PLATE 97 
PowpEerRED Horenound (Marrubium vulgare, L). 
1. Epidermis of leaf showing the wavy epidermal cells, stoma, and a 
clustered hair. 2. Surface view of the petal epidermis. 3. Non-glandular 
hair from the calyx or corolla. 4. Long, thin-walled, twisted, non-glandular 
hairs from the leaves and stem. 5. Unicellular non-glandular hair from the 
tube of the corolla. 6. Glandular hairs with a one-celled stalk and with two 
secreting cells divided by vertical walls. 7. Surface and side view of the 
eight-celled glandular hairs. 8. Conducting cells. 9. Fibres from the stem. 
10. Pollen grains. 
