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# Distribution and Production of Justicia americana in the New River, Virginia

Brian H. Hill
Castanea
Vol. 46, No. 2 (Jun., 1981), pp. 162-169
Published by: Allen Press on behalf of the Southern Appalachian Botanical Society
Stable URL: http://www.jstor.org/stable/4033049
Page Count: 8
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## Abstract

Aerial photography indicated that Justicia americana is confined to the hardwater section of the New River. This species was determined to be moderately calciphilous based on average conductivity and hardness ratio of the water it inhabited. Productivity and standing crop averaged 23.3 g ash free dry weight (AFDW) $\text{m}^{-2}\text{d}^{-1}$ and 2524 g AFDW m-2, respectively. Productivity of J. americana was 4-5 times greater than other major aquatic species in the New River and, in spite of its limited distribution, contributed 12% of the total aquatic macrophyte organic matter input to the river.

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