02344nas a2200217 4500008004100000245005000041210005000091300001200141490000700153520176400160653001201924653001001936653002101946653001501967653001501982653002201997100002402019700001502043700001802058856005002076 1997 eng d00aPlants of Western Australian granite outcrops0 aPlants of Western Australian granite outcrops a141-1580 v803 a

Outcropping granite rocks in Western Australia span a considerable climatic range, from the mediterranean south-west to inland desert and northern arid subtropics and tropics. At least 1320, and possibly 2000, plant taxa occur on Western Australian granite outcrops. Outcrop plant life is most diverse in the South West Botanical Province, with individual outcrops having up to 200 species, including many endemics not found in surrounding habitats. Species richness and local endemism declines with increasing aridity, to the point where Kimberley and Pilbara outcrops show little discontinuity in species from the surrounding landscape matrix. Outcrops are dominated by woody and herbaceous perennials, especially of the Myrtaceae, Orchidaceae, and Mimosaceae, and have an unusually rich diversity of annuals (Asteraceae, Stylidiaceae, Poaceae, Amaranthaceae etc.) compared with the flora as a whole. An unusual life form is found in resurrection plants capable of extreme desiccation and rehydration (e.g. Borya, Cheilanthes). Among woody perennials, bird pollination is frequent, and some outcrops harbour a high proportion of obligate seeder species due to the refuge from fire provided by bare rock barriers. The diversity of microhabitats and soil moisture regimes on outcrops has enabled the persistence of species beyond their main range in the face of climatic fluctuations. It has also facilitated the evolution of many endemics in the south-west. Major threatening processes facing outcrop plant communities include weed invasion, grazing by stock and feral animals, too-frequent fire, clearing, loss of shrub layer, salinity, and dieback. Conservation of these rich rare habitats needs the support of local communities.

10aannuals10aflora10agranite outcrops10aTriglochin10avegetation10aWestern Australia1 aHopper, Stephen, D.1 aBrown, A P1 aMarchant, N G uhttps://juncaginaceae.myspecies.info/node/16100676nas a2200157 4500008004100000245008100041210006900122300001200191490000700203520016800210653001800378653002700396653002200423100002400445856004900469 1999 eng d00aTriglochin protuberans (Juncaginaceae): a new species from Western Australia0 aTriglochin protuberans Juncaginaceae a new species from Western  a215-2160 v123 a

Triglochin protuberans Aston sp. nov., an annual species from south-western West Australia, is described and its diagnostic features illustrated.

10aJuncaginaceae10aTriglochin protuberans10aWestern Australia1 aAston, Helen Isobel uhttps://juncaginaceae.myspecies.info/node/17