Comparative Morphology and Surface Microsculpture of Cypsela in Some Taxa of the Asteraceae and Their Taxonomic Significance | ||
| Egyptian Journal of Botany | ||
| Article 4, Volume 56, Issue 2, February 2016, Pages 409-422 PDF (963.75 K) | ||
| DOI: 10.21608/ejbo.2017.1133 | ||
| Authors | ||
| H. A. Hussein* ; Marwa M. Eldemerdash | ||
| Department of Botany, Faculty of Science, Zagazig University, Zagazig | ||
| Abstract | ||
| MACRO- and micromorphological characteristics of cypsela in 13 species and one subspecies representing genera: Carthamus L., Centaurea L. Cichorium L., Cirsium Mill., Crepis L., Lactuca L., Picris L., Reichardia Roth, and Sonchus L.; belonging to the two tribes Cardueae and Cichorieae of the Asteraceae were examined under stereomicroscopy and scanning electron microscopy (SEM). The cypsela macromorphological features including; cypsela length measurements, colour, shape, surface texture and the number of ribs when present as well as the abscission scar characteristics and details of the surface, microsculpture peculiarities were investigated. The cypsela length and colour presented a minor taxonomic value. However, the other remaining features were proved to be primarily diagnostic at the species level and sometimes at the genus level but not distinctive for any of the two tribes. In addition, these features were very useful in the precise technical identification of the examined cypselae. An identification key for the studied taxa, based on the investigated aspects, was presented. | ||
| Keywords | ||
| Abscission scar; Asteraceae; Cypsela morphology; SEM; Surface microsculpture | ||
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