Daviesia horrida Preiss ex Meisner (1844: 54)

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

80. Daviesia horrida Preiss ex Meisner (1844: 54) , Bentham (1864: 77), Crisp (1987a: 250), Crisp (1995: 1200), Wheeler et al. (2002: 743). Type: ‘In regionibus interior. Australiae meridionali-occidentalis m. Nov. 1840. Herb. Preiss. no. 1142. et in limoso-arenosis ad latus montis prope cataractum ad caput fl. Cygnorum, d. 26. July 1839. No. 1171. (Drummond n. 230.)’. Lectotype (Crisp 1995: 1200): Preiss 1171 ( LD) ; isolectotype: BR, G (3 sheets) , GOET (2 sheets) , MEL (2 sheets), MO, NY, P (2 sheets), S, W (2 sheets). Syntype: Preiss 1142 ( LD, NY) . Syntype: Drummond 230 ( BM) ; isosyntype: G (2 sheets) , K (2 sheets) , MEL, OXF, P (2 sheets), W (2 sheets)

Divaricate shrubs, 0.5–1.8 m high, glabrous, glaucous. Root anatomy normal (unistelar). Branchlets terete, rigid, spiny, striate when dry, upper branchlets becoming leafless. Phyllodes when present scattered to subopposite, spreading or ascending, narrowly elliptic or obovate, or linear, apically acute to scarcely so, with a small mucro, tapered to base or both ends, articulate, 18–130 × 1.5–20 mm, venation ± longitudinal, prominent when dry. Seedling phyllodes almost opposite, linear to narrow-elliptic or rarely -obovate, tapering to both ends, base constricted to a petiole-like base, venation prominent, 65–110 × 6–12 mm, not reduced to scales. Unit inflorescences 1 per axil, racemose, 3–10-flowered; peduncle ca. 1 mm long; rachis 1–20 mm long; barren basal bracts few, forming an involucre, appressed, oblong, ca. 0.5 mm long; subtending bracts spreading, oblong, slightly hooded, ca. 1.75 mm long. Pedicels 1–7 mm long. Calyx 4.5–5 mm long including the ca. 1.5 mm receptacle; lobes equal, acuminate, triangular, ca. 1 mm long. Corolla : standard transversely broadly elliptic, emarginate, 8–9 × 7–8.5 mm including the ca. 2.5 mm claw, orange with a dark red centre and a single central yellow marking; wings obovate, apex rounded and incurved to enclose the keel, deeply auriculate, 6.5–7.5 × 2.5–3 mm including the ca. 2 mm claw, dark red; keel half very broadly obovate, acute, auriculate, saccate, 5–6 × 2 mm including the 1.5–2 mm claw, dark red. Stamens strongly dimorphic: inner whorl of 5 slightly longer, angular-terete filaments and shorter, versatile, round anthers with confluent thecae; outer whorl of 5 with slightly shorter, compressed filaments and longer, basifixed, oblong 2-celled anthers; filaments free. Pod obliquely shallowly

A MONOGRAPH OF DAVIESIA

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obtriangular, sharply beaked, very compressed, 15–18 × 9–11 mm, greyish; upper suture sigmoid; lower suture acute. Seed obloid, ca. 5 mm long, 3 mm broad, 2 mm thick, black; aril ca. 4 mm long. ( Fig. 80 ).

Common name:— Prickly Bitter-pea.

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CRISP ET AL.

Flowering period:— July to September. Fruiting period: September to December.

Distribution:— Western Australia, from Bindoon north of Perth, and the Darling Range, south to Busselton and east to the Pallinup River, east of Albany.

Habitat:— Grows on rocky hillsides or in sandy loam or sandy clay with gravel on undulating to hilly terrain, in mixed, open Eucalyptus forest with a dense, low shrub understorey.

Selected specimens (80 examined):— WESTERN AUSTRALIA. Avon: Upper Swan River , Sewell, s.n. ( MEL 81287 ). Darling: Near 37 mile peg Perth to Albany Road, 32°22’S, 116°15’E, N. T . Burbidge 2251, 8 September 1947 ( CANB); ca. 3 km N of Mt Barker (near the road to Cranbrook), 34°37’S, 117°40’E, Hj. Eichler 16189, 31 August 1959 ( AD, CANB); Swanview, Darling River , 31°53’S, 116°03’E, A . Morrison s.n., 17 November 1902 ( CANB 336611 , E); N slopes of Mt Angwin above scenic road, Porongorup Range, Porongorup National Park , 34°40’S, 117°51’E, E. N. S . Jackson 3304, 13 September 1977 ( AD, CANB, PERTH); Canning Mills Road, Gosnells , 32°05’S, 116°00’E, R. J . Cranfield 424, 20 August 1978 ( CANB, PERTH); Darling Range, near the Preston River , 1.5 km SE of Mumballup, S of Collie, 33°32’S, 116°07’E, M . D. Crisp 1032, 11 August 1975 ( CBG, PERTH); Swan River , A . Lea, August 1898 ( PERTH); Darling Range , 56 km N of Midland and 5 km S of Bindoon on Great Northern Highway, 31°25’S, 116°05’E, M . D. Crisp 6631–2, 21 July 1980, seedlings ( CBG with some duplicates to AD, PERTH); Serpentine Falls , 32°22’S, 116°08’E, J. W . Green 359, 14 August 1955 ( PERTH); Kalamunda , 31°58’S, 116°03’E, R. & M . Hamilton 130, 22 July 1985 ( CANB, HO, MEL, PERTH). Eyre: Kamballup on rocky area, 34°35’S, 117°59’E, M. A . Clements 194a, 25 October 1975 ( CBG); 2 km SW of Pallinup River crossing along Highway 1 towards Albany , 34°26’S, 118°45’E, M . D. Crisp 5117, 14 January 1979 ( CBG, PERTH) .

Affinity:— Leafy plants can resemble broad-leaved plants of D. longifolia but this species lacks the rigid, divaricating, spinescent, leafless upper branchlets of D. horrida . Leafless specimens may be confused with D. divaricata , which differs in having two rather than a single yellow marking on the standard. Daviesia divaricata also has generally fewer flowers (1–6) per inflorescence. Daviesia horrida is easily distinguished from D. divaricata subsp. lanulosa by the lack of woolly hairs around the inside of the calyx lobes.

Figures

FIGURE 80. Daviesia horrida. A. Flowering branchlet. B. Inflorescence. C. Pod. A from N.T. Burbidge 2251; B from Crisp 6631; C from Clements 194a. Drawn by A.L. Prowse.