Volume 52 – Issue 4 (Dec 1987)

Rare Species of Rhexia L.

ABSTRACT Three <em>Rhexia</em> species, <em>R. aristosa</em>, <em>R. parviflora</em> and <em>R. salicifolia</em>, are candidates for listing as endangered or threatened by the United States Fish and Wildlife Service. This current review of the rarity of <em>Rhexia</em> taxa was made through communication with botanists, literature review, and field and herbarium studies. <em>R. parviflora</em> is very rare while <em>R. salicifolia</em> and <em>R. aristosa</em> are restricted, yet more locally abundant.

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The Recent Fire History of Cumberland Island, Georgia

ABSTRACT Investigation of archival materials, interviews, and field survey for charcoal and fire scars indicates pine and oak scrub communities and fresh water wetlands on Cumberland Island National Seashore have burned multiple times since 1900. Fire rotations are 20 to 30 years and correlate to coastal drought cycles. Lightning is an important source of ignition indicating succession from scrub communities to forest may be inhibited by frequent natural fires.

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Seed Germination and Flowering Requirements of the Rare Plant Arenaria fontinalis (Caryophyllaceae)

ABSTRACT Arenaria fontinalis (Short & Peter) Shinners (Caryophyllaceae) is endemic to wet limestone cliffs and ledges in north-central Kentucky and north-central Tennessee. Seeds are dispersed from mid-May to early July and germinate in September and October. Plants overwinter as semi-rosettes and flower and set seeds the following spring; thus, they behave as winter annuals. Seeds are dormant at maturity in spring, afterripen during summer and are nondormant by autumn. Seeds afterripened when alternately wetted and dried in an unheated greenhouse and in an incubator at 30/15°C and when kept continuously wet in incubators at 15/6, 20/10 and 30/15°C. Seeds did not afterripen when stored dry at ambient laboratory conditions. The peak of germination for seeds sown on soil in the unheated greenhouse in the springs of 1981, 1982 and 1983 occurred the following autumn, when mean daily maximum and minimum temperatures were about 25 and 15°C, respectively. Germination of 1-3%

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