Page:Wayside and Woodland Blossoms.djvu/59

Rh pratensis, but smaller, with the flowers more inclined to purple. The Sage of the kitchen-garden is S. officinalis; not a native plant. The name Salvia is from the Latin Salvo, to save or heal, from its former great repute in medicine.

Most labiate flowers produce honey from the base of the ovary; and this, of course, is a distinct bribe to insects to visit them. It would not be an economical arrangement for a flower to provide honey for all comers without the plant getting a quid pro quo: we therefore find all sorts of "dodges" to ensure a service being done by the honey-seeker. As we have shown in the Bugle, the anther and stigma occupy the arch of the upper lip. As a rule the ripe anthers first occupy the foremost position, so that if a bee alights on the lower lip and pushes into the corolla for the honey his hairy back will brush off the pollen from the anthers. After the honey is shed the stigmas come forward and occupy the former position of the anthers. Should a bee that has got dusted with pollen at an earlier flower now pay a visit the stigmas will collect some pollen from his back and the ovules become fertilized. This is the general plan in the order Labiatæ, but there are modifications in each genus.

In describing the Wall Barley we gave a general idea of the structure of grass flowers, and those of Poa are very similar to those of Hordeum; but the flower-cluster (inflorescence) is very different. In Hordeum (which see) this is a spike, bearing many three-flowered spikelets on each side. In Poa it is more branched and diffuse, and is called a panicle. In P. annua the branches grow two together, and are branched again. The spikelets are not awned as in Hordeum. There are eight British species of Poa, which, however, we have not space to