Hakea aenigma
Enigma Hakea
Enigma Hakea
Wikipedia links: ngiosperms > Eudicots > Proteales > Proteaceae > Hakea aenigma
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Common name: Enigma Hakea
Conservation status: Critically endangered
Hakea aenigma is listed as "Critically endangered" on the IUCN Red List of Threatened Species due to the possibility of the entire population consisting of clonal colonies descended from a single individual
This results in little to no genetic variation which makes it more vulnerable to threats such as pathogens, climate change and possible increase in fire regimes
Etymology:
The genus is named after Baron Christian Ludwig von Hake, an 18th-century German patron of botany
The specific epithet is taken from the Latin word aenigma meaning "riddle", "something obscure" or "inexplicable" referring to the puzzlement of finding no fruit for the plant and the uncertainty of its origins
Flowers:
Each inflorescence has 16-33 flowers growing on an individual stalk
Pedicels and perianth are cream-white and smooth
The style 4.5–7.2 mm long
Flowers are sterile so no fruit is produced and plants can only reproduce vegetatively by suckering roots
Hakea pulvinifera is the only other species reliant on this method for reproduction
Hakea aenigma has cream-white blooms throughout spring from September to November
Fruit:
Leaves:
The glabrescent leaves are flat and linear 5 to 35 cm long and 3 to 10 mm wide
They have prominent longitudinal veins 1-7 above and 4-9 on the underside
Stem & branches:
Smaller branches are densely covered with flattened fine hairs, thinning nearer flowering time
Roots:
Habit:
A rounded bushy shrub 1.5 to 2.5 m high
Habitat:
Distribution:
Endemic to Kangaroo Island in South Australia
This species is endemic to a small area on the western end of Kangaroo Island in South Australia
It is confined to the more elevated parts of the lateritic plateu system, up to 100 m above sea level and is part of the dense mallee-heath that grows in clay-loam to sandy soils
Additional notes:
It is one of two Hakea species totally reliant on suckering to reproduce therefore having "reached evolutionary dead-ends" as this method of reproduction greatly limits genetic variation
The entire population of this species may be of clonal colonies descended from a single individual
Taxonomy
Hakea aenigma was first formally described by the botanists Laurence Arnold Haegi and William Robert Barker in 1985 and the description was published in the Journal of the Adelaide Botanic Gardens
Sources of information: