by CKR
My datura bloomed this past week. Unfortunately, by the time I managed to get a photo, it was saggy. They last only for a day. 
Temperatures have been in the nineties for the past several days, so it might have been too dry, although the leaves were turgid.
Another bud is on its way. 
Datura is a poisonous plant, in the Solonaceae family along with potatoes, tomatoes, and deadly nightshade. If you look at the flowers of all those different kinds of plants carefully, you will see that they all have similar shapes, even though they are of different sizes.
Most summers bring one or two reports of kids being poisoned by Datura seeds, hoping to get high. The seeds are supposed to be hallucinogenic, but the difference between visions and serious illness, even death, seems to be small.
Datura share that purply tinge with deadly nightshade. Georgia O'Keeffe painted a few of them. Here's one (source). 
And, just for good measure, a beeplant and a Missouri evening primrose. The first time I saw one of these evening primroses, with teacup-sized flowers in a Grand Canyon campground, I was overwhelmed. These are the kind of flowers the guidebooks like.
The Southwest Exotic Plant Information Clearinghouse lists invasive weeds of the southwest, but it's still not the guide I'm looking for. It gives lists of exotic (nonnative) weeds by state, with photos and other links.