Abutilon indicum

Overview

Abutilon indicum is recorded in a Vietnamese saline forebeach community and at industrially salt-affected sites in Karachi. The Karachi study reports community-soil total soluble salts, not a plant-level NaCl experiment. [S1, S2, S3]

Names and classification

The accepted name is Abutilon indicum (L.) Sweet; synonyms in historical sources are interpreted within each source’s taxonomic concept. [S1, S2, S3, S4]

Available saline-site records come from a Vietnamese forebeach community and an industrially salt-affected site in Karachi; the industrial salt source and pollution context are relevant to the latter. [S1, S2, S4]

Morphology and identification

An erect, velvety-pubescent subshrub, with broad-ovate to nearly cordate leaves that have coarsely crenate-serrate margins and soft pubescence on both surfaces. Yellow flowers are solitary in the leaf axils. The dry schizocarp separates into several mericarps; the seeds are pubescent. [S1, S2, S6]

Distribution, habitat and phenology

A foredune halophytic community in south-central Vietnam is affected by seawater and salt-laden wind. In the Korangi–Landhi industrial zone of Karachi, naturally occurring A. indicum was a leading species in 10 of 28 plots at sites affected by industrial emissions and salinization. [S1, S2, S3, S4]

Available sources do not provide a consistent, reliable flowering or fruiting season; phenology is not extrapolated from a single locality or horticultural material. [S4]

Salinity in natural habitats

The Vietnamese list documents community association, while the Karachi survey documents spontaneous plants and community-soil salinity; neither measures a plant-specific root-zone threshold. [S1, S2, S3]

Salinity studies

Rehman and Iqbal recorded A. indicum as the leading species in 10 of 28 plots in Karachi’s Korangi–Landhi industrial zone. Table 2 gives a mean total-soluble-salt content of 10.2% for those plots; Table 1 reports 7.5–14.0% across all communities naming A. indicum. The measure was total soluble salts in 0–30 cm topsoil using the Bower–Wilcox method, not ECe, and individual ions were not reported. The authors interpret the finding as survival in soils with considerable soluble salts, but it is a cross-sectional community association. Industrial salinization and pollution may both shape the vegetation, so the result does not establish an individual root-zone threshold or experimental growth rate. [S3]

Reported mechanisms and ecological adaptations

The field lists and observations at industrially salt-affected sites did not measure physiological mechanisms in this species. Occurrence at an industrial salt source is an ecological observation, not evidence of a known ion-regulation pathway. [S1, S2, S3]

Conclusions and evidence gaps

The two records support occurrence in locally salt-affected habitats. Karachi TSS is a surface-soil community measure, and the Vietnamese list gives no species-specific salinity; neither establishes a species-wide tolerance class. [S1, S2, S3]