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Page 3 #15 <br />PLANT COMP. <br />SYMBOL. COMMON NAME SCIENTIFIC NAME PERCENT <br /> <br />FORBS (cont.) <br />DAVI SILKY PRAIRIECLOVER DALEA VILLOSA T 1 <br />DAAU SILKTOP DALEA DALEA AUREA T 1 <br />PSTE3 SLIMFLOWER SCURFPEA PSORALEA TENUIFLORA T 1 <br />ABFR2 SNOWBALL SANDVERBENA ABRONIA FRAGRANS T 1 <br />TOEX2 STEMLESS TOWNSENDIA TOWNSENDIA EXSCAPA T 1 <br />CRTE4 TEXAS CROTON CROTON TEXENSIS T 1 <br />ALTE TEXTILE ONION ALLIUM TEXTILE T 1 <br />DACA7 WHITE PRAIRIECLOVER DALEA CANDIDA T 1 <br /> OTHER NATIVE FORBS T 3 <br />SHRUBS AND HALF-SHRUBS <br />PRPUB BESSEY-SANDCHERRY PRUNUS PUMILA BESSEYI 5 1 <br />0 <br />AMCA6 LEADPLANT AMORPHA AMORPHA CANESCENS 2 . <br />5 <br />ARFI2 SAND SAGEBRUSH ARTEMISIA FILIFOLIA 2 5 <br />OPPO PLAINS PRICKLYPEAR OPUNTIA POLYACANTHA T 1 <br />YUGL SMALL SOAPWEED YUCCA GLAUCA T 1 <br />EREF SPREADING ERIOGONUM ERIOGONUM EFFUSUM T 1 <br /> OHER NATIVE SHRUBS T 3 <br />1/ Names according to National List of Scientific Plant Names SCS-TP-159. <br />C. With overgrazing by cattle the native plants that will <br />immediately decrease are sand bluestem, prairie <br />sandreed, yellow Indiangrass, needleandthread, <br />switchgrass, little bluestem, sideoats grama, Bessey <br />sandcherry, and leadplant amorpha. Sand dropseed, blue <br />grama, sand sagebrush, yucca, blowout grass, lemon <br />scurfpea will be the principal increaser species. With <br />futher deterioration showy pigweed, annual buckwheat, <br />sand paspalum, sand verbena, red threeawn and annuals <br />along with the increaser species will dominate this site. <br />"Blowouts" can readily get started and can do additional <br />damage to the soil resource when this range site is <br />severely overgrazed. <br />d. 'Basal area (the area of ground surface covered by <br />perennial-vegetation at ground level) is approximately <br />15-20 percent. <br />e. If the range is in excellent condition, the approximate <br />total annual production (air-dry) ranges are: <br />Favorable Years 2500 lb/Ac <br />Normal Years 1800 lb/Ac <br />Unfavorable Years 1200 lb/Ac <br />Of this production, 5 to 10 percent will' likely be <br />unpalatable or out of reach of grazing animals.