ニューヨーク植物園さんのインスタグラム写真 - (ニューヨーク植物園Instagram)「If you’re feeling shy, the Ross Conifer Arboretum might be the collection for you—where the trees are equally so! 🌲 You may have seen “Crown Shyness” at NYBG before, a phenomenon where certain tree species—and in some cases, different species—refuse to touch branches and leaves as they grow, instead creating channels that look like rivers on a map. While scientists aren’t sure exactly why, the theory is that it helps trees avoid spreading diseases or pests from one to the next. So the next time you find yourself surrounded by trees, don’t forget to look up! You might find a fascinating surprise in the canopy. #Pinus densiflora ‘Umbraculifera’ #plantlove」8月31日 2時51分