Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 May 1;9:517. doi: 10.3389/fpls.2018.00517

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2018 Stucky, Guralnick, Deck, Denny, Bolmgren and Walls.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Latitudinal trends in flowering times for (A) maples (Acer) in the 2010s and (B) lilacs (Syringa) in the 1960s. Each dot represents the earliest estimated flowering time for a 0.1°-by-0.1° geographic grid cell. These decades were chosen because they had more even distribution of records between North America and Europe in comparison to other decades with available data. Note that these graphs are intended merely to demonstrate the utility of the PPO for large-scale data integration and analysis; they should not be construed as robust phenological analyses.