2 of the worst banes to any Aussie Gardener in the Aussie Outback, the 3 Cornered Jack prickles/thorns and Couch Grass.
A couple of mls of rain, a bit of warmer weather and they come up everywhere and almost anywhere as well.
3 Cornered Jacks can spread seeds almost by the ton, they can penetrate any shoe or boot and sting worse than a bee.
Couch grass, once it takes a hold is harder to get rid of than either an Uninvited Guest/squatter or your worst In-laws. It invades anything and everything, spreads everywhere across the surface as well as having deeply buried runners and produces seed as well.
Just spent an hour + spraying these 2 pests with my mix of herbicide, water and Dish washing liquid, an nice sunny day and now I'm hoping that within a week they'll starting to die off.
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North Texas has a couple similar plants. I had a bicycle when we first moved here but I could never keep the tires inflated after a ride. Patching holes from thorns from something that looked very similar to your 3 cornered jacks made the bicycle more of a chore than fun.
Johnson grass is a nightmare to have to deal with. It's a tall fast growing grass that gets its start from seed and then propagates by thick stolens that can grow at deep as a foot underground. I dug out some that were as thick as my thumb. I finally resorted to Round Up and endured dead patches in the yard until the chemical dissipated enough for the lawn grasses to fill in.
RussRAB
Level 8
Feb 23, 2021
0
We also get something kind of similar but smaller, it's called 'Love Grass' because of its seed heads having little hooks that stick to anything that brushes against it. then those little seed capsules use the 'hooks' to actually 'worm' their way in to clothing, skin, animal fur, etc, etc, causing horrible and often weeping sores, etc.
IF they get into the ears or eyes of animals they can and do often causes deafness and blindness if left unattended to.
Oh, bad memories. These are the pricker grass from the Sonoran desert in Arizona. The thorns stuck in your skin and caused terrible infections. One o the main reasons I hated Arizona.
Spinliesel
Level 9
Feb 22, 2021
0
The 3 cornered Jacks look wicked! 
Redheadedgammy
Level 9
Feb 22, 2021
3
In a good season they can grow to around 1.5 - 2 metres across, the plants themselves that is, with stems/runners going in every possible direction and always flat against the ground and almost nothing will eat the plants or the seed pods.
@Triphid sounds like the plant from hell!!
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