Don't know. The flowers aren't in a clear enough view for me to be certain, but they appear to put this plant in the nightshade family (Solanaceae).

It looks like something from the edible squash family to me.

My mom said she thought it might be squash too, which is why I have left it there. I wanted to see what it did. When I saw the buds forming I thought they might be squash, but then they were just flowers!

First the flowers then the squash if that's what it is.

I still say nightshade family. Look at the inflorescence, not just the open flowers. When have you ever seen squash blossoms in a cluster that looks like a dead ringer for a cluster of weird tomato flowers? When you ever seen developing squash flower buds that looked so much like developing tomato flower buds?

york rose, I have never grown any vegetables so I wouldn't know what any of them look like. Are you saying you think it is a tomato variety?

I have never saw a squash plant with thorns so I rule that out. The leaves appear to be like those of a watermelon but alas watermelons do not have thorns. Maybe it's a Texas weed?

York Rose is right on the money. Check out this solanum linnaeanum-not exact but close. Your weeds sure look happy!

{{gwi:293390}}

Here is a link that might be useful: More Info

I don't think it's a squash or watermelon due to the thorns.
If the flowers aren't followed by small fruits I'd say it's a target for roundup.

Around here we call it sand burr. I don't know if that is the "real" name or not - but DO NOT LET IT GROW!! It will spread like crazy, and you'll never get rid of them. It's not an actual noxious weed in these parts, but it should be in my opinion.

My local Horse Nettle has those flowers, but leaves that are 'entire'.
My first thought on seeing your leaves was one of the melons, but the thorns knock out the possibility of it being a melon; that and it's growth habit, and blooms.

The roots are horrible, spreading underground by runners three to six inches down. And the thorns stay sharp as long as they exist. (You don't have to ask how I know this.)

Get rid of it now. You don't want the seeds to mature or the roots to get into any soil you might ever use.

Thanks for the info! I'll pull it tomorrow. I guess I'll dig it up since the thorns are so nasty I know they will go through any pair of gloves I have. I find it strange that I have this weed. It came up between 2 of my roses. I never, ever get any weeds in my rosebed. I have no idea why since I don't do anything to prevent them - I don't even mulch. So I have this long rosebed with 14 roses in it and this one weed that does indeed look very happy! I wish my roses were as happy as the weed.

Someone over on the vegetable board posted this link. It is definitely what I have. It must hurt like crazy if it punctures the skin. I have noticed just when I touched the thorns, but I wasn't stuck by them, that I thought I felt a slight stinging that went away very quickly. I can't imagine what it would do if it actually stuck me!

http://fireflyforest.net/firefly/2006/07/24/buffalobur-nightshade-a-very-evil-plant/

Good call, yorkrose! Aggierose, glad you got it figured out before any damage was done.

FWIW, tomatoes are in the nighshade family, and that is probably why it looked vaguely vegetable-like.

Yorkrose got it, Solanum rostratum, Buffalo Burr. Bravo Yorkrose!

Here is a link that might be useful: {{gwi:283793}}

Are you saying you think it is a tomato variety?

No, I'm saying that other plants in the nightshade family (as tomatoes are) also have inflorescences that are visually similar to tomato inflorescences (although not identical). The squashes are in a separate family (Cucurbitaceae) and their inflorescenes are also recognizable, but they look differently from this plant's.

(Thanks for the compliments, folks. :-))