My gourd plants have turned into vines. And, I have one white blossom with a pepo or baby gourd so far. I also got this book, Gourds in Your Garden, by Ginger Summit, which has been very helpful. I learned that:
1). Ornamental and luffa gourd plants bloom during the day and have yellow blossoms.
2). Hardshell gourds bloom at night and have white blossoms.3). Blossoms of all the vines last only 24 hours.
4). The vines have both female and male blossoms.