A diminutive passionvine

Passiflora lutea on porch railing

Passiflower lutea, a native passionflower, is delicate compared to its relative P. incarnata (Maypops).

Passiflora lutea flowers

Its small flowers are star-like -- ours is now in flower but I didn't get a shot last weekend.  This image is from Missouri Plants.com.

This plant has been doing great this year!  (Here's a view from earlier in the season).