Generally, when hearing "Sakura", we are reminded of "Somei-Yoshino[ソメイヨシノ]".
Somei-yoshino is a kind of cherry tree. The cherry trees on the banks of the Potomak River at D.C. are also Somei-Yoshino.
But there are many kinds of Sakura in Japan and the most of them including Somei-Yoshino are cultivated species. They were made from about 10 original species such as Edo-higan[江戸彼岸（エドヒガン）], Ōshima-zakura[大島桜（オオシマザクラ）], Yama-zakura[山桜（ヤマザクラ）] and Mame-zakura[豆桜（マメザクラ）].
The famous Sakuras except for Somei-Yoshino are as follows.
Yama-zakura: That means cherry tree of mountain. Literally, These grows on the mountains. Yama-zakura is a representative wild Sakura species. This flower is white or pale pink. And its bark is used for Kaba-zaiku[樺細工（かばざいく）] which is a traditional craft of Kakunodate[角館（かくのだて）], Akita Pref.
Ōshima-zakura: Izu-Ōshima Island[伊豆大島（いずおおしま）] is a famous habit of them. That is the original species of many gardening Sakuras including Somei-Yoshino. That has big white blossoms. And salted leaves of that are used for an ingredient of Sakura-mochi[桜餅（さくらもち）](Mochi wrapped with salted Sakura leaf).
Kanhi-zakura[寒緋桜（カンヒザクラ）](Hikan-zakura[緋寒桜（ヒカンザクラ）]): That is native to southern China and Taiwan, and it was introduced into Okinawa where is a famous spot of Kanhi-zakura blossoms. THat is an early blooming Sakura.
Kawazu-zakura[河津桜（カワズザクラ）] is an early blooming Sakura. Kawazu-zakura was discovered at Kawazu town, Shizuoka Pref. It is said that Kawazu-zakura is a natural hybrid of Ōshima-zakura & Kanhi-zakura.
Kawazu-zakura along the Sakagawa River, Matsudo, Chiba
Kawazu-zakura at Shimogamo spa[下賀茂温泉（しもがもおんせん）], Shizuoka
Shidare-zakura[枝垂桜（シダレザクラ）]: That is a general term for Sakura which has drooping branches like a weeping willow. These are grace and beautiful.
Yae-zakura[八重桜（ヤエザクラ）]: That is a general term for double flowered cherry trees. These have big blossoms. And these blossoms are sometimes salted and used for the topping of An-pan[あんパン] and Sakura-yu[桜湯（さくらゆ）] which is a hot water with salted Sakura blossom.
Yōkō-zakura[陽光桜（ようこうざくら）] at Jyunsai-ike park
Amagi-Yoshino[アマギヨシノ] at the East Gardens of the Imperial Palace