Part 135. The mint family (Labiatae). Examples: sage (Figs. 132, 133), thyme (Fig. 134), spearmint (Fig. 135), summer savory (Fig. 136), sweet marjoram (Fig. 137), and peppermint (Figs. 146 I, II).

The formulas of Mentha, Thymus, Origanum, Satureia, Salvia, and Labiatae are given on pages 418, 419.

When a gamopetalbus corolla has the two upper petals coalescing with one another more completely than they do with those at the side, and the two lateral ones in turn more completely coalescing with the lower petal, there results a two-lipped or labiate 1 form shown especially well in Salvia and most other members of the family. It should be noted, however, that more or less labiate corollas occur also in many genera of the figwort family and some other families of the group we are now studying. Typical members of the mint family are easily recognized as square-stemmed, aromatic herbs with opposite leaves, labiate corolla and schizocarpic fruit of four nutlets. As in the figwort family the juice is watery, the leaves exstipulate, the petals imbricate, and the stamens generally four, but the seeds are exalbuminous and the embryo uncoiled.

1 La'bi-ate - L. labium, lip. P|).

Part 136. The Phlox Order

Part 136. Phlox order (Polemoniales or Tubiflorae), embraces a number of families besides the four just mentioned. In general they are characterized by having perfect, regular or irregular, gamopetalous flowers, with two to five stamens adherent to the corolla, and distinct; the anthers seldom poricidal; the ovary compound and superior.

For the formula of Polemoniales see pages 418, 419.