Introduced weeds of the Werribee River

Here’s a list I prepared for a talk on weeds at a tree planting day by the river. These are all species I have observed along the river in Bacchus Marsh. 

Bob Reid said he might see if he can make a list of native species from the river as long as this. It’s a very disturbed environment with a lot of invasive weeds!

Not all these are particularly problematic, many just colonising disturbed ground in the absence of natives. Bold indicates those that seem to be the main problem species.

There are undoubtedly more, especially grasses, rushes/sedges and aquatics which I am not confident to positively identify.

You can use the web links at the bottom of this post to look up colour photos of them and further information.

  1. African Boxthorn Lycium ferocissimum
  2. Artichoke Thistle Cynara cardunculus
  3. Blackberry Rubus fruticosus sp. agg.
  4. Blue periwinkle Vinca major
  5. Bridal Creeper Asparagus asparagoides
  6. Burr medic Medicago polymorpha
  7. Capeweed Arctotheca calendula
  8. Chilean Needlegrass Nasella neesiana
  9. Common thornapple Datura stramonium
  10. Common heliotrope Heliotropium europaeum
  11. Common sowthistle Sonchus oleraceus
  12. Cootamundra Wattle Acacia baileyana
  13. Cotoneaster Cotoneaster sp.
  14. Couch Grass Cynodon dactylon
  15. Desert Ash Fraxinus rotundifolia
  16. Fat Hen Chenopodium album
  17. Fennel Foeniculum vulgare
  18. Galenia Galenia pubescens
  19. Great Mullein Verbascum thapsus
  20. Hemlock Conium maculatum
  21. Horehound Marrubium vulgare
  22. Ivy Hedera helix
  23. Khaki Weed Alternanthera pungens
  24. Kikuyu Grass Pennisetum clandestinum
  25. Montpellier Broom Genista monspessulana
  26. Onion grass Romulea rosea
  27. Paspalum Paspalum dilatatum
  28. Paterson’s Curse Echium plantagineum
  29. Peppercorn Tree Schinus molle
  30. Phalaris Phalaris aquatica
  31. Prickly Pear Opuntia stricta
  32. Prickly Lettuce Lactuca serriola
  33. Serrated Tussock Nasella trichotoma
  34. Small-flowered Mallow Malva parviflora
  35. Soursob Oxalis pes-caprae
  36. Thistles (probably several species)
  37. Sticky Cape Gooseberry Physalis viscosa
  38. Stickyweed/Cleavers Galium aparine
  39. Sweet Briar Rosa rubiginosa
  40. Variegated thistle Silybum marianum
  41. White Clover Trifolium repens
  42. Wild Teasel Dipsacus fullonum
  43. Wild Oat Avena fatua
  44. Willow species uncertain

Weed resources online

http://www.weeds.org.au/

http://www.environment.gov.au/biodiversity/invasive/weeds/

http://www.depi.vic.gov.au/agriculture-and-food/pests-diseases-and-weeds/weeds

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