Development of Embryo Sac in Grindelia squarrosa

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Abstract
The embryo sac develops in the typlcal manner from the chalazal macrospore of a row of 4. Only 2 antipodal cells are formed, the one nearer the micropyle having 2 nuclei. These cells persist and undergo further development, one or both growing into the integument to form lateral haustoria. Nuclear divisions and possibly nuclear fusions occur in these haustoria but no instances of cell division were observed. The primary endosperm nucleus divides before the zygote nucleus, and free endosperm nuclei are formed. The diploid chromosome number is 12. The author gives what is intended to be a complete resume of all previous work on embryo sac development in the tribe Astereae of the Compositae.

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