TABLE OF CONTENTS 



Introduction 7 



Acknowledgments 8 



History 8 



Material and Methods 10 



Morphology 12 



Systematic .\rrangement of the Genus 20 



Sub-genus Monogyna 20 



Cuscuta exaltata Engelmann 21 



Sub-genus Succuta 21 



Cuscuta epithymum Murray 22 



Cuscuta planiflora Tenore 22 



Cuscuta europaea Linnaeus 23 



Cuscuta epilinum Weihe 24 



Sub-genus Grammica 25 



Cuscuta erosa n. sp 26 



Cuscuta mitraeformis Engelmann 26 



Cuscuta jalapensis Schlechtendal 27 



Cuscuta rugosiceps n. sp 27 



Cuscuta ceratophora n. sp 28 



Ctisctita chapalana n. sp 28 



Cuscuta pringlei n. sp 29 



Cuscuta applanata Engelmaim 30 



Cuscuta tinctoria Martius 31 



Cuscuta floribiinda Humboldt, Bonpland & Kunth 32 



Cuscuta amcricana Linnaeus 32 



Cuscuta corymbosa Ruiz & Pavon 34 



Cuscuta macrocephala Schaffner, n. sp 36 



Cuscuta purpusii n. sp 37 



Cuscuta choisiana n. sp 38 



Cuscuta odontolepis Engelmann 38 



Cuscuta potosina Schaffner 39 



Cuscuta partita Choisy 40 



Cuscuta desmoiiliniana n. sp 40 



Cuscuta umbellata Humboldt, Bonpland & Kunth 41 



Cuscuta gracillima Engelmann 43 



Cuscuta lacerata n. sp 44 



Cuscuta deltoidea n. sp 44 



Cuscuta tuberculata Brandegee 45 



Cuscuta leptantha Engelmann 45 



Cuscuta polyanthemos Schaffner, n. sp 46 



Cuscuta glandulosa (Engelmann) Small 48 



Cuscuta polygonorum Engelmann 49 



Cuscuta pentagona Engelmann 50 



Cuscuta plattensis Nelson 53 



Cuscuta cephalanthi Engelmann 53 



Cuscuta racemosa chiliana Engelmann 54 



Cuscuta decipiens n. sp 55 



Cuscuta coryli Engelmann 55 



Cuscuta indecora Choisy 57 



