There is little to no Perennial Rye Grass in this picture or anywhere else in the ‘bowl’. Poa annua dominates and has for some time. The soil seed bank is filled with it. The stressful conditions work against the Rye and favor this Poa. A similar situation exists throughout much of this Park. Use and cultural practice favors Poa. Poa annua thrives under short frequent irrigation practice, which is the rule here under much of the summer because overseeding occurs after major events to revitalize over stressed Rye grass turf. The germinating Rye needs frequent irrigation which favors the Poa. The short statured Poa annua reaches flowering height quickly producing seed well before and ‘below’ whatever Lolium perenne is around.