Morrow's Honeysuckle (Lonicera morrowii)

4/31/06 White Clay State Park, DE
A bush honeysuckle and Oriental invasive.
Older flowers become cream colored.
Natives have solid stems, invasives have hollow stems.

http://nbii-nin.ciesin.columbia.edu/ipane/icat/browse.do?specieId=69
"One way to differentiate between the invasive bush honeysuckles and the native ones is that the invasive honeysuckles all have hollow stems, while the stems of the native ones are solid."

also:
http://www.illinoiswildflowers.info/trees/plants/morrow_hs.htm

http://plants.usda.gov/java/profile?symbol=LOMO2&photoID=lomo2_2h.jpg
So invasive it's prohibited or banned in some states!