Crataegus

Japanese: Crataegus

...A deciduous shrub of the Rosaceae family native to China and cultivated as a garden tree. It grows to a height of 1-1.5m, with many branches, and new branches are hairy and thorny. The leaves are broadly obovate to elliptical-oblong ovate, often shallowly to deeply divided into three lobes at the top, and have blunt serrations on the leaf margins. As new leaves unfold in spring, several flowers appear in a corymb at the end of the branches. The flowers have five petals, are white, and are about 2cm in diameter. The fruits that ripen in autumn are spherical, about 1.5cm in diameter, and usually turn red. They are called sanza (mountain quince) and are used medicinally as diuretics and for menstrual circulation. ...

From [Pyracantha]

…There are several species of the Pyracantha genus found in southeastern Europe and Asia. They are closely related to the Cotoneaster and Crataegus genuses, and are distinguished by their thorns and the characteristics of their fruit. They are often used for cut flowers and hedges, as their fruits are as beautiful as their flowers. …

*Some of the terminology explanations that mention "Crataegus" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…中国原産で，庭木として栽植されるバラ科の落葉低木。高さは1～1.5mで，多くの枝を出し，新枝は有毛でとげがある。葉は広倒卵形から楕円状長卵形で，上部で浅～深3裂することが多く，葉縁には鈍鋸歯がある。春に新葉が展開するとともに，枝の先に散房状に数花をつける。花は5弁，白色で，直径は約2cmである。秋に熟す果実は球形で，直径約1.5cm，通常紅熟し，山楂（さんざ）と呼ばれ，薬用とされて利尿，通経に効きめがあるとされる。…