Passiflora affinis, the bracted passionflower, is a species of flowering perennial vine of Texas and northeast Mexico. The vine has three-lobed leaves and a small yellow-green bloom with delicate filaments arranged in a starburst. It is a larval host plant for several butterfly species.
Passiflora affinis is a perennial climbing vine that can reach up to in length. Leaves have two to three rounded lobes and are broader than they are long, typically measuring wide and long with a petiole of .
Flowers grow singly or in pairs from the connection between petiole and stem. The flower is yellow-green overall and consists of 5 longer sepals alternating with 5 shorter petals underneath a disc of delicate filaments. P. affinis blooms July through August. The fruit is a purple-black berry.
Passiflora affinis is distributed across the Edwards Plateau geographic region of central Texas. It occurs in the following counties: Bandera, Bell, Bexar, Comal, Edwards, Fayette, Gillespie, Hays, Kerr, Kimble, Kinney, Llano, Sutton, Travis, Uvalde, and Val Verde. It is also found in northeast Mexico.
Passiflora affinis grows in the limestone soils common to the Edward's Plateau and prefers sun or partial shade.
Like other central Texas passionflower vines, Passiflora affinis is a larval host plant for the Gulf Fritillary and the Zebra Longwing. The caterpillars may completely defoliate the vine but if a plant is well established it is capable of growing back.