PLATE – I. Stomatal variations in different species of Senecio Linnaeus: A. S. topkegolensis (abaxial surface); B. S. nudicaulis (abaxial surface); C. S. royleanus (abaxial surface); D. S. ramosus (abaxial surfacea); E. S. scandens (abaxial surface); F. S. raphanifolius (abaxial surface); G. S. albopurpureus (adaxial surface); H. S. ramosus (adaxial surface); I. S. kumaonensis (abaxial surface); J. S. laetus (abaxial surface); K. S. echaetus (adaxial surface); L. S. echaetus (abaxial surface). [Abbreviations used on photos: ano = anisocytic stomata; pol = polygonal epidermal cell; irr = irregular epidermal cell; rec = rectangular epidermal cell.]
Taxonomic significance of Micromorphology in Senecio Linnaeus (Senecioneae: Asteraceae)
by Joshi S. (Shrestha), Bajracharya D. M. (2015)
in Pleione 9(2): 401 – 408. 2015. – ISSN: 0973-9467
Abstract
Micromorphological characters like stomata and epidermal cell variations of twelve species of the genus Senecio Linnaeus of Asteraceae from Nepal Himalaya were carried out for solving the taxonomic problems within the genus.
Out of the 12 species studied, 6 species showed amphistomatic and 6 species showed hypostomatic leaf surface.
Four types of stomata were recorded in the genus; anomocytic, tricytic, anisocytic and tetracytic stomata.
The contiguous stomata were of common occurrence in all species.
The epidermal cells of leaf were found to be irregular to polygonal to rectangular. The stomata were elliptical and circular.
The distribution of stomata in the leaf surface and type of stomata and epidermal cell type were found to be taxonomically significant. It could be used as new parameter to delimit the species in the genus Senecio Linnaeus.
An artificial dichotomous key is presented to delimit the taxa of the genus Senecio L. from Nepal Himalaya.
PLANT STOMATA ENCYCLOPEDIA 