Plants of
South Australia
Grevillea lavandulacea ssp. rogersii
Proteaceae
Rogers' Grevillea
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Regional Species Conservation Assessments per IBRA subregion.
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Vulnerable
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Etymology

Grevillea after Charles Francis Greville (1749-1809), a co-founder of the Royal Horticultural Society. Lavandulacea from the genus Lavandula for lavender, and the Latin '-acea' meaning resembling to, referring to the foliage which was thought to resemble lavender. Rogersii is named in honour of Dr. Richard Sanders Rogers (1862-1942), SA physician and amateur botanist, who collected this species at Cape Borda.

Distribution and status

Endemic to South Australia and found only on Kangaroo Island, growing on calcareous or lateritic sand, in sclerophyllous woodlands. Uncommon in South Australia.
Herbarium region: Kangaroo Island
NRM region: Kangaroo Island
AVH map: SA distribution map (external link)

Plant description

Sprawling shrub to 0.5m high and 2 m wide with hairy stems. Leaves ascending or downturned by the presence of axillary shoots, rigid, linear to 0.8 cm long and to 2.5 mm wide, upper surface tomentose, with the midrib sometimes prominent, lower surface appressed-tomentose but usually obscured by recurved margins, apex acute, grading into a mucro. Inflorecence a raceme, subterminal on short shoots with 1-4 red flowers, with a whitish perianth limb. Flowering between October and November. Fruits curved, narrow-ovoid to 12 mm long, covered by short appressed hairs mixed with some long raised hairs. Seeds are narrow-oblong, with a groove on one side lined by a very narrow wing. Seed embryo type is straight

Seed collection and propagation

Collect seeds between December and January. Collect mature capsules, those that are turning brown or black but have not split, by hands or place small breathable bags over immature capsules or branchlets to collect maturing seed. Place the capsules in a tray and leave to dry for a weeks or two for them to split naturally. 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.

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 was supported by the Project Phoenix program.