The natural distribution of Eucalyptus species in Tasmania - Forestry ...

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Although E. barberi occurs as a mallee shrub or small tree in patches forming pure stands, it occurs more frequently as an understorey shrub in E. pulchella low, open woodlands. On these sites, E. globulus may also be present as a minor species, or E. ovata as drainage becomes slightly impeded. Eucalyptus barberi appears to be a relict species that may have been displaced from intervening wetter sites by competition from faster growing species (McEntee et al. 1994). The northern populations of E. barberi tend to be relatively large, but southern ones are particularly small and disjunct, and exhibit the greatest range in phenotypic variation. Many of these latter populations are of scientific interest (McEntee et al. 1994). COMMENTS: The disjunction in the geographic distribution of E. barberi may be Figure 10. Altitude distribution of E. barberi. n = 79 an artefact of the paucity of sampling due to small population sizes and relative inaccessibility (McEntee et al. 1994) rather than the absence of a suitable habitat. Several altitudinal outliers on the western margins of the main population need field verification. For example, occurrences at altitudes above 600 m are recorded from the upper catchments of the Brushy River (cell 5735) and the Douglas and Apsley Rivers (cell 5737). A low-altitude outlier (c. 100 m) to the north-west of the Grange Hills near Cranbrook (cell 5934) is also unverified. Other doubtful records include grid cells 5630, 5633 and 5634. Putative occurrences south of Bicheno (cell 6035) were not verified. However, a record for E. barberi from the vicinity of Donkeys Track Point near Three Thumbs (cell 5628) extends the southern population range (A. Gray, pers. comm. 1995). Other recent records in the Wielangta forests (cell 5727) have also extended the known range of the disjunct E. barberi populations in this region (F. Duncan and F. Coates, pers. comm. 1992). The populations on Meredith Tier (cell 5732) represent a hybrid swarm but are considered to be genetically closer to E. barberi than to any other single species (McEntee et al. 1994). Additional field verification of the northern and western range limits of E. barberi is needed to clarify its distribution and habitat. KEY REFERENCES: Barber (1954); Gray (1974); Johnson and Blaxell (1972); Ladiges et al. (1981, 1984); McEntee et al. (1994); Pryor and Briggs (1981). n = 40 Figure 11. Flowering times for E. barberi. Photo 3. Buds of E. barberi (pressed material). Tasforests Vol. 8 54 December 1996
Eucalyptus brookeriana SUBGENUS: Symphyomyrtus SERIES: Ovatae Common name: Brooker's gum Figure 12. Distribution of E. brookeriana in Tasmania. Inset map: Distribution on mainland Australia. Eucalyptus brookeriana has a broad geographic range and occurs locally in the warm, wet regions of the north-west, King Island and the east coast (Figure 12). It is usually located on well-drained, rocky soils of dolerite slopes and ridges, on alluvial deposits adjacent to streams, or on the margins of blackwoodswamp forest. Small, scattered, isolated populations exist between the two large, disjunct centres in eastern and western Tasmania. Many additional occurrences in pockets of suitable habitat between these population centres may be discovered. Eucalyptus brookeriana (Photos 4, 5) is the most recently described Tasmanian species (Gray 1979), and previous occurrences were classified as E. ovata. Jackson (1965) distinguished a western variant of E. ovata which may include forms currently classified as E. brookeriana. However, forms with affinities to E. ovata are also likely to occur in these western regions and E. brookeriana appears to intergrade with E. ovata across its range, further confusing the distinction between these two species. The two taxa are not well differentiated on reproductive traits, but the adult and juvenile Tasforests Vol. 8 55 December 1996
Page 1 and 2: The natural distribution of Eucalyp
Page 3 and 4: Figure 1. Species of Eucalyptus nat
Page 5 and 6: taken flora surveys of local land a
Page 7 and 8: obvious error and unverified observ
Page 9 and 10: Atlas of distributions of Tasmanian
Page 11 and 12: August to January, peaking around O
Page 13 and 14: Eucalyptus archeri SUBGENUS: Symphy
Page 15: Eucalyptus barberi SUBGENUS: Symphy
Page 19 and 20: and western populations, but may al
Page 21 and 22: comparatively high level of intrasp
Page 23 and 24: Eucalyptus cordata SUBGENUS: Symphy
Page 25 and 26: Photo 8. Regeneration of E. cordata
Page 27 and 28: Eucalyptus dalrympleana is a mid- t
Page 29 and 30: to north-east trend in the upper an

The natural distribution of Eucalyptus species in Tasmania - Forestry ...

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