I took this picture. I have discovered they are Double Late Tulip Monsella, which this page seems to confirm. They were in front of my (old) rental house in Arvada, Colorado.
Per the license, please provide attribution that I was the creator and a link to my Wikipedia user page at: http://en.wikipedia.org/wiki/User:Mecu or w:User:Mecu. Something along the lines of "Photo by MECU" is preferred. "MECU" should be in all caps. Note: my username is not all caps, just the way I like it displayed.
Lîsans
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parve bike – ji bo kopîkirin, belavkirin û weşandina xebatê
ji bo guhartin û adaptekirina naverokê – ji bo adaptekirina xebatê
Di bin van mercan de:
isnad – Divê tu isnadeke maqûl bikî, lînekek pêşkêş bikî ji bo lîsansê, û diyar bikî ku guhartin hatiye kirin an na. Tu dikarî vê yekê bi adilî bi cih bînî, lê ne bi awayê ku wekî lîsansor te an bikaranîna te pejirandibe.
parvekirinê mîna hev – Ger tu materyalê biguherînî, bizivirînî formeke din, an ava bikî divê beşdariyên xwe di bin eynî lîsansê an lîsansa hevaheng de wekî ya eslî belav bikî.
{{Information |Description=Monsella Tulips |Source=Self work |Date=2006-04-22 |Author=MECU (self) |Permission= }} I took this picture. I have discovered they are "Tulip Monsella", which [http://www.brecks.com/product.asp?pn=67422&bhcd2=1175