A Close-up View of Two Passion Flowers
   Photographic study by Brian Johnston of Passiflora caerulea and Passiflora coccinea, with many fine images, both macroscopic and microscopic.
   http://www.microscopy-uk.org.uk/mag/artsep06/bj-Passion-Flower.html

Czech Passiflora
   Includes flower images of cultivated specimens of many species.
   http://web.quick.cz/passiflora/

Passiflora Society International
   An organization for enthusiasts to exchange information, obtain help with plant identification, and to locate seeds and plants.
   http://www.passiflora.org/

Passiflora biflora
   
   http://florawww.eeb.uconn.edu/acc_num/199800107.html

Passiflora caerulea
   
   http://florawww.eeb.uconn.edu/acc_num/199800176.html

Passiflora capsularis
   
   http://florawww.eeb.uconn.edu/acc_num/199500133.html

Passiflora coriacea
   
   http://florawww.eeb.uconn.edu/acc_num/199200361.html

Passiflora edulis
   image
   http://www.botany.hawaii.edu/faculty/carr/images/pas_edu_fr.jpg

Passiflora foetida
   image
   http://www.botany.hawaii.edu/faculty/carr/images/pas_foe_fr.jpg

Passiflora ligularis
   image
   http://www.botany.hawaii.edu/faculty/cw_smith/images/pas_lig_cu.jpg

Passiflora manicata
   image
   http://www.botany.hawaii.edu/faculty/carr/images/pas_man.jpg

Passiflora mollissima
   image
   http://www.botany.hawaii.edu/faculty/cw_smith/images/pas_mol_fl2.jpg

Passiflora sanguinolenta
   
   http://florawww.eeb.uconn.edu/acc_num/199800014.html

Passiflora suberosa
   
   http://florawww.eeb.uconn.edu/acc_num/198500144.html

Passiflora trifasciata
   
   http://florawww.eeb.uconn.edu/acc_num/198501086.html

Passiflora vitifolia
   Photographs of the Vine Leaf Passion Flower, with cultural instructions.
   http://www.desert-tropicals.com/Plants/Passifloraceae/Passiflora_vitifolia.html