The majority of Cuscuta photos that are posted worldwide online belong to only a few species: Cuscuta campestris, C. epithymum, C. europaea, C. gronovii, C. pacifica (reported as C. salina). Considering that many Cuscuta sp. are known only from their type specimens or they are very rare (or even extinct), finding photos of living plants for all the taxa listed below is an impossible job, and anyway, if you want to identify a Cuscuta spp. you must use the basic morphology galleries.

In general, I linked directly to the online source. Please make sure that you respect the rules of the website/owner of the images. I am only making sure that the identity of the taxon illustrated is correct. The list of species below is not a synopsis of the genus (I may have missed some good species). 

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Various photos with Cuscuta spp. in their habitat, and sometimes the people hunting them

Alphabetical list of species

Cuscuta acuta Engelm.

Cuscuta acutiloba Engelm.

Cuscuta abyssinica Richard

Cuscuta africana Thunb.: Phytoimages

Cuscuta alata Brandegee

Cuscuta americana L.: Phytoimages; Flickr (K. Bradley)

Cuscuta andina Phil.

Cuscuta angulata Engelm.: Phytoimages

Cuscuta appendiculata Engelm. 

Cuscuta approximata Bab.: Plantarium; Parasitic Plant Connection

Cuscuta argentinana Yunck.

Cuscuta aristeguietae Yunck.

Cuscuta australis R. Br.: Parasitic Plant Connection

Cuscuta babylonica Aucher ex Choisy: Parasitic Plant Connection

Cuscuta balansae Boiss. & Reut. ex Yunck.: Parasitic Plant Connection

Cuscuta bifurcata Yunck.

Cuscuta bella Yunck.

Cuscuta blepharolepis Welw. ex Hiern.

Cuscuta boldinghii Urb.: Botanypictures.com

Cuscuta boliviana Yunck.

Cuscuta bonafortunae Costea & I. Garcia: Phytoimages

Cuscuta brachycalyx (Yunck.) Yunck.: CalPhotos

Cuscuta bracteata Yunck. 

Cuscuta brevistyla Braun

Cuscuta chapalana Yunck.: Phytoimages

Cuscuta californica Hook. & Arn.: CalPhotos 

Cuscuta campestris Yunck.: Parasitic Plant Connection; Plantarium; Phytoimages; CalPhotos; Schede di Botanica

Cuscuta capitata Roxb.

Cuscuta carnosa Costea & Stefanovic

Cuscuta cassytoides Nees ex Engelm.

Cuscuta castroviejoi M.A. Garcia

Cuscuta cephalanthi Engelm.: Parasitic Plant Connection; IPM images

Cuscuta chapalana Yunck.: Phytoimages

Cuscuta chilensis Ker Gawl.: Phytoimages; Parasitic Plant Connection; ChileFlora

Cuscuta chinensis Lam.: Flora of China; Botany Photo of the Day, UBC

Cuscuta choisiana Yunck.

Cuscuta cockerellii Yunck.

Cuscuta compacta Juss.: Parasitic Plant Connection

Cuscuta corniculata Engelm.

Cuscuta coryli Engelm. PBASE (J. McNeal)

Cuscuta corymbosa Ruiz & Pavon.: Phytoimages

Cuscuta costaricensis Yunck.; Phytoimages

Cuscuta cotijana Costea & I. Garcia; Phytoimages

Cuscuta cozumeliensis Yunck.

Cuscuta cristata Engelm.

Cuscuta cucullata Yunck.

Cuscuta cuspidata Engelm.: Parasitic Plant Connection

Cuscuta decipiens Yunck.

Cuscuta deltoidea Yunck.

Cuscuta dentatasquamata Yunck.

Cuscuta denticulata Engelm.: CalPhotos

Cuscuta desmouliniana Yunck. Phytoimages

Cuscuta draconella Costea & Stefanovic

Cuscuta epilinum Weihe: Parasitic Plant Connection; Schede di Botanica

Cuscuta epithymum (L.) L.: Parasitic Plant Connection; Schede di Botanica

Cuscuta erosa Yunck.: Phytoimages

Cuscuta europaea L.: Parasitic Plant Connection; PBASE; Plantarium; Schede di Botanica

Cuscuta exaltata Engelm.: Parasitic Plant Connection; PBASE (J. McNeal) 

Cuscuta floribunda Kunth

Cuscuta flossdorfii Hicken

Cuscuta foetida Kunth: Galeria de fotos de Shismai (Peru); Flickr (Nancy.Rolando)

Cuscuta friesii Yunck.

Cuscuta gerrardii Baker

Cuscuta gigantea Griff.

Cuscuta glabrior (Engelm.) Yunck.: TAMU herbarium; Flickr (S. Hill)

Cuscuta globiflora Engelm.

Cuscuta globosa Ridley

Cuscuta globulosa Benth.

Cuscuta glomerata Choisy: Parasitic Plant Connection; PBASE (J. McNeal); Flickr (various authors). 

Cuscuta goyaziana Yunck.

Cuscuta gracillima Engelm.: Phytoimages

Cuscuta grandiflora Kunth: Phytoimages; Parasitic Plant Connection; FossilFlowers.org ; WLU (photos by Jim Farfán: photo 1; photo 2; photo 3)

Cuscuta gronovii Willd. ex Schult.: Phytoimages; Parasitic Plant Connection

Cuscuta gymnocarpa Engelm.

Cuscuta harperi Small: PBASE: photo 1 and 2 (Joel McNeal); Flickr (Melody McClure)

Cuscuta haughtii Yunck.

Cuscuta haussknechtii Yunck.

Cuscuta hitchcockii Yunck.

Cuscuta howelliana Rubtzoff: Calphotos

Cuscuta hyalina Roth

Cuscuta incurvata Progel

Cuscuta indecora Choisy: Phytoimages; Parasitic Plant Connection; Arizona Wild Flowers; SEINet

Cuscuta insquamata Yunck.

Cuscuta jalapensis Schltdl. Picasa (Art Vogel); Phytoimages

Cuscuta japonica Choisy: Plantarium; Parasitic Plant Connection

Cuscuta jepsonii Yunck.

Cuscuta kilimanjari Oliv. 

Cuscuta kurdica Engelm.

Cuscuta lacerata Yunck.

Cuscuta legitima Costea & Stefanovic: Phytoimages; 

Cuscuta lehmanniana Bunge: Plantarium

Cuscuta leptantha Engelm.: CalPhotos

Cuscuta letourneuxii Trabut

Cuscuta liliputana Costea & Stefanovic

Cuscuta lindsayi Wiggins: Phytoimages

Cuscuta lucidacarpa Yunck.

Cuscuta lupuliformis Krock.: Parasitic Plant Connection; Plantarium; PBASE

Cuscuta macrocephala W. Schaffn. ex Yunck.

Cuscuta macvaughii Yunck.

Cuscuta membranacea Yunck.

Cuscuta mexicana Yunck.

Cuscuta micrantha Choisy

Cuscuta microstyla Engelm.: Phytoimages

Cuscuta mitriformis Engelm. FossilFlowers.org ; Picasa (Ron Parsons)

Cuscuta monogyna Vahl: Parasitic Plant Connection; Plantarium

Cuscuta natalensis Baker

Cuscuta nevadensis I. M. Johnst.

Cuscuta nitida E. Mey. ex Choisy

Cuscuta nivea M.A.Garcia: Parasitic Plant Connection

Cuscuta obtusata Trab. 

Cuscuta obtusiflora Kunth: Phytoimages

Cuscuta occidentalis Millsp.: CalPhotos

Cuscuta odontolepis Engelm.;

Cuscuta odorata Ruiz & Pav.: Marjin van den Brink's photos

Cuscuta orbiculata Yunck.

Cuscuta ortegana Yunck.: Phytoimages

Cuscuta pacifica Costea & M.A.R Wright: CalPhotos; Parasitic Plant Connection; Phytoimages

Cuscuta paitana Yunck.

Cuscuta palaestina Boiss.: Parasitic Plant Connection

Cuscuta palustris Yunck.

Cuscuta parodiniana Yunck.

Cuscuta partita Choisy

Cuscuta parviflora Engelm.

Cuscuta pauciflora Phil.: WLU: photos 1; photo 2; photo 3

Cuscuta pedicellata Ledeb.: Parasitic Plant Connection

Cuscuta pentagona Engelm.;

Cuscuta peruviana Yunck.

Cuscuta planiflora Ten.: FloradeCanarias.org; Plantarium

Cuscuta plattensis A Nelson

Cuscuta platyloba Progel

Cuscuta polyanthemos W. Schaffn. ex Yunck.

Cuscuta polygonoides Engelm.

Cuscuta potosina W. Schaffn. ex S. Watson

Cuscuta prismatica Pav. ex Choisy

Cuscuta pulchella Engelm.

Cuscuta punana Costea & Stefanovic

Cuscuta purpurata Phil.: Flickr (Jardin Botanico Nacional de Viña); Flickr: photo 1; photo 2 (Andrea Ugarte); WLU; Phytoimages; 

Cuscuta purpusii Yunck.

Cuscuta pusilla Phil. ex Yunck.

Cuscuta racemosa Mart.: FloraSBS

Cuscuta rausii M.A. Garcia: Parasitic Plant Connection

Cuscuta reflexa Roxb.: Parasitic Plant Connection; Calphotos; Convolvulaceae unlimited; Flickr (T. Rodd)

Cuscuta rojasii Hunziker

Cuscuta rostrata Shuttlew. ex Engelm. & A. Gray: Parasitic Plant Connection; PBASE (J. McNeal)

Cuscuta rotundiflora Hunziker

Cuscuta rubella Yunck.

Cuscuta rugosiceps Yunck.

Cuscuta runyonii Yunck.: wildflower.org

Cuscuta salina Engelm.: CalPhotos

Cuscuta sandwichiana Choisy: Parasitic Plant Connection; Flickr (J. Nielsen); Morphbank;

Cuscuta schlechteri Yunck.

Cuscuta serrata Yunck.

Cuscuta squamata Engelm.: Parasitic Plant Connection

Cuscuta sidarum Liemb.

Cuscuta somaliensis Yunck.: Parasitic Plant Connection

Cuscuta sphaerogyna Engelm.

Cuscuta stenolepis Engelm.

Cuscuta stenoloba Bornmuller & Scwarz

Cuscuta strobilacea Liebm. Phytoimages

Cuscuta stuckertii Yunck.

Cuscuta subinclusa Durand & Hilgard: CalPhotos

Cuscuta suaveolens Ser.

Cuscuta suksdorfii Yunck.: CalPhotos

Cuscuta tasmanica Engelm.: Parasitic Plant Connection; Flickr (davidtng); Flickr (Nuytsia@Tas)

Cuscuta tatei Yunck.

Cuscuta timorensis Decaisne

Cuscuta tinctoria Mart. ex Engelm.: Phytoimages

Cuscuta tinei Insenga

Cuscuta trichostyla Engelm.

Cuscuta triumvirati Lange: Parasitic Plant Connection ; Picasa

Cuscuta tuberculata Brandegee

Cuscuta tucumana Yunck.

Cuscuta umbellata Kunth; SEINet

Cuscuta umbrosa Beyr. ex Hook 

Cuscuta vandevenderi Costea & Stefanovic

Cuscuta veatchii Brandegee

Cuscuta victoriana Yunck. FloraBase

Cuscuta warneri Yunck.

Cuscuta werdermannii Hunziker

Cuscuta woodsonii Yunck. Flickr: several photos (doseybat)

Cuscuta xanthochortos Mart.

Cuscuta yucatana Yunck.

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