Hakea invaginata       16080

This is an erect shrub, 1.3-4m tall, non-sprouting. The branchlets are densely tomentose and appressed-pubescent at flowering.

The leaves are terete, with 5 deep narrow grooves running entire length, 7-22cm long, 1.2-1.5mm in diameter, glabrous to sparsely sericeous on faces, moderately sericeous in grooves. There are 5 longitudinal veins (the broad faces separated by grooves).

The inflorescence is a solitary axillary umbelliform raceme, grouped to form elongate brushes, with 60-80 flowers per axil. The pedicels are glabrous. The perianth is usually pink, sometimes white ageing deep pink. The pistil is 10-12.5mm long. The gland is subglobular.

There are 1-6 fruits per axil, stalked, obliquely elliptic-acuminate, sometimes curved, 1.6-2.2cm long, 0.8-1.1cm wide, scarcely beaked but often abruptly narrowed into a short apiculum. The seed is obliquely ovate-elliptic, acute, 11-14mm long, 5-6mm wide. The wing is extending fully down both sides of body, more broadly down on one side than the other, usually notched near base adaxially, sepia to dark brown with blackish brown patches towards base.

This species is sometimes confused with Hakea scoparia, Hakea meisneriana or Hakea subsulcata. Hakea invaginata is distinct from all of them because the apparent striations on the leaves are in fact extremely narrow deep grooves much narrower than the flattened ridges.

The Genus: Hakea Section: Conogynoides Serie: Ulicina having the following characters: Shrubs, without corky bark. Leaves simple, flat or apparently terete (but 3–12-angled in cross-section) with longitudinal veins at each angle to give sulcate appearance, non-petiolate, not stem clasping, entire, with at least marginal veins and midvein visible below. Inflorescence an axillary umbelliform or moderately elongate raceme, rarely arising from older leafless axils and 1 or 2 per axil, developing within involucre; bracts not persisting at base of inflorescence; rachis knob-like to elongated. Flowers 6–80; pedicels glabrous. Perianth curved in bud, splitting to base into 4 distinct tepals, glabrous. Pistil 3–18 mm long; pollen presenter erect, conical; gland a small flap to ±globular, or absent. Fruit usually more than 1 per axil, erect, retained on plant, woody, smooth to prickly, usually beaked, not horned, usually shortly apiculate, dehiscing fully or partly down one or both sides. Seed occupying part of valve; wing encircling seed body or extending fully or partly down both sides, usually more broadly on one side, rarely down one side only.

A group of 21 species, occurring mostly in southern W.A., with a few in S.A., Vic. and N.S.W., extending to islands of Bass Strait, Tas.

This species is very showy in flower. It is useful for narrow sites. It responds well to light pruning.

References
- Flora of Australia. profiles.ala.org.au/opus/foa/profile Vol. 17B pag. 156-157. Hakea invaginata
- Hakeas, a field and garden guide, Ivan Holliday. 2005 pag. 98-99. ISBN

- Encyclopedia of Australian Plants, Elliot W. Rodger & Jones David L. 2012 pag. 186-189. ISBN
- Australian Proteaceae: new taxa and notes, McGillivray, Donald. Telopea 1975 Vol. 1(1) pag. 19-32. DOI
- Flora of Australia. profiles.ala.org.au/opus/foa/profile Vol. 17B pag. 1-35. Hakea
- New species, new combinations and other name changes in Hakea (Proteaceae), Barker, RM. Journal of the Adelaide Botanic Garden 1990 pag. 95-110. JStor
- Novelties and Taxonomic Notes Relating to Hakea Sect. Hakea (Proteaceae), Mainly of Eastern Australia, W.R. Barker. Journal of the Adelaide Botanic Gardens 1996 Vol. 17 pag. 177-209. JStor
- Taxonomic notes on Hakea Schrader (Proteaceae), mainly relating to South Australia, Barker, WR. Journal of the Adelaide Botanic Garden 1985 pag. 233-247. JStor
- The Hakea pedunculata group of species (Proteaceae) and a new subspecies of Hakea stenophylla from Western Australia, Barker, R. M. Nuytsia: journal of the Western Australian Herbarium 1998 Vol. 12 pag. 1-8. Address
- Towards a revision of the Hakea epiglottis Labill.(Proteaceae) complex of Tasmania, Barker, RM. 1991 Vol. 124(2) pag. 79-84. Address
- The use of Trees and Shrubs in the Dry Country of Australia, Norman Hall. 1972 pag. 384-385. ISBN

Biological type: shrub
Frost resistance: 18ºF
Leaf color: dark green
Flower color: pink
Climber plant: Yes
IUCN Red List of threatened species status: Least Concern

Specifications for the Mediterranean basin
Adult size (h x w): 9,8ft x 9,8ft
Sun exposure: part sun (Sun hours: >3h <6h
Foliage: evergreen
Growth: fast
Flowering time from January until March

Specific information for our garden
Planting substrate: 30%Compost+30%Coco+40%Sand
Plant watering: 1x a week pH 6.5
Logical sequence of containers for: Heathers; forestry plate, forestry pot 3L, Airpot 12L, Airpot 50L
Propagation is done by cuttings

Ecology in its country of origin
Rainfall: 300-600mm
Sandy soil: much

SPRING Sow the seeds at 2mm depth in the Well Drained Seed Sowing Mix between 50-59°F. During germination keep the substrate moist and in daylight. The seeds germinate in 3-6 weeks.

Germination references
- Seeds: Ecology, Biogeography, and, Evolution of Dormancy and Germination, Baskin, Carol and Baskin, J.M. 2014 pag. 1-1586. DOI

Cuttings instructions
Take the cuttings in early fall. Soak them in a hormonal preparation for cuttings before planting them in a substrate composed of 50% perlite and 50% heather earth. Keep them sufficiently moist at a temperature of 20°C in sealed freezer bags. Keep the light on for 16 hours a day.