Pluots, apriums, apriplums, or plumcots, are some of the hybrids between different Prunus species that are also called interspecific (or IS) plums. In the United States and Canada, these fruits are known by most regulatory agencies as interspecific plums. Whereas plumcots and apriplums are first-generation hybrids between a plum parent (P. salicina or P. cerasifera or their hybrids), and an apricot (P. armeniaca), pluots and apriums are later-generations. Both names "plumcot" and "apriplum" have been used for trees derived from a plum seed parent, and are therefore equivalent. 
Natural plumcots/apriplums have been known for hundreds of years from regions of the world that grow both plums and apricots from seed. The name plumcot was created by Luther Burbank. Plumcot tree was asexually reproduced by budding whereas apriplum tree was a result from pollination and it is self-unfruitful.
Pluots /ˈpluːɒt/ are later-generations that show more plum than apricot characteristics; the fruit's exterior has smooth skin closely resembling that of a plum. Pluots were developed in the late 20th century by Floyd Zaiger, and "Pluot" is a registered trademark of Zaiger's Genetics. The Pluot was featured on an Andy Rooney segment on 60 Minutes.
Apriums are complex plum-apricot hybrids that show more apricot traits and flavor, genetically they are one-fourth (25%) plum and three-fourths (75%) apricot. Aprium varieties were developed in the late 1980s by Floyd Zaiger, and "Aprium" is a registered trademark of Zaiger's Genetics.
Apriums resemble apricots on the outside. The flesh is usually dense. Apriums are noted for their sweet taste, due to their high content of fructose and other complex sugars. Apriums are usually only available early in the fruit season, like apricots and unlike pluots, which include some very late-ripening varieties.
Aprium trees grow quickly and are smaller compared to other common home-grown apricots. The fruit is gold, with red coloration. Semi-mature fruit is hard and does not ripen if picked before completely mature.
Plumcot varieties include:
Flavorosa: very sweet, medium-sized, flat round dark-purple fruit with red flesh, early ripening
Flavor Royal: very sweet, medium-sized, dark purple with crimson flesh, early ripening
Eagle Egg: very sweet, medium-sized, dark red with crimson flesh, early mid season
Amigo: rosy plum flavors with a hint of berry, red skin with red bleeding to yellow flesh, early mid season
Tropical Plumana: sugary tropical punch flavor, medium-sized, red over greenish yellow background with yellow flesh, early mid season
Crimson Sweet: sweet flavor, medium-sized, crimson skin with pinkish flesh, mid season
Dapple Jack: medium size with mottled pale green, red-spotted skin, red juicy flesh, late mid season
Sweet Treat: super sweet with hints of Thompson grape flavor, green, golden skin with yellow juicy flesh, late mid season
Flavor Queen: medium to large size, very juicy flesh, very sweet, golden yellow when fully ripe, late season
Dapple Dandy: large size with mottled pale green, red-spotted skin, red or pink juicy flesh, late season, firm fleshed and easily shipped
Flavor Grenade: large size, oblong shape with red blush on green background, crisp, refreshing pineapple and juicy apple flavor, late season
Summer Punch: medium to large size, very juicy flesh, very sweet with berry and melon undertones, late season
Tropical Sunrise: Yellow to orange color skin with red blush and orange flesh, sweet plum and apricot flavors
Flavor King: fruit punch flavor, medium size, with burgundy skin and red, super sweet, juicy flesh, late season
King Kong: very large size with black skin, plum-like flavor with hints of almond
Flavor Fall: large size, average flavor, red skin with yellow flesh, very late season
^Okie, W.R. 2005. Spring satin plumcot. Journal of American Pomological Society. 59(3):119-124.abstract
^J. Whitson; R. John; H.S. Williams, ed. (1914). "Chapter 7: How far can plant improvement go? The crossroads — where fact and theory seem to part". Luther Burbank: his methods and discoveries and their practical application1. Luther Burbank Press. pp. 211–244.
^"Pluot". Oxford English Dictionary Online (subscription required). Draft entry, September 2006. Retrieved 2009-07-03.Check date values in: |date= (help)