The Magazine of the Arnold Arboretum VOLUME 74 • NUMBER 4 The Magazine of the Arnold Arboretum VOLUME 74 • NUMBER 4 • 2017 CONTENTS Arnoldia (ISSN 0004–2633; USPS 866–100) 2 The Wardian Case: How a Simple Box is published quarterly by the Arnold Arboretum Moved the Plant Kingdom of Harvard University. Periodicals postage paid Luke Keogh at Boston, Massachusetts. Subscriptions are $20.00 per calendar year 14 2016 Weather Summary domestic, $25.00 foreign, payable in advance. Sue A. Pfeiffer Remittances may be made in U.S. dollars, by check drawn on a U.S. bank; by international 23 Witness Tree: What a Single, 100-Year-Old money order; or by Visa, Mastercard, or American Oak Tells Us About Climate Change Express. Send orders, remittances, requests to purchase back issues, change-of-address notices, Lynda V. Mapes and all other subscription-related communica- tions to Circulation Manager, Arnoldia, Arnold 32 Through the Seasons with Sassafras Arboretum, 125 Arborway, Boston, MA 02130- Nancy Rose 3500. Telephone 617.524.1718; fax 617.524.1418; e-mail
[email protected] Front cover: A specimen of Yeddo spruce (Picea Arnold Arboretum members receive a subscrip- jezoensis, accession 502-77-A) displayed new seed tion to Arnoldia as a membership benefit. To cones and shoots on May 6, 2016. Photo by William become a member or receive more information, (Ned) Friedman. please call Wendy Krauss at 617.384.5766 or email
[email protected] Inside front cover: A showy pink-flowered cultivar Postmaster: Send address changes to of flowering dogwood (Cornus florida‘Royal Red’, accession 13-61-A) was in full bloom on May 9, 2016.