Table 3.1
Signature plant taxa in four alien plant species assemblage zones defined based on the ratio of number of occupied quarter-degree cells (QDGCs)
within the zones to the total number of occupied cells
Alien plant species assemblages
Signature taxa
Fynbos-specific invaders
Acacia saligna
(Port Jackson Willow); Acacia cyclops
(Rooikrans); Pinus pinaster
(Cluster Pine); Pinus radiata
(Monterey Pine); Hakea sericea
(Silky Hakea); Paraserianthes lophantha
(Stinkbean); Avena
sp. (Wild Oats);
Eucalyptus cladocalyx
(Sugar Gum); Eucalyptus diversicolor
(Karri); Leptospermum laevigatum
(Australian Myrtle)
Moist subtropical invaders
Psidium guajava
(Guava); Senna didymobotrya
(Peanut Butter Cassia); Biancaea decapetala
(Mauritius Thorn);
Chromolaena odorata
(Triffid Weed); Catharanthus roseus
(Madagascar Periwinkle)
Semi-arid invaders
Prosopis glandulosa
(Mesquite); Salsola kali/tragus
(Tumbleweed)
Grassland-specific invaders
Pyracantha angustifolia
(Yellow Firethorn); Cosmos bipinnatus
(Cosmos); Robinia pseudacacia
(Black Locust); Rosa
rubiginosa
(Eglantine); Acacia decurrens
(Green Wattle); Salix fragilis
(Crack Willow)
Pervasive/riparian invaders
Opuntia
ficus-indica (Mission Prickly Pear); Melia azedarach
(Syringa); Salix babylonica
(Weeping Willow); Populus x
canescens
(Grey Poplar) Acacia mearnsii
(Black Wattle); Ricinus communis
(Castor-oil Plant); Agave americana
(American agave); Arundo donax
(Spanish Reed); Prunus persica
(Peach) Argemone ochroleuca
(White-flowered
Mexican Poppy); Sesbania punicea
(Sebania); Cirsium vulgare
(Spear Thistle); Nicotiana glauca
(Tree Tobacco);
Solanum mauritianum
(Bugweed); Acacia dealbata
(Silver Wattle); Opuntia robusta
(Wheel Cactus); Lantana
camara
(Lantana); Datura stramonium
(Common Thorn Apple) Verbena bonariensis
(Purpletop); Schinus molle
(Peruvian Peppertree)
Signature taxa for each assemblage were arbitrarily defined as those that occur in at least 25% of QDGCs in the zone and for which the occupancy ratio exceeds
0.75. Also listed are taxa that do not qualify as signature taxa, but which are widespread in South Africa (i.e. occurring in at least 15% of the QDGCs covered by
the SAPIA database). Taxa are listed in decreasing order of the number of QDGCs occupied within each zone
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Signature plant taxa in four alien plant species assemblage zones defined based on the ratio of number of occupied quarter-degree cells (QDGCs)
within the zones to the total number of occupied cells
Alien plant species assemblages
Signature taxa
Fynbos-specific invaders
Acacia saligna
(Port Jackson Willow); Acacia cyclops
(Rooikrans); Pinus pinaster
(Cluster Pine); Pinus radiata
(Monterey Pine); Hakea sericea
(Silky Hakea); Paraserianthes lophantha
(Stinkbean); Avena
sp. (Wild Oats);
Eucalyptus cladocalyx
(Sugar Gum); Eucalyptus diversicolor
(Karri); Leptospermum laevigatum
(Australian Myrtle)
Moist subtropical invaders
Psidium guajava
(Guava); Senna didymobotrya
(Peanut Butter Cassia); Biancaea decapetala
(Mauritius Thorn);
Chromolaena odorata
(Triffid Weed); Catharanthus roseus
(Madagascar Periwinkle)
Semi-arid invaders
Prosopis glandulosa
(Mesquite); Salsola kali/tragus
(Tumbleweed)
Grassland-specific invaders
Pyracantha angustifolia
(Yellow Firethorn); Cosmos bipinnatus
(Cosmos); Robinia pseudacacia
(Black Locust); Rosa
rubiginosa
(Eglantine); Acacia decurrens
(Green Wattle); Salix fragilis
(Crack Willow)
Pervasive/riparian invaders
Opuntia
ficus-indica (Mission Prickly Pear); Melia azedarach
(Syringa); Salix babylonica
(Weeping Willow); Populus x
canescens
(Grey Poplar) Acacia mearnsii
(Black Wattle); Ricinus communis
(Castor-oil Plant); Agave americana
(American agave); Arundo donax
(Spanish Reed); Prunus persica
(Peach) Argemone ochroleuca
(White-flowered
Mexican Poppy); Sesbania punicea
(Sebania); Cirsium vulgare
(Spear Thistle); Nicotiana glauca
(Tree Tobacco);
Solanum mauritianum
(Bugweed); Acacia dealbata
(Silver Wattle); Opuntia robusta
(Wheel Cactus); Lantana
camara
(Lantana); Datura stramonium
(Common Thorn Apple) Verbena bonariensis
(Purpletop); Schinus molle
(Peruvian Peppertree)
Signature taxa for each assemblage were arbitrarily defined as those that occur in at least 25% of QDGCs in the zone and for which the occupancy ratio exceeds
0.75. Also listed are taxa that do not qualify as signature taxa, but which are widespread in South Africa (i.e. occurring in at least 15% of the QDGCs covered by
the SAPIA database). Taxa are listed in decreasing order of the number of QDGCs occupied within each zone
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D. M. Richardson et al.