What are the morphological characteristics of the Millstone Jujube? A detailed explanation of its fruit features

The fruit of the Millstone Jujube is millstone-shaped, with a constriction ring running horizontally across the middle of its body, 2 to 3 millimeters deep and wide; the upper part above the constriction is slender and small, while the lower part is broader and thicker. The average fruit weight is 7 grams, with a maximum of 13.7 grams, and the sizes are uneven. It is purplish red and glossy. The flesh is white-green, coarse in texture, with little juice, a rather faint sweetness and a slight tartness; the soluble solids content is 30 to 33%, the edible rate is 93.5%, the drying rate is 50.5%, and the total sugar content of the dried jujube is 63.8%. Its quality as a fresh-eating fruit is below average, and the flavor of the dried jujube is poor. It ripens in mid-to-late September. The tree is tall and large, with relatively poor fruiting performance, but it has strong adaptability, is drought-tolerant and resistant to fruit cracking. Its fruit shape is unusual and attractive, making it suitable for ornamental purposes.