Most Recent Review
Mis-identified plant in lesson
I haven't fully reviewed the lesson but I immediately noticed that the plant in the image is NOT a burr (cocklebur, Xanthium strumarium) but is a teasle (also spelled teazle or teazel, Dipsacus spp.--there are about 15 different teasel species). Having the correct image is important because the lesson focuses on how cocklebur is distributed by sticking to the fur of animals that come into contact with it. The teasel, as you can see in the image, lacks the hook-like spiny bract that cockelbur has. Thus, teasel would not stick to a mammal's fur or a bird's feathers, as would the hooked, spiny bract of the cocklebur flower. Based on this incorrect image of the plant germane to this lesson, I would be wary of the rest of the science content in this lesson.