Earthwise Aware

Ha! 💚 I am mesmerized by the tiny stalked hairs with their bulbous, secretion-filled tips that make the bud surface glisten. These are glandular trichomes on the sepals and outer surfaces of the flower buds of hairy beardtongue (Penstemon digitalis) just as they are about to open. Each little "dot" is a short hair topped with a clear, rounded gland that catches the light and sometimes merges with neighboring droplets. The stalks are relatively short, while the heads are swollen and translucent, giving the buds a dewy, resinous appearance rather than the matte fuzz produced by non-glandular hairs.

I am learning that these trichomes secrete a mixture of compounds that make the bud tips tacky. At this early stage of development, the secretions may help deter small herbivores, interfere with tiny crawling insects, protect delicate tissues from drying, and modify the immediate environment surrounding the developing flower.

Looking closer, on my garden's hairy beardtongue buds, the trichomes are densest along the margins and tips of the sepals, exactly where the tissue is about to separate and reflex as the flower elongates. As the buds open, these glistening projections will become less visually dominant. For now, though, they form a spiky armor around the floral parts still tucked safely within.

It is hard not to stop and admire them. Even before the flowers open, the plant has already invested in a remarkable layer of structure and chemistry, a tiny defensive landscape guarding the next stage of its reproductive journey.

Claire at EwA | EwA Pheno Lite observation → www.anecdata.org/posts/view/329010 |