Daviesia stricta Crisp (1982b: 63)

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

6. Daviesia stricta Crisp (1982b: 63) , Crisp (1995: 1239), Craigie (2015: 32). Type: South Australia, Flinders Ranges, Wilpena Pound, 31°30’S, 138°30’E, M.D. Crisp 830, 31 August 1974. Holotype: CBG; isotypes: AD, BISH, CANB, K, L, MEL, NSW, PERTH, US.

Open shrubs to 1.5 m high, glabrous. Root anatomy unknown. Branchlets unarmed, usually rigidly erect, compressed, triquetrous, narrowly winged, smooth. Phyllodes scattered, erect or ascending, compressed horizontally, narrowly to linearly elliptic, apically obtuse or acute, mucronate, tapered to articulate base, decurrent, 10–100 × 1.5–15 mm, with a prominent midrib and obscure venation, coriaceous, glaucescent. Unit inflorescences (1)2(–5) per axil, umbelliform, 3–5-flowered; peduncle 3–7 mm long; barren basal bracts ascending, smaller; subtending bracts reclinate, ovate, ca. 3 mm long. Pedicels slender, 2–5 mm long. Calyx 5–6.5 mm long including 1–1.5 mm receptacle, viscid, green on hypanthium and tube grading to maroon on lobes, accrescent in fruit; lobes uniform, ca. equal to tube, acuminate, recurved at tips, with raised midribs. Corolla : standard very broadly ovate, emarginate, ca. 7.5 × 6.5 mm including the 2.5 mm claw, orange with purplish markings; wings obovate with a rounded incurved apex, auriculate, 5–5.5 × 1.5–2 mm including the 1.5–2 mm claw, purplish; keel half very broadly elliptic, acute, slightly auriculate, saccate, ca. 4.5–5 × 2 mm including the 1.8–2 mm claw, purplish. Stamens strongly dimorphic: inner whorl of 5 with terete; filaments free and broadly ovoid, versatile anthers with confluent thecae; outer whorl of 5 with compressed filaments and ovoid, versatile, 2-celled anthers; filaments free. Pod obliquely shallowly obtriangular, acuminate, compressed, 9–13 × 5–7 mm, enclosed at base by enlarged calyx; upper suture slightly sigmoid; lower suture acute. Seed reniform in outline, compressed, ca. 4.5 mm long, ca. 2.5 mm broad, ca. 1.5 mm thick; aril not seen. ( Fig. 7 ).

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

A MONOGRAPH OF DAVIESIA

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Distribution:— Known only from the Flinders Ranges, South Australia, where it extends from the Gammon Range south to Wilpena Pound and south-east to the vicinity of ‘Bibliando’ station.

Habitat:— Occurs on ridges and preciptious mountain slopes, on skeletal soils derived from quartzite. Associated vegetation is usually tall mallee-shrubland dominated by eucalypts such as Eucalyptus flindersii Boomsma (1980: 293) and E. viridis R.T. Baker (1900: 316) , as well as sclerophyll shrubs such as Melaleuca orophila Craven (2006: 472) and Triodia irritans Brown (1810a: 182) .

Conservation status:— National: Not listed. SA: Rare.

Selected specimens (18 examined):— Approximate locality data are given because the species is rare. SOUTH AUSTRALIA. Flinders Ranges: Gammon Plateau , 30°30’S, 139°00’E, C. W . Bonython et al. s.n., 19 September 1956 ( AD 95735023 ); Bibliando Station , 31°50’S, 139°00’E, M . D. Crisp 759, 14 April 1974 ( CBG) ;

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CRISP ET AL.

Wilpena Pound, 31°30’S, 138°30’E, M . D. Crisp 829, 31 August 1974 ( CBG, K); ibid., M . D. Crisp 834, 31 August 1974 ( AD, AD, CBG); Bibliando Station , 31°50’S, 139°00’E, M . D. Crisp 898, 20 October 1974 ( AD, BISH, BRI, CANB, K, MEL, MO, NSW); ibid., M . D. Crisp 899, 20 October 1974 ( AD, BM, CANB, K, L, NT, PERTH); Mt Hack , ca. 50 km SE of Leigh Creek, 30°50’S, 138°50’E, T. R. N . Lothian 5282 & 5283, 9 September 1973 ( AD) .

Affinity:— The only species likely to be confused with D. stricta is D. wyattiana which, despite obvious similarities in the inflorescence and the triquetrous, winged branchlets, may be readily distinguished by its calyx, which does not enlarge significantly in fruit, is not viscid, and has acute, green, scarcely recurved lobes. The peduncle (7–28 mm) and pedicels (7–15 mm) are longer in D. wyattiana , while the pod (7–10 mm) is shorter.

Figures

FIGURE 7. Daviesia stricta. A. Flowering branchlet. B. Inflorescence in bud. C. Calyx. D. Standard. E. Wing. F. Keel. G. Pod with enlarged calyx. A from Crisp 829; B–G from Crisp 830 (type). Drawn by A.L. Prowse and M.D. Crisp. Adapted from Crisp (1980a) with permission from the Board of the Adelaide Botanic Gardens.