26
Mark Burgman et al.
A. newbeyi habitat is restricted to one kind of landscape (laterite hills), and its
distribution is restricted. It is relatively nondescript, and the absence of collections
in 1985 is probably due mainly to the death of an active collector in the region.
A. phaeocalyx was described in 1978 and was last collected in 1983. It is
distinctive (albeit small and spiny) and is not uncommon within its range. It is
unlikely to be at risk.
A. prismifolia is known from three collections (two in 1901 and one in 1933),
and it is presumed to be extinct.
A. pygmaea is rare and is confined to a single small population in the Wongan
Hills of Western Australia. There have been no collections since 1980, perhaps
because the population is well known and experienced collectors have avoided
affecting it by taking further collections. In addition, any more collections may be
discarded because they come from the same population and may therefore be
considered geographically and taxonomically uninformative.
A. richardsii is a medium-sized Acacia species with a scattered distribution
across a moderate geographic range and was collected frequently up to 1989 and
not since. The species is probably not in need of urgent attention. It occurs in a
remote area of the Kimberleys. Variation in collection frequency is most likely
related to the timing of regional surveys.
A. semicircinalis is endemic to the Wongan Hills, but unlike A. pygmaea, it is
common within its range. It is an insubstantial plant with a prostrate wiry habit
and few flowers. Most collections originate from the period in the 1970s and
1980s during which it was described and during which a botanical survey of the
hills was undertaken. These activities are likely to be responsible for the nonrandom collection pattern. It is unlikely to be in need of urgent attention. Variation
in collection frequency is likely to be due to variation in taxonomic interest, the
timing of regional surveys, and the fact that subsequent collections may have been
discarded as uninformative.
A. subrigida has only been collected three times, between 1979 and 1982. Its
range is remote and poorly collected. The collections were all made by specialists.
The species is unlikely to be in need of urgent attention.
Mark Burgman et al.
A. newbeyi habitat is restricted to one kind of landscape (laterite hills), and its
distribution is restricted. It is relatively nondescript, and the absence of collections
in 1985 is probably due mainly to the death of an active collector in the region.
A. phaeocalyx was described in 1978 and was last collected in 1983. It is
distinctive (albeit small and spiny) and is not uncommon within its range. It is
unlikely to be at risk.
A. prismifolia is known from three collections (two in 1901 and one in 1933),
and it is presumed to be extinct.
A. pygmaea is rare and is confined to a single small population in the Wongan
Hills of Western Australia. There have been no collections since 1980, perhaps
because the population is well known and experienced collectors have avoided
affecting it by taking further collections. In addition, any more collections may be
discarded because they come from the same population and may therefore be
considered geographically and taxonomically uninformative.
A. richardsii is a medium-sized Acacia species with a scattered distribution
across a moderate geographic range and was collected frequently up to 1989 and
not since. The species is probably not in need of urgent attention. It occurs in a
remote area of the Kimberleys. Variation in collection frequency is most likely
related to the timing of regional surveys.
A. semicircinalis is endemic to the Wongan Hills, but unlike A. pygmaea, it is
common within its range. It is an insubstantial plant with a prostrate wiry habit
and few flowers. Most collections originate from the period in the 1970s and
1980s during which it was described and during which a botanical survey of the
hills was undertaken. These activities are likely to be responsible for the nonrandom collection pattern. It is unlikely to be in need of urgent attention. Variation
in collection frequency is likely to be due to variation in taxonomic interest, the
timing of regional surveys, and the fact that subsequent collections may have been
discarded as uninformative.
A. subrigida has only been collected three times, between 1979 and 1982. Its
range is remote and poorly collected. The collections were all made by specialists.
The species is unlikely to be in need of urgent attention.