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THE VASCULAR FLORA OF THE NORTH CENTRAL TEXAS WALNUT FORMATION

Rebecca K. Swadek and Tony L. Burgess
Journal of the Botanical Research Institute of Texas
Vol. 6, No. 2 (23 NOVEMBER 2012), pp. 725-752
Stable URL: http://www.jstor.org/stable/41972462
Page Count: 28
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
THE VASCULAR FLORA OF THE NORTH CENTRAL TEXAS WALNUT FORMATION
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Abstract

Political boundaries frequently define local floras. This floristic project takes a geological approach inspired by Dalea reverchonii (Comanche Peak prairie clover), which is primarily endemic to glades of the Walnut Formation. The Cretaceous Walnut Formation (Comanchean) lies on the drier western edge of the Fort Worth Prairie in North Central Texas. Its shallow limestone soils, formed from alternating layers of hard limestone and clayey marl, support a variety of habitats. Glades of barren limestone typically appear on ridgetops, grassland savannas form on eroding hillslopes, and seeps support diverse hyperseasonal vegetation. Vouchers were collected from January 2010 to June 2012 resulting in 469 infraspecific taxa, 453 species in 286 genera and 79 families. The richest five plant families are Asteraceae (74 taxa), Poaceae (73), Fabaceae (34), Euphorbiaceae (18), and Cyperaceae (17). There are 61 introduced species. Results indicate floristic affinities to limestone cedar glades of the Southeastern United States, the Edwards Plateau of Central Texas, and calcareous Apacherian Savannas of Southwestern North America. Las fronteras políticas definen frecuentemente las floras locales. Este proyecto florístico toma una aproximación geológica inspirada en Dalea reverchonii (trébol de la paradera de Comanche Peak), que es primariamente endémico de los claros de la formación Walnut. La formación Cretácica Walnut (Comancheana) está en el borde oeste más seco de la pradera de Fort Worth en el Norte-Centro de Texas. Sus suelos calcáreos poco profundos, formados por capas alternas de calizas duras y margas arcillosas, soportan una variedad de habitats. Aparecen típicos claros de calizas estériles en las cumbres, sabanas herbáceas en las laderas erosionadas, y filtraciones soportan una vegetación hiperestacional diversa. Se colectaron testigos des enero de 2010 a junio de 2012 dando como resultado 469 taxa infraspecíficos, 453 especies in 286 géneros y 79 familias. Las cinco familias de plantas más ricas son Asteraceae (74 taxa), Poaceae (73), Fabaceae (34), Euphorbiaceae (18), y Cyperaceae (17). Hay 47 especies exóticas. Los resultados indican afinidades florísticas con las calizas de cedar glades del sureste de los Estados Unidos, el Edwards Plateau del centro de Texas, y sabanas calcáreas Apacherianas del suroeste de Norte América.

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