Nelumbo - The Bulletin of the Botanical Survey of India

R. R. Das ¹

Affiliations
1 Vikram University, School of Studies in Botany, Gwalior, M. P., IN

Abstract

The genus Evolvulus is represented by about 80 species in tropical regions of the world, the maximum number of species being recorded in Brazil. In India the genus is represented by two species, i.e. Evolvulus alsinoides Linn., and Evolvulus nummulariusLinn.

Evolvulus alsinoides Linn, is recorded to extend throughout India in open and grassy Jands, ascending to a height of 6000 ft. in the Himalayas. Evolvulus nummularius Linn, also grows throughout India in various habitats. However this species is not recorded in. any of the earlier floras of India. Raizada (1936) while describing it says "this is a recently introduced species or otherwise imperfectly known plant from the Upper Gangetic plain". The study presented here supports the view of its Recent introduction.

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R. Misra ¹, R. R. Das ²

Affiliations
1 Banaras Hindu University, Varanasi, IN
2 Vikram University, Ujjain, IN

Abstract

The physiological age of a plant or its parts is important for quantitative studies in Ecology. It is demonstrated by measurements of leaf size that the number of nodes from the apex in individuals is a good indicator of the physiological age among natural populations. Hence, it is suggested that for measurements of leaf and internode of individuals in a heterogenous population a definite size range for the uppermost or the first visible leaf or internode be fixed for counting downwards. The plastochron index be, however, used for other quantitative estimations in ecological studies.

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