The Juncus triformis Complex. Mem (39)

The Juncus triformis complex is a small group of highly reduced annual rushes found in vernally moist areas of western North America, centered in California. Although the complex was revised as recently as 1948, this volume treats two aspects that have warranted further investigation: the exact circumscription of taxa within the complex; and the origina and placement of the complex within the genus. The present re-evaluation of the Juncus triformis compelx is based primarily on a morphological examination of a wide selection of herbarium specimens, four summers of field work, scanning electron microscopy of seed coat patterns, chromosomal studies, and observations of cultivated specimens. Includes keys, descriptions, and black and white illustrations.