Flora survey for Hamersley Drive recreation - Environmental ...

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FRNP Improvement Project: Culham Inlet to Hamersley Inlet GF Craig– July 2010 No. Plants % EMB population 12 % all populations Hamersley Drive upgrade 42 1.2 1.2 East Mt Barren 3580 Eucalyptus coronata Crowned Mallee (Vulnerable) The Crowned Mallee is a small multi-stemmed, smooth-barked mallee up to 2.5 m high, with bluishgreen leaves 12 cm long and 3 cm wide. Strongly ribbed buds occur in threes on a broad flattened stalk. The large fruits have a broad disc and domed, protruding valves that look like a crown. Prior to this survey E.coronata was recognised to occur in 4 populations, from East Mt Barren, Eyre Range, Whoogarup Range and Mid Mt Barren. The total plant numbers was estimated at 215, with 150 of these plants known from East Mt Barren, within 2 sub-populations 1A on the eastern slopes consisting of 100 plants and 1B the summit consisting of 50 plants. Ellen Hickman’s survey amended the population number on East Mt Barren to approximately 2000 plants, with 461 plants actually waypointed. Nine plants identified within the 25 m road buffer. Therefore the plants deemed to be under threat from the proposed road works constitutes 0.5% of the entire population on East Mt Barren. Since populations 1A and 1B merge on the southern slopes of East Mt Barren the division into sub-populations is irrelevant. Specific comments on each population are presented in Appendix 4. E.burdettiana and E.coronata population overlap near the summit and on the south-eastern slopes of East Mt Barren. No. Plants % EMB population % all populations Hamersley Drive upgrade 9 0.45%
FRNP Improvement Project: Culham Inlet to Hamersley Inlet GF Craig– July 2010 Stylidium galioides – Yellow Mountain Triggerplant (Vulnerable) Endemic to the Eyre Range, a plant with trailing stems that apparently roots at the nodes, which makes it difficult to count the number of plants in a population/area. It is common on East Mt Barren and during the eucalypt survey Ellen Hickman observed S. galioides along the walk trail to the summit, all over summit, on the south-eastern face above Hamersley Drive, on the north-eastern face up into the gully directly below the summit and in the gully on west side of East Mt Barren. Along Hamersley Drive, S. galioides occurs from the western slopes of East Mt Barren to the eastern carpark on the wave-cut bench, preferring shallow soil amongst outcropping quartzite. Although the table below indicates a significant percentage of plants would be impacted, the widespread occurrence of S. galioides on East Mt Barren suggests that in reality only a very small percentage of plants will be affected by the road upgrade. % EMB population % all populations Hamersley Drive upgrade 500+
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Flora survey for Hamersley Drive recreation - Environmental ...

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