Systematics Section / ASPT
Berger, Brent , Elisens, Wayne .
A Reevaluation of the Lindernia dubia Species Complex.
Lindernia All. is one of 13 genera in the Linderniaceae and is represented by ~100 morphologically diverse species. This genus is widely distributed throughout the world and is particularly diverse in Africa and Southeast Asia. Recent morphological treatments (Lewis and Fischer) recognize nine North American species, with one, L. dubia, having four varieties: L. dubia var. dubia, L. dubia var. anagallidea, L. dubia var. mexicana, and L. dubia var. rhizomatosa. The objective of this study was to reexamine the proposed L. dubia species complex of Lewis based on seed, pedicel and leaf characteristics. To reevaluate the current circumscription of L. dubia, 2297 geographically diverse specimens were examined and measured for pedicel length, subtending leaf length, subtending leaf width, and corolla tube length. The position of the largest leaves was recorded, and scanning electron microscopy (SEM) was used to evaluate the seed surface sculpturing. Although SEM revealed unique differences among the proposed varieties, character analyses of the aforementioned measurements reveal a broad range of morphological variation within the species complex and, consequently, do not support Lewis' infraspecific treatment of L. dubia.
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1 - University of Oklahoma, Botany and Microbiology, 770 Van Vleet Oval Rm 204, Norman, Oklahoma, 73019, USA
2 - University of Oklahoma, Botany & Microbiology and Oklahoma Biological Survey, 770 Van Vleet Oval, Norman, Oklahoma, 73019, USA
Presentation Type: Oral Paper
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 4:30 PM