adelpho-, adelph-, -adelphia, -adelphous +
2. The largest city of Pennsylvania, in the southeast part of the state on the Delaware River; City of Brotherly Love: Philadelphia was founded as a Quaker colony by William Penn in 1681 on the site of an earlier Swedish settlement.
The First and Second Continental Congresses (1774 and 1775-1776) and the Constitutional Convention (1787) met in the city, which served as the capital of the United States from 1790 to 1800.
A philadelphus has white sweet scented flowers which grow either as a single flower or in clusters or bunches and thrives best in temperate regions.