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Habit (cultivated). Photo I.Holliday

Leaves, flowers and fruit. Photo I.Holliday

Close-up of inflorescence. Photo W.R.Barker

Recurved leaf apices and fruit. Photo W.R.Barker

Synonymy

Hakea adnata R.Br., Suppl. Prodr. Fl. Nov. Holl. 26 (1830)

T: south west coast of New Holland, [Western Australia], 1823, W.Baxter 160; syn: BM, K p.p.

Hakea lativalvis F.Muell., Fragm. 6: 219 (1868). T: west end of Russel R., Western Australia, without date, Anon. s.n.; syn: MEL 108056; Esperance, Western Australia, 17 Sept.?, G.Maxwell s.n.; syn: K p.p., MEL 108055; without locality, without date, Anon. s.n.; syn: MEL 108057; Sand plains N of Cape Arid, Western Australia, without date, Anon. s.n.; syn: MEL 108058.

Description

Upright stiff broom-like shrub, 1–3.5 m tall, non-lignotuberous. Branchlets and young leaves ferruginous. Leaves 2.5–13 cm long, 1–1.5 mm wide, constricted basally, ungrooved; mucro bent.

Inflorescence with 2, 4 or 6 flowers; involucre c. 3 mm long; pedicels 2–2.5 mm long, densely appressed-sericeous, with hairs white, extending onto perianth. Perianth 4.5–5.5 mm long. Pistil 7.5–10 mm long; disc of pollen presenter 0.8–0.9 mm long; gland 1.2–1.4 mm long, ±erect.

Fruit erect or inserted at angle to stalk, obliquely obovate, 2.5–3.8 cm long, 2–3 cm wide, finely black-pusticulate or smooth; beak decurrent down one side; apiculum 1–2 mm long. Seed 16–23 mm long, occupying part of valve; wing encircling seed body.

Distribution and ecology

Occurs in south western Western Australia between Hopetoun, Norseman and Israelite Bay; grows in sand in Banksia speciosa heathland or shrub mallee.

To plot an up to date distribution map based on herbarium collections for this species see Australia's Virtual Herbarium. Localities outside the native range may represent cultivated or naturalised records.

Flowering time

Flowers Aug.–Oct.

Derivation of name

From adnata, Latin for united with. There is no indication in the original description of the significance of this epithet.

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Relationships

Part of Section Hakea of Bentham (as Euhakea) and characterised by a non-conical pollen presenter, leaves without obvious venation, perianths with or without hairs and fruits with or without horns. Barker et al. (1999) recognised a number of informal morphological groups within the section.

Within this section 5 species were assigned to the informal Obliqua group by Barker et al. (1999). The group is close to the Ceratophylla group, sharing the morphological characteristics of few-flowered inflorescences with pubescent flowers on an obscure rachis, oblique pollen presenters and distinctly woody fruits without horns and usually without beaks and seed in which the wing encircles the seed body; the groups differ in the terete leaves of this group compared with the flat leaves of the Ceratophylla group. 

Members of the group are H. adnata, H. brachyptera, H. obliqua, H. polyanthema and H. psilorrhyncha, all from southern WA.  

Notes

Hakea adnata is usually easily distinguished from other terete-leaved species in the region by its bent, rather than upright, mucro. The bent mucro is visible in images 2-4. Note also the thickened stalk bearing the fruit in image 4.

Representative specimens

W.A.: 13.5 km N of Mt Ridley, W.Archer 1808902 (AD, HO, PERTH); 16 km N of Esperance, J.S.Beard 2325 (PERTH); c. 10.5 km W of Israelite Bay, A.S.George 2139 (PERTH); c. 20 km N of Israelite Bay, R.Hnatiuk 761233 (PERTH); 5 km N of Gibson, R.D.Royce 3568 (PERTH).

Weblinks

Link to FloraBase treatment of this species for WA.

 

For further information and images of this species in the Esperance region of Western Australia see William Archer’s Hakea page in Esperance Wildflowers

 

More photographs of this species can be seen on the Australian National Botanic Gardens site.

Further illustrations

I. Holliday, Hakeas. A Field and Garden Guide 12-13 (2005)

J.A..Young, Hakeas of Western Australia. A Field and Identification Guide 9 (2006)

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