98 Phytologia (Aug 2004) 86(2) 



OBSERVATIONS ON PARNASSIA GRANDIFOLIA DC. 

 (SAXIFRAGACEAE) IN THE WEST GULF COASTAL PLAIN 



Michael H. MacRoberts and Barbara R. MacRoberts 



Bog Research 



Shreveport LA 71104 



and 



Herbarium, Museum of Life Sciences 



Louisiana State University in Shreveport 



Shreveport LA 71115 



Lynn Stacey Jackson 



U.S. DA. Forest Service 



Kisatchie National Forest 



Winn Ranger District 



Winnfield LA 71483 



ABSTRACT 



We surveyed for and monitored Parnassia grandifolia, a West Gulf 

 Coastal Plain rare and imperiled species with a disjunct distribution. 



KEY WORDS: Parnassia grandifolia, pitcher plant bog, Louisiana, 

 floristics. 



INTRODUCTION 



Parnassia grandifolia, a southeastern obligate wetland endemic, is 

 of interest because it is globally rare and a disjunct species raising the 

 biogeographical question as to whether extant populations are relicts from 

 a once continuous distribution or are recent long distance colonizers, or 

 recolonizers. 



