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Photo I.Holliday

Synonymy

Hakea circumalata Meisn., Hooker's J. Bot. Kew Gard. Misc. 7: 114 (1855)

T: interior, north of Swan R. between Moore and Murchison R., W.A., 1850–51, J.Drummond 6: 192; syn: B, BM p.p., E, G-DC, K, NY, OXF, P; south-western W.A., J.Drummond 4: 290; syn: BM p.p., G, K p.p., TCD.

An image of the NY type specimen can be seen on the New York Botanical Garden site

Description

Low spreading or compact shrub, 0.3–1.5 m tall, non-lignotuberous. Branchlets and young leaves tomentose, with ferruginous and glandular hairs. Leaves simple, 1–5 cm long, 0.9–1.7 mm wide; mucro 1–3 mm long.

Inflorescence axillary or terminal, with 6–12 flowers; involucre 3–5 mm long; rachis 1.5–2 mm long, villous; pedicels 2.5–7 mm long, hirsute and sparsely glandular, with hairs white; buds curved. Perianth 3–4.5 mm long, white suffused pink, glabrous to hirsute, glandular externally, papillose internally, glaucous. Pistil 8–11.5 mm long; pollen presenter oblique or ±lateral.

Fruit obliquely ovate, 1.8–2.5 cm long, 1.2–1.7 cm wide, tuberculate, not beaked, obscurely apiculate; horns 5–6 mm long. Seed obliquely ovate, 14–20 mm long; wing encircling seed body, off-white.

Distribution and ecology

Occurs on the sand plain heaths from Perth to just north of Geraldton, and as far east as Tammin, W.A.

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 July–Sept.

Derivation of name

From circum, Latin for an entire encompassing or surrounding of an object, and alata, Latin for wing - a reference to the wing which entirely surrounds the seed-body in this species.

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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.

H. circumalata is part of the Strumosa group, a group close to the Sericea and Nodosa groups and held together by the sharing of simple terete leaves, terminal or axillary inflorescences (if the latter these resprouting in subsequent seasons), glabrous pedicel and perianth and woody, smooth or verrucose, fruits with horns. Other species in the group include H. bicornata, H. commutata, H. cycloptera, H. newbeyana,  H. preissii, H. strumosa and H. vittata.

Notes

A distinctive species with its uniquely shaped seed. Hakea circumalata is also unique in the group for its glandular hairs on the young leaves and the outside of the perianth. The internal perianth and the style are densely papillose.

Representative specimens

Western Australia: between Moora and Coorow, W.E.Blackall 3704 (PERTH); 4 km W along Greenhead road off Brand Hwy, R.J.Cranfield 1473 (PERTH); 25 km W of Three Springs towards Dongara, at turnoff to Mingenew, E.A.Griffin 1619 (PERTH); 46 km N of Northampton, K.Newbey 2200 (PERTH); 3.2 km S of Tammin, K.Newbey 9422 (PERTH).

Weblinks

Link to FloraBase treatment of this species for WA.

 

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

Further illustrations

J.Young, Hakeas of W. Australia, Botanical District of Avon 34 (1997).

I. Holliday, Hakeas. A Field and Garden Guide 38-39 (2005)

J.A..Young, Hakeas of Western Australia. A Field and Identification Guide 24 (2006)

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