| Abstract Detail
Systematics Section / ASPT Barnes, Donna M. [1], Johnson, Leigh A. [1]. Reappraised pollen morphology and sectional classification in Navarretia (Polemoniaceae). Pollen morphology of all species and sub-species of Navarretia (Polemoniaceae) was examined by scanning electron microscopy. Seven distinct pollen types with 1-5 sub-types were observed. Type determinations were based primarily on surface sculpturing: Type I - semitectate, heterobrochate, reticulate; Type II - semitectate, reticulate, heterobrochate, echinate, with flattened, cross etched muri; Type III - semitectate, finely striate; type IV - semitectate, striate-reticulate; Type V - semitectate, microreticulate, heterobrochate, microechinate; Type VI - semitectate, rugulose; Type VII - tectate, perforate, microechinate. Evaluation of pollen morphology revealed discrepancies with regard to previously described Navarretia pollen grains, and in respect to accepted sectional classifications. Discrepancies in pollen morphology include the following: 1) Stuchlik's (1967) description of N. leucocephala, N. minima (N. leucocephala subsp. minima) and N. prostrata as having a retipilate sexine and N. prolifera as having a reticulate sexine with uniform lumina; 2) Taylor and Levine's (1975) description of N. plieantha (N. leucocephala subsp. plieantha) as having a foveolate sexine, N. atractyloides as having a striato-reticulate sexine and N. prolifera subsp. lutea as having a finely reticulate sexine with elongate lumina; and 3) Grant and Day's (1998) description of Gilia capillaris (N. capillaris) and G. leptalea subsp. bicolor (N. leptalea subsp. bicolor) as having a striate sexine and G. sinistra subsp. sinstra (N. sinistra) as having a pertectate sexine. Sectional discrepancies are as follows: Type I includes taxa from sections Masonia, Mitracarpium, and Navarretia. Type II generally corresponds with section Navarretia. Types III and IV include taxa from sections Masonia and Ageochloa. Types V and VI include taxa from section Ageochloa. Type VII includes taxa new to Navarretia, in which the section has not yet been specified. Log in to add this item to your schedule
1 - Brigham Young University, Department of Integrative Biology, P.O. Box 5181, Provo, Utah, 84602, USA
Keywords: Navarretia pollen morphology Navarretia sectional classification.
Presentation Type: Oral Paper Session: 20-4 Location: 408/Hilton Date: Monday, August 15th, 2005 Time: 4:15 PM Abstract ID:367 |