Abstract Detail



Systematics

Neff, Lois [1], Morin, Nancy [2].

Taxonomic implications of staminal filament appendages in Nemacladus (Campanulaceae).

Nemacladus (Nemacladoideae, Campanulaceae), is a genus of about 24 species of mostly desert annuals widely distributed in the southwestern United States and northern Mexico. The flowers of Nemacladus species have large nectaries and a character unique in the family: single-celled appendages that are attached to the filaments and, in some species, partially cover the nectaries. These shiny appendages may function to attract pollinators. The appendages differ in their types of attachments and shapes, and vary in the numbers and shapes of cells.  Nectaries differ in shapes, sizes, and textures. Neither character has been examined in a phylogenetic context. Both light microscopy and scanning electron microscopy were used to examine these characters, and comparisons with preliminary molecular trees were made. Appendage cell numbers and shapes are correlated with species membership in the northern or southern clade.


1 - Northern Arizona University, Biological Sciences, PO Box 5640, 617 S. Beaver, Flagstaff, Arizona, 86011, United States
2 - Flora Of North America, P. O. Box 716, Point Arena, CA, 95468, United States

Keywords:
Nemacladus
phylogeny
character
appendage.

Presentation Type: Oral Paper
Number:
Abstract ID:453
Candidate for Awards:Katherine Esau Award,Maynard F. Moseley Award


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