Comm #8250
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Sedum pulchellum - Allium drummondii - Phemeranthus parviflorus - Centaurium texense / Nostoc commune Forbland
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accession code: urn:lsid:vegbank.org:commConcept:33645-{B8F4B899-27AB-418A-A750-67286B851508}
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NatureServe Biotics 2019 |
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This association accommodates seasonally wet limestone glades of the blackland prairie region of Texas. These glades are typically on the upper rims of gradual to moderately steep slopes, in areas exceeding 1 ha, and inter-dispersed among tallgrass prairie dominated by <i>Schizachyrium scoparium, Sorghastrum nutans</i>, and <i>Carex microdonta</i>. The lower slopes of the prairie typically grades into a woodland dominated by <i>Quercus muehlenbergii, Quercus velutina, Ulmus rubra, Juniperus virginiana, Juniperus ashei, Fraxinus americana, Cercis canadensis, Rhamnus lanceolata, Cornus drummondii, Rhus aromatica</i>, and <i>Styphnolobium affine</i>. Ground and limestone pool moisture during late winter is prevalent. This glade vegetation has developed on the Gober Chalk, Pawpaw, and Lavender Outcrop formations and characteristically occupies depressions in the limestone which hold water in the winter and early spring. These areas become desiccated and baked in the heat of summer. Characteristic plants are the annuals <i>Sedum pulchellum</i> and <i>Centaurium texense</i>, and the perennials <i>Allium drummondii</i> and <i>Phemeranthus parviflorus</i>. The blue-green alga <i>Nostoc commune</i> forms mats. Other wet pool specialists include <i>Crassula drummondii, Rotala ramosior</i>, and <i>Valerianella amarella</i>. Characteristic taxa that occupy the pools when they dry out include <i>Sporobolus vaginiflorus var. ozarkanus, Sporobolus vaginiflorus var. vaginiflorus, Minuartia patula, Houstonia micrantha, Portulaca</i> sp., <i>Galium virgatum, Croton monanthogynus</i>, and <i>Chamaesyce nutans</i>. Other taxa that are commonly found in crevices of limestone sheets and drier edges include <i>Bouteloua curtipendula, Bouteloua rigidiseta, Paronychia virginica, Lesquerella gracilis, Tetraneuris linearifolia, Asclepias asperula, Heliotropium tenellum, Stenaria nigricans, Hedeoma reverchonii, Draba cuneifolia, Anemone berlandieri, Opuntia</i> sp., <i>Lithospermum incisum, Thelesperma filifolium, Zigadenus nuttallii, Orobanche</i> sp., <i>Penstemon cobaea, Spiranthes magnicamporum</i>, and <i>Evax verna</i>. |
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