At Fontevrault shows a development of the crown; the trefoil heads are expanded, and are chased and jewelled.
Greater freedom of moulding and the use of trefoil and cinquefoil may be, but need not be, explained in this way.
In the more damp and marshy places the bottom is covered with marsh trefoil, carex, smooth equisetum, and rush.
When the summits of these are worn by mastication their surfaces present circles of dentine surrounded by a border of enamel, and as attrition proceeds different patterns are produced by the union of the bases of the cusps, a trefoil form being characteristic of some species.
The temporary includes vetches, pulse, lupine, clover and trifolium; and the perennial, meadow-trefoil, lupinella, sulla (fledysarum coronarium), lucerne and darnel.
The badge of the combined order is composed of the white cross with trefoil termination of St Lazarus resting on the green cross of St Maurice; both crosses are bordered gold.
Lucerne and a trefoil called shaftal form important fodder crops in the western parts of the country, and, when irrigated, are said to afford ten or twelve cuttings in the season.
In the United States, Canada, Australia, New Zealand and in many other parts of the world honey of the finest quality is obtained from this " queen of bee-plants," and in lesser degree from other clovers such as sainfoin, alsike (a hybrid clover), trefoil, &c.
On the other hand, in Merycopotamus, of the Lower Pliocene of India and Burma, the upper molars have lost the fifth intermediate cusp of Ancodon; and thus, although highly selenodont, might be easily modified, by a kind of retrograde development, into the trefoil-columned molars of Hippopotamus.