Can't help with the grasses, but the last one is spurge. If it keeps coming up in the same places, it's because there are thousands of seeds ready to sprout at any opportunity.
Pat, thanks for info about spurge! Glad also to learn that it is poisonous. Most plants with white sap seem to be poisonous to some degree. I once got white sap from a candelabra cactus in my eye and within a few minutes I started having trouble breathing. Ended up at the ER, but all they could do was keep flooding eyes with water. $500 later everything was back to normal.
While I doubt the generalisation that white sap equals poison is always true, like many domesticated plants the lettuce has been bred from an ancestor that was much less tasty than the modern version. The wild lettuce is quite bitter which you get with some modern cultivars under some conditions, such as when they get old and going to seed. There are reports that it is not entirely benign, see:
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A great many plants evolved nasty tasting and irritating components to deter would-be feeders. Some we have bred to be less pungent in taste others we have allowed to keep their strong flavour and now call them herbs and spices.
I was gonna make a smart-alec remark that the first 2 are grass and the last was a weed, and HTH. But they *might* be sedges instead of grass and then wouldn't I be embarrassed. (I'm pretty sure they are annual grasses)
The last one is prostrate spurge, Euphorbia supina or Euphorbia maculata.
Thanks a lot for the info Kay! That's exactly what it is! Neighbors have all said it was candelabra that I never checked. It was about
10-ft in height 20 years ago and is still growing. Now 17 to 18 ft. Trunk is 15-in diameter near the base.
Simliar to this one...
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From wikipedia...
Euphorbia canariensis, commonly known as the Canary Island spurge or the Hercules club,[5] is a succulent member of the family Euphorbiaceae and genus Euphorbia[1] endemic to the Canary Islands.[6]
The Canary Island spurge is a small tree, growing to between 3 and 4 metres (9.8 and 13 ft) high. It is made up of fleshy quadrangular or pentagonal trunks that look like cacti. The leaves grow in clusters of three or four and have inward-turning spines 5 to 14 millimetres (0.20 to 0.55 in) long. It produces reddish-green flowers.[6] It is hardy to
-2 °C (28 °F).[7]
*** The latex, which contains diterpenes[8] is considered highly toxic.
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