شمال أمريكا الجنوبية
Trelease wrote many scientific articles and monographs. His work on the Piperaceae of Northern South America, left unfinished at his death, was completed by his student Truman G. Yuncker. He also wrote several more popular botanical and gardening books, such as "Plant materials of decorative gardening" (1917) and "Winter Botany" (1918).