Portal de Periódicos da CAPES

Studies of Diospyros Kaki. I

1915; University of Chicago Press; Volume: 60; Issue: 5 Linguagem: Inglês

10.1086/331674

1940-1205

Kono Yasui,

Plant Taxonomy and Phylogenetics

1. Diospyros Kaki is not a dioecious plant, but a monoecious one whose staminate flowers are disappearing under cultivation. 2. The monoecious habit might have been derived from a condition of perfect flowers; therefore this habit is not a primitive character in this species. 3. Perfect flowers do not indicate the primitive character of the variety in which they occur; they appear among other varieties only through restoration of lost parts. 4. The primitive character of Ebenaceae among Sympetalae is indicated by the spiral arrangement of petals; the stamen situation, although the number of stamens is not definite; and the two integuments. 5. Megaspore formation is also of a primitive character, and suggests, along with other characters of the family, that it may have some relation to the Myrtiflorae. 6. There is no parietal tissue in the microsporangium, which indicates that Ebenaceae come from some higher family of Archichlamydeae, because in the lower families parietal tissue usually occurs in the megasporangium. 7. Embryo sac formation occurs in the usual way, and in general furnishes no evidence for the evolution of dicotyledons. It is true in general, of course, that the gametophytes of angiosperms are of less value for evidence concerning evolution than the sporophytes. 8. The 2x number of chromosomes is 56 or 54.