. d. Leaf of ditto ; e. Section of stem of Cycas. The mode of fertilization and nature of the seeds (fruit) of the plants in this family is of a special cha- racter. The flowers so called are unisexual, and desti- tute of calyx and corolla; the male consists of sessile anthers, seated on the scales of cones or catkins, the female being represented by an ovule only, destitute of ovary, style, and stigma; fertilization being effected by the pollen coming in direct contact with the apex of the naked ovule, which in time becomes an albuminous nut- seed, destitute of a true seed coat.

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbo, booksubjectbotany