Morning in the shade of a persimmon tree. Later, downstream below a hornbeam. A shy man hollers from across the valley.   Every other rhododendron flower holds a tiny bee, just the way each macaroni shell in pasta e fagioli eventually holds a bean.   A little Italian goes well up here. Latin, too&emdash;castanea, ruficapilla, caroliniana: Paroles: Dogwood calls the catbirds. Black cherry calls the blue.