Abstract

1. The steps in the early embryogeny of Cupressus arizonica are described. 2. The number of archegonia in a complex is found to range between 3 and 13. 3. More embryo systems were observed than could be accounted for on a basis of two fertilizations per pollen tube, indicating multiple fertilizations from multiple male cells. 4. The steps in the embryogeny, except for the speed of their passage and the insertion of a winter rest period, closely parallel those of Biota orientalis. 5. The resemblance of the embryogeny of C. arizonica to that of Biota is taken as further evidence that Endlicher's genus Biota is valid, and that it more closely resembles Cupressus than Thuja, with which it is sometimes combined.

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