Current and Potential Geophyte Weeds of Western Australia

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Current and Potential Geophyte Weeds of Western Australia

Current and Potential

Geophyte Weeds of

Western Australia

Greg Keighery


Brachychiton populneus


BULBS

Western Geophyte Weeds

ALLIACEAE (ONIONS) - 6

AMARYLLIDACEAE - 9

COLCHICACEAE - 1

HYACINTHACEAE - 9

CORMS

IRIDACEAE - 50

TECOPHILACEAE ñ 1

CORMS/TUBERS/BULBS/RHIZOMES

OXALIDACEAE - 12

TUBERS

ALSTROEMERIACEAE - I

TUBEROUS RHIZOMES

ALISMATACEAE - 2

ARACEAE - 4

ASPARAGACEAE - 6

ASPHODELEACEAE - 2

IRIDACEAE ñ 2

JUNCAGINACEAE - 1

NYMPHACEAE - 2

ORCHIDACEAE - 1

PASSIFLORACEAE - 1

PHYTOLACCACEAE - 1

STERCULIACEAE - 1


Geophyte Weeds of Western

Australia

ï 112 geophytic species from 18 familes

ï Monocots and Dicots

ï nearly half are cormous Iridaceae from

southern Africa

ï Largely introduced as ornamentals


Number of Geophyte Weeds

in the

WA Biogeographic Regions

52


WHY?

Temperate Geophytes

Southern Africa 8,550 species 1500 (17%)

Mediterranean 25,000 species c. 700

California 4400 species c. 200

Central Chile 2400 species c. 200

SW WA 5700 species 100/200 ( 4%)


Tropical Geophytes

ï Tropical Africa

ï Gladiolus 82 species

ï South America over 300 species

ï Crinum 50

ï Hippeastrum 76

ï Hymenocallis 70

ï Habranthus 55

ï Nothoscordium 30

ï Zephryanthes 60


Hippeastrum puniceum


ìWorstî Geophyte Weeds

ï Hyacinthaceae : Lachenalia

ï Araceae: Zantedeschia (Arum Lily)

Asparagaceae: Asparagus

ï Iridaceae: Babiana, Freesia, Gladiolus,

Moraea, Romulea, Sparaxis and

Watsonia

ï Oxalidaceae: Oxalis


Most soils

Freesia


Moraea flaccida

Gladiolus

caryophyllaceus

Sandy

soils


Sandy soils

Lachenalia


Sandy and

calcareous soils


Damplands/Alluvial soils

ï Watsonia species

ï Babiana angustifolia

ï Sparaxis bulbifera

ï Zantedeschia aethiopica

ï Gladiolus undulatus


Gladiolus undulatus

Damplands

Moraea lewisiae


Preventing Future

Weeds Stop escape

Track and remove


ï Limit spread

Limit spread

Remove outliers


Limit genetic

variation


Conclusions

ï Currently largely confined to the wetter

south west, but actively expanding their

ranges

ï Few recorded for the Kimberley or Desert

regions BUT numerous species occur overseas

in similar climates and several are locally

naturalised on offshore islands (Cocos

Christmas and Koolan).

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