The Role of Spur Leaves, Bourse Leaves, and Fruit on Local Flower Formation in Apple: An Approach to Understanding Biennial Bearing in: HortScience Volume 52 Issue 9 (2017)
Spur (botany) - Wikipedia
Scourge of the Sandspur | Friends of Shell Key
Spur shape in natural population Impatiens oxyanthera. Nectar spur in... | Download Scientific Diagram
Nectar spur - Wikipedia
Toilet Paper Plant aka Blue Spur Flower | Little River Cooperative