Abstract Detail
Horsetails Through Form, Space, and Time Stevenson, Dennis WM [1]. The enigmatic morphology and anatomy of horsetails. The unusual combination of xeric and aquatic anatomy is well documented and easily understood in terms of structure and function responses to the extreme ecological situations these plants may experience within a growing season. The morphological features such as leaf arrangement and lateral bud position and origin are quite controversial. The so-called whorls of leaves are actually pseudowhorls and exhibit the same sets of contact parastichies and orthostichies as the lycophytes as well as the same asynchronous initiation. The branches arise in the axil of the leaf sheath between the leaves instead of in the leaf axil, which is typical for seed plants but rare for non-seed plants. The origin of lateral branches in Equisetum is either exogenous or endogenous with evidence for both modes. However, the presumably endogenous origin may well be the result of postgenital fusion of the leaf sheath base to the base of the internode. The role of the basal intercalary meristem the development of the lateral branches appears to be a factor in the interpretation of the origin of the lateral buds of the aerial axes.
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1 - THE NY BOTANICAL GARDEN, 2900 SOUTHERN BLVD, BRONX, NY, 10458-5126, USA
Keywords:
Equisetum
Branching
Phyllotaxis
Pseudowhorls.
Presentation Type: Symposium Presentation
Session: SY03, Horsetails through form, space and time
Location: Oglethrope Auditorium/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 1:45 PM
Number: SY03002
Abstract ID:400
Candidate for Awards:None | 
