4to (324 x 247 mm). 50 chromolithographed plates. (Spotting, some plates yellowed.) Publisher's dark green cloth, covers and spines gilt-lettered (recased with repairs to spine ends, some bubbling or wrinkling of the cloth to upper cover vol. II). 

FIRST EDITION in book form. Originally published in parts and issued with wrappers, the title was altered and the work was issued in the present 2 volume set in 1882. Lithographs by Armstrong & Co. after the illustrations by Sprague, considered one of the finest botanical artists of his day.