata , the phyllodes are apiculate and only semi-pungent, their colour is grey-green and the flowers are about half the size of those of D. lineata (e.g. standard 4–4.5 × 5 mm).

VI.b. Umbel Clade

Figures

FIGURE 28. Daviesia lineata. Holotype. Photograph provided by the Curator of CANB.