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I have a weed in my lawn which is prolific where the grass is of low height. It is a very small clover with yellow flowers.

I live in the Sydney, Australia region.

Here's a photo with a ruler to scale:

enter image description here

1 inch = 2.54 centimeters

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up vote 7 down vote accepted

I believe what you have there is Yellow Woodsorrel (Oxalis stricta).

If it isn't, I'm 90 to 95% certain it's in the Oxalis genus, which Yellow Woodsorrel belongs to...

Kudos to Lisa for the local Down Under information:

  • Where I come from (SA) it's called "Soursob" and as far as I know its binomial name is Oxalis pes-caprae. It is an extremely well known weed throughout the agricultural regions of Australia and some studies identify it as a health risk for grazing livestock. You can use it as a herb apparently, though most people spend countless hours of their lives trying to kill it!

  • From 891's Talkback Gardening with Jon Lamb and Ashley Walsh podcast, listen to the below show as the Aussie gardening superstars talk about dealing with soursobs (and hopefully similar species in Oxalis genus). Listen at 22:30 and 32:23.

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Thank you so much! Now i can target it with the right treatment. –  Valamas Oct 11 '11 at 4:09
    
@Valamas No worries and good luck... –  Mike Perry Oct 11 '11 at 4:16
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Where I come from (SA) it is called soursob and as far as I know its binomial name is Oxalis pes-caprae. It is an extremely well known weed throughout the agricultural regions of Australia and some studies identify it as a health risk for grazing livestock. You can use it as a herb apparently, though most people spend countless hours of their lives trying to kill it! –  Lisa Oct 11 '11 at 7:23
1  
@Lisa this podcast link: abc.net.au/adelaide/features/garden.xml -- is on that page, is it not correct? –  Mike Perry Oct 11 '11 at 23:11
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@Valamas Dealing with soursobs (and hopefully similar species in Oxalis genus) at 22:30 mins in: mpegmedia.abc.net.au/local/adelaide/201108/r819626_7412696.mp3 –  Lisa Oct 12 '11 at 0:26
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