ancient astringent cydonia oblonga deciduous fertility food fragrant fruit golden apples hard hardy historic knobbly love lumpy ornamental persian pome fruit quince quinces rosaceae family sour sweet when cooked symbolic yellow alligator-pear avocado avocado-pear butter-pear climacteric-fruit cultivar cut fertility-fruit firm flesh Fuerte-variety green guacamole healthy large-berry large-seed nutritious ovate pear-shaped perennials persea-americana ripe section smooth soft tree wrinkled alligator pear avocado pear black butter pear climacteric fruit egg-shaped fertility fruit Hass variety large berry large seed pebbled skin persea americana rough pebbled-skin kernel seed