Plants of
South Australia
Correa calycina var. halmaturorum
Rutaceae
De Mole River Correa
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Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
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Extinct
Data deficient
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Etymology

Correa named after Jose Francisco Correa de Serra (1751-1823), a Portuguese botanist. Calycina from the Greek 'kalux' meaning case of bud, husk; referring to its persistent (or conspicuous) calyx. Halmaturina is derived from Halmaturus, a generic name once applied to kangaroos, and is from the Greek 'halme' meaning a leap or bound, and commonly used as an epithet for species from Kangaroo Island.

Distribution and status

Endemic to South Australia and found only in the De Mole River area on Kangaroo Island, growing along the river banks in deep damp soil overlying shale in Eucalyptus cladocalyx forest. Native. Very rare in South Australia.
Herbarium region: Kangaroo Island
NRM region: Kangaroo Island
AVH map: SA distribution map (external link)

Plant description

Tall dense shrub to 3 m high and 2 m wide with stems covered in dense strongly rusty-flocculose (small egg-shaped lobe). Leaves oblong-elliptic, to 4 cm long and 2.5 cm wide, margin slightly recurved, obtuse, scabridulous above, densely fawn- to rusty-stellate-hairy below. Inflorescence solitary on lateral or axillary branchlets with tubular, green often darkening to mauve flowers, calyx lobes lanceolate-acuminate. This variety differ from the other variety found in South Australia, Correa calycina var. calycina which have sparsely to moderately dense stellate-hairs on the underside of the leaves rather than dense stellate-hairs. Flowering between October and March. Fruits are pale brown capsule with 1- 4 segments enclose by the sepals. Seeds are dark brown mottled reniform seed to 4.3 mm long and 2.3 mm wide, with a smooth surface. Seed embryo type is linear fully developed.

Seed collection and propagation

Collect seeds between January and May. Collect mature capsules, those that are turning a pale straw colour and contain hard seeds, either by hands or place small breathable bags over immature capsules to collect seed. Capsules maybe hard to see as it is enclose by the green sepals. Place the capsules in a tray and leave to dry for a weeks. Then rub the capsules gently by hand to dislodge the seeds. Be very careful as the seed coat is thin and easily damaged. Use a sieve to separate the unwanted material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place. This species has morphophysiological dormancy and can be difficult to germinate.

Fire Response

Obligate re-seeder, tiny seedlings noted emerging in fire scars and re-sprouting observed.

Longevity: >20 years

Time to flowering: 4 to 5 years

Recovery work

In 2020-2021 this species was assessed post-fire in 1 year old fire scars. Further populations will be assessed and seeds collected on Kangaroo Island in 2021–2022. Germination screening testing the response to fire cues will be undertaken in 2021.This project work was undertaken with funding awarded under Greening Australia's Project Phoenix.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA680 (4.44 g)30+12-Dec-2016DJD3557
Kangaroo Island
1-Nov-201792%-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.
Germination table:
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