Neurogenic shock: A type of shock (a life-threatening medical condition in which there is insufficient blood flow throughout the body) that is caused by the sudden loss of signals from the sympathetic nervous system that maintain the normal muscle tone in blood vessel walls.
Smooth bromegrass forms rhizomes (underground stems that run parallel to the soil just below the soil surface) and thus spreads and forms a denser turf than many of the other grasses. The best identifying characteristic of this species is the W that is found imprinted at about the center of the leaf blade.
Two species of crabgrass, hairy and smooth, are commonly found in Pennsylvania (smooth crabgrass predominates in turfgrass stands). Both species are summer annuals and have wide (Â¼- to Â½-inch), sparsely hairy, pale-green leaves that taper to a sharp point. Leaves of hairy crabgrass are hairier than smooth crabgrass. The ligules of both species are long and membranous. Crabgrass does not have auricles. Seedheads are divided spikes that project like fingers from the stem, producing thousands of seeds in late summer.