We have thousands of these 'moss roses' or portulaca. They have been reseeding themselves for around 10 years. They go down the front of our driveway bed and then around the sidewalk out to the driveway in front of the garage. My dh likes them but he gets a little panicky when they start popping up in the farm yard here and there down to the barn and around the machine sheds. And this is in full sun and lots of gravel. No water unless it rains. All colors. I try to tell him they are better than the wild purselane that grows all around here and is a pest in the veggie garden. We had these at the farm where I lived as a child in SD. One flower we never had to plant and could always rely on.

From my experience with Aloe arborescens, the red form is called Aloe arborescens. Here in So Cal that is the normal color. Red orange is common, too. Have not personally seen too many orange-flowering A arborescens. There is a pale yellow-flowering form, too, and it is often referred to as Aloe arborescens. Sometimes you can add the flower color name for emphasis, but I am not aware these different colored plants having unique names... that is not true for variegated plants and usually someone will have dreamed up a varietal name for those (usually it is 'Gold Rush' for Aloe arborescens).

Desert or Yellow Bird of Paradise, Caesalpinia gilliesii. They have them in one of the public gardens here and we just went from zone 7 to 8.

Cotula hispida