According to observations of naturalists and beekeepers.
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Pear trees are native to southern, central and western Europe and grow best in light, deep soils in a mild climate.
The common pear is probably of European origin and has been cultivated since ancient times. The pear was introduced into the New World by Europeans as soon as the colonies were established. Early Spanish missionaries carried the fruit to Mexico and California. In most pear-growing countries of the world outside Asia, by far the most widely grown pear variety is Williams’ Bon Chrétien, known in the United States as Bartlett.
This plant is present in at least 43 states/provinces in this country.
The common pear tree is broad-headed and up to 13 meters (43 feet) high at maturity. The trees are relatively long-lived (50 to 75 years) and may reach considerable size unless carefully trained and pruned. The roundish to oval leathery leaves, somewhat wedge-shaped at their bases, appear about the same time as the flowers, which are about 2.5 cm (1 inch) wide and usually white. Pear flowers are usually white or pink and have five petals and sepals; the bases of the five styles are separated. Pear fruits are generally sweeter and of a softer texture than apples and are distinguished by the presence of hard cells in the flesh, the so-called grit, or stone cells. In general, pear fruits are elongate, being narrow at the stem end and broader at the opposite end. Pears are usually propagated by budding or grafting onto a rootstock, usually of Pyrus communis origin.
The pear blooming before the leaf shoots. Main bloom time: Early spring, Late spring, Mid spring.
Celtis laevigata (aka: Hackberry, Sugarberry, Lowland hackberry, Sugar hackberry, Arizona sugarberry, Netleaf hackberry, Small's hackberry, Southern hackberry, Texas sugarberry)
Acer negundo (aka: Boxelder, Western boxelder, Arizona boxelder, California boxelder, Texas boxelder, Interior boxelder, Violet boxelder)
Pyrus communis (aka: European pear, Common pear)
Rubus spectabilis (aka: Salmonberry)
Acer glabrum (aka: Rocky Mountain maple, Douglas maple, Greene's maple, New Mexico maple, Torrey maple)
Salix lucida (aka: Shining willow, Greenleaf willow, Tail-leaf willow, Whiplash willow, Pacific willow, Lance-leaf willow, Longleaf willow, Red willow, Western shining willow)
Salix exigua (aka: Narrowleaf willow, Coyote willow)
Acer grandidentatum (aka: Bigtooth maple, Canyon maple, Western sugar maple)
Crataegus douglasii (aka: Black hawthorn, Douglas hawthorn, River hawthorn, Western thornapple)
Salix scouleriana (aka: Scouler's willow, Upland willow)
Salix bebbiana (aka: Bebb willow, Beak willow, Beaked willow, Long-beaked willow, Diamond willow, Chaton, Petit Minou, Smooth Bebb willow)
Acer platanoides (aka: Norway maple)
Rubus ursinus (aka: California blackberry, California dewberry, California grapeleaf dewberry, Douglasberry, Pacific blackberry)
Prunus emarginata (aka: Bitter cherry)
Salix drummondiana (aka: Drummond's willow, Beautiful willow, Blue willow)
Salix amygdaloides (aka: Peachleaf willow, Peach leaf willow)
Salix boothii (aka: Booth's willow)
Salix lemmonii (aka: Lemmon's willow, Lemmon willow)
Salix planifolia (aka: Diamondleaf willow, Planeleaf willow)
Robinia pseudoacacia (aka: Black locust, False acacia, Yellow locust, White locust, Green locust, Post locust, Falsa acacia, Robinia)
Populus tremuloides (aka: Quaking aspen, Trembling aspen, Aspen, American aspen, Mountain aspen, Golden aspen, Trembling poplar, White poplar, Popple, Alamo Blanco)
Astragalus (aka: Milkvetch, Locoweed, Goat's-thorn)
Rubus laciniatus (aka: Cutleaf blackberry, Evergreen blackberry, Slashed blackberry)
Rhamnus cathartica (aka: Common buckthorn, European buckthorn, Dahurian buckthorn)
Rhus glabra (aka: Smooth sumac, Common sumac, Rocky Mountain sumac, Red sumac, Western sumac, White sumac)
Salix geyeriana (aka: Geyer willow, Silver willow)
Salix lutea (aka: Yellow willow)
Allium schoenoprasum (aka: Chives)
Brassica napus (aka: Rapeseed)
Sinapis arvensis (aka: Charlock mustard, California rape, Charlock, Corn mustard, Canola, Kaber mustard, Rapeseed mustard)
Gleditsia triacanthos (aka: Honey locust, Honey shucks locust, Common honeylocust, Sweet bean locust)
Cirsium arvense (aka: Creeping Thistle, Canada thistle, Field thistle, California thistle, Lettuce from hell thistle, Corn thistle, Cursed thistle, Green thistle, Hard thistle, Perennial thistle, Prickly thistle, Small-flowered thistle, Way thistle, Stinger-needles)
Prunus virginiana (aka: Chokecherry, Western chokecherry, Common chokecherry, Black chokecherry)