This is a common “weed,” White Clover or Dutch Clover (“Trifolium repens”). In some places it is regarded as invasive. Up close, though, it can take on some beauty.
Photo taken on the SIUC campus (but not in the greenhouse).
Not posted: Shots of a beetle (“Odontotaenius disjunctus” = “Horned Passalus”) that rode into the house on me this evening, http://bugguide.net/node/view/945939
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...
@espyetta Aww, thanks, MaryBeth! I passed up posting a photo of a rather large beetle. Here it is, if you're interested! “Odontotaenius disjunctus” = “Horned Passalus”: http://bugguide.net/node/view/945939.