Rippey, Hislop & Dodd: Vascular flora of Rottnest Island 
Table 1 
Native and introduced species, annual and perennial, recorded on Rottnest Island in the late 1950s and between 1998 and 2001. 
Late 1950s 1 
Native Introduced Total 
1998-2001 2 
Native Introduced Total 
Annual 
29 
54 
83 
22 
50 
72 
Perennial 
89 
18 
107 
83 
30 
113 
Annual or Perennial 
6 
5 
11 
8 
3 
11 
Total 
124 
77 
201 
113 
83 
196 
1 Centaurium, Comesperma, Cotiostylis, Rhagodia and Senecio were counted as one species each. 
2 Anagallis and Senecio for which two varieties or subspecies were collected were counted as one species each. 
be present before and after Storr's (1962) census, were 
assumed present, as were 4 orchid and 6 seagrass species 
that were not recorded in the 1950s. 
The cumulative total number of vascular plant 
species recorded for Rottnest Island, including those 
that have become extinct, was 246 (Anagallis, Eremophila, 
Rhagodia and Senecio counting as one species each). One 
hundred and thirty-five were native species (55%) and 
111 (45%) were introduced. These species are listed in 
Appendix 2. 
Table 2 
Species that became extinct or immigrated between the two censuses. (We acknowledge that some species listed could have been 
overlooked, misidentified or were dormant at the time of one or other census. Native species are perhaps less likely to have immigrated 
than aliens, and annuals less likely to have become extinct than perennials. Geranium molle, for example, was rediscovered in 2002). 
Extinctions 
Exotics 
Agave sisalana 
Arctolheca populifolia 
Brotnus madritensis 
Carduus pycnoceplmlus 
Centaurium pulchellum 
Chenopodium murale 
Crassula natans 
Desntazeria rigida 
Heliophila pusilla 
Diplotaxis muralis 
Ehrharta brevifolia 
Geranium molle 
Juncus bufonius 
Leucojum aestivum 
Lolium rigidum 
Malva parviflora 
Medicago polymorpha 
Orobanche minor 
Parentucellia latifolia 
Pennisetum clandestinum 
Reseda luteola 
Silene noctuma 
Sisymbrium orientale 
Tetragonia decumbens 
Trifolium suffocatum 
Natives 
Bulbine semibarbata 
Centrolepis polygyna 
Comesperma confer turn 
Comesperma integerrimum 
Do4onea aptera 
Heliotropium curassavicum 
Hemichroa pentandra 
Hydrilla verticillata 
Juncus kraussii ssp australiensis 
Malva australiana 
Myosotis australis 
Pelargonium littorale ssp littorale 
Immigrations 
Exotics (including species that naturalised) 
Agave attenuata 
Avellinia michelii 
Caesalpinia gilliesii 
Callitriche stagnalis 
Casuarina glauca 
Cerastium balearicum 
Cirsium vulgare 
Crassula glomerata 
Crassula thunbergiana ssp thunbergiana 
Cymbalaria muralis 
Eragrostis curvula 
Eucalyptus utilis 
Euphorbia paralias 
Ficus rubiginosa 
Hedypnois rhagadioloides 
Iris sp. 
Lycopersicon esculentum 
Malva dendromorpha 
Melia azedarach 
Minuartia mediterranea 
Phyllangium paradoxum 
Polypogon tenellus 
Poranthera drummondii 
Portulaca oleracea 
Trachymene pilosa 
Wurmbea monantha 
Zygophyllum billardierei 
Moraea flaccida 
Narcissus tazetta 
Nerium oleander 
Oxalis pes-caprae 
Raphanus raphanistrum 
Rhamnus alatemus 
Romulea rosea var australis 
Solanum nigrum 
Vulpia fasciculata 
Vulpia muralis 
Natives 
Angianthus preissianus 
Anthocercis littorea 
Austrostipa elegantissima 
Calandrinia aff eremaea Ruppia tuberosa 
Centaurium spicatum Schoenus nitens 
Lachnagrostis filiformis 
9 
