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Found in greenhouse in tangle of webs.
Cardboard box inside greenhouse.
Many of these spiders in the same area with cobwebs everywhere in no specific pattern.
This is a pregnant female.
Here's a link to a map from Bug Guide. It shows the range of the different species of recluse spiders. Based on body type and leg arrangement, I agree that your spider is one.
http://bugguide.net/node/view/33527
I can't quite see the defining "fiddlehead" on your spider (possibly due to photo lighting - I think it is there), but you live within the range for Brown Recluses, and the abdomen and overall coloration look right for that spider.