Abstract
The genus Ceropegia L. of Family Apocynaceae, subfamily Asclepiadoideae comprises 213 accepted taxa distributed in tropical and sub-tropical regions of Africa, India, Australia and neighbouring regions. The taxa are mainly identified on the basis of flower morphology. A study was undertaken to reveal micromorphology of 26 taxa distributed in Western Ghats of India to solve the identity problems. The micromorphology is studied with standard microscopic methods in five replicates of each character and taxa to reveal the parameters, distribution of stomata, stomatal index, stomatal density, epidermal cell wall pattern and stomatal measurements. The data obtained was subjected to ANOVA to find out the experimental mean, standard deviation and standard error. A consensus phylogeny tree is constructed using the PAST on the basis of Jaccard similarity coefficient. Results of study revealed that, micro morphological characters, viz., type of stomata, number and characters of subsidiaries, anticlinal cell wall pattern, and stomatal index are very significant in delimitation of closely allied taxa. Beside ‘paracytic’ stomata, ‘tetracytic’, ‘isotricytic’, & ‘anomocytic’ stomatal types, and amphistomatic distribution are recorded for first time in Ceropegia. The taxa are separated easily from each other using vegetative micromorphology and can be identified even in absence of flowers. An identification key and phylogenetic tree is derived on the basis of vegetative micro-morphology and gross morphological characters.
Highlights
J TTRahagdale & Rahangdale basis of vegetative and micro-morphological characters.The genus Ceropegia L. of family Apocynaceae, subfamily Asclepiadoideae comprises many narrow endemic and threatened species distributed only in tropical and sub-tropical regions especially, Africa, India, Australia, and neighbouring region
The observations regarding stomatal distribution, type, subsidiaries character & number, and the anticlinal wall characters of epidermal cells are presented in the Table 2 and Image 1
C. bulbosa var. bulbosa and C. bulbosa var. lushii, the leaves are amphistomatic, i.e., stomata are present on both surfaces of the leaves
Summary
J TTRahagdale & Rahangdale basis of vegetative and micro-morphological characters.The genus Ceropegia L. of family Apocynaceae, subfamily Asclepiadoideae comprises many narrow endemic and threatened species distributed only in tropical and sub-tropical regions especially, Africa, India, Australia, and neighbouring region. In India, it is represented by about 68 taxa comprising of 61 species, two subspecies and five varieties with recent descriptions by Diwakar & Singh (2011), Rahangdale & Rahangdale (2012), Kamble et al (2012), Sujanapal et al (2013), and Kumar et al (2018). Of these taxa, 40 species and six varieties are endemic to India, while 34 species and two varieties are endemic to Western Ghats (Jagtap & Singh 1999; Singh et al 2015)
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