pentamerous arrangement so commun in Dicotyledons, and it would 
appear that the bias of Monocotyledons is primarily towards having 
flowers, the parts of which are in multiples of 3, and secondarily in 
multiples of two. In Dicotyledons we have the central metamorphosed 
flower of the common carrot, Adoxa Moschatellina, L., in which the lateral 
flowers are pentamerous and the terminal flower tetramerous, and Cheno- 
podium rubrum, L., in which the terminal flowers are pentamerous and the 
lateral trimerous with 1 or 2 stamens (Koch.). 
Expianation oF Pirate LXXXVIIL—Fig. 1, an inner, and fig. 2, an 
outer segment of the perianth of the natural size. Fig. 8, a stamen of 
the natural size, magnified at fig. 4. Fig. 5, the ovary, the perianth 
_ segments, and stamens being removed, with part of pedicel of the 
natural size. Fig. 6, transverse section of the ovary of a tetramerous 
flower, magnified. Fig. 7, dehiscent capsule of a tetramerous flower, 
slightly enlarged, and fig. 8, the same of a trimerous flower. Fig. 9, one 
valve of a capsule, slightly enlarged. 
