PLATE 12
Non-Glandular Multicellular Hairs
Shepherdia canadensis, [L.] Nutt.
PLATE 13
Multicellular Multiseriate Branched Hairs
1. Basal hairs of erigeron (Erigeron canadensis, L.).
2. Apical hairs of erigeron (Erigeron canadensis, L.).
3. Basal hairs of aromatic goldenrod (Solidago odora, Ait.).
4. Apical hairs of aromatic goldenrod (Solidago odora, Ait.).
The hair of grindelia (Plate 14, Figs. 3 and 4) has very thick walls with numerous elongated pores. The apex of the hair terminates in a cluster of cells with short, free, sharp-pointed ends. The basal branches (Plate 14, Fig. 4) are longer than the apical branches.
Boneset hair (Plate 15, Figs. 1 and 2) has non-porous walls. The apex of the hair terminates in two blunt-pointed cells. The terminal wall is thicker than the side wall. Some of the branches lower down terminate in cells with very thick or solid points. The basal branches (Plate 15, Fig. 1) are longer, but the cells are narrower and more strongly tapering than are the branches of the apical part of the hair.
Life-everlasting (Plate 15, Figs. 3 and 4) has uniformly thickened but non-porous walls. The hair terminates in two blunt-pointed, greatly elongated cells.
The basal branches (Plate 15, Fig. 4) are narrower, slightly tapering, and the base of the branches frequently curve downward.
The cell cavities of these hairs are filled with air.