Anatomy and Histology of the Eureka Lemon

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Abstract
The ontogeny and histology of the floral organs, except ovules, of a well known commercial var. of Citrus limonum are described. The gynoecium is considered to be a whorl of carpels undiverged from one another and from the apex of a receptacle which extends past the placenta. Development of the fruit involves a period of cell division throughout the ovary, followed by one of cell differentiation. The rind consists of a compact exocarp in which oil glands are present and a spongy mesocarp. The pulp consists of a thin endocarp to which the juice sacs are attached, and the septa. The core represents the receptacular axis and the marginal portions of the carpels. Some oil glands originate early, others late in development of the carpels. Primordia of juice sacs appear on outer adaxial surfaces of the carpels before the flowers open. Juice sacs consist of epidermis and mesophyll of the carpels. Separation of the sectors of the pulp from one another and from the rind and core of the fruit is made possible by development of a spongy area in the tissue adjacent to the adaxial epidermis of each carpel.