PLATE 9
Multicellular Uniseriate Non-Branched Hairs
1. Digitalis leaf (Digitalis purpurea, L.).
2. Arnica flower (Arnica montana, L.).
3. Western skullcap plant (Scutellaria canescens, Nutt.).
4. Eastern skullcap plant (Scutellaria lateriflora, L.).
5. Peppermint leaf (Mentha piperita, L.).
6. Thyme leaf (Thymus vulgaris, L.).
7. Yarrow flowers (Achillea millefolium, L.).
8. Wormwood leaf (Artemisia absinthium, L.).
9. Sumac fruit (Rhus glabra, L.).
Digitalis hairs (Plate 9, Fig. 1) are made up of a varying number of uniseriate-arranged cells of unequal length, frequently placed at right angles to the cells above and below; the walls are of a whitish color, and are rough or smooth.
Eastern skullcap (Plate 9, Fig. 4) has hairs with not more than four cells; these hairs are curved, and the walls are whitish, sometimes smooth, but usually rough. In Western skullcap (Plate 9, Fig. 3) the hairs have sometimes as many as seven cells. The walls are white and rough, and the individual cells of the hair are much larger than are the cells of the hairs of true skullcap.
Peppermint (Plate 9, Fig. 5) has from one to eight cells. The hair is curved, and the walls are very rough.
Thyme (Plate 9, Fig. 6) has short, thick, rough-walled trichomes, the terminal cell usually being bent at nearly right angles to the other cells.
Yarrow hairs (Plate 9, Fig. 7) have a variable number of cells. In all the hairs the basal cells are short and broad, while the terminal cell is greatly elongated.
Arnica hairs (one form, Plate 9, Fig. 2) have frequently as many as four cells, the terminal cell being longer than the basal cells. The walls are white and smooth.
Sumac-fruit hairs (Plate 9, Fig. 9) have spindle-shaped, reddish-colored hairs.