Growth form indeterminate

Indeterminate, ascending, or centripetal inflorescence is that form in which the flower buds are axillary, while the terminal bud continues to develop and increase the growth of the stem indefinitely. Example the Geranium. 

Infection of host cells is achieved as bacteria are released from the unwalled tips of infection threads (Fig. 1C) into newly formed nodule initials (Newcomb, 1981 Sutton, 1983). While infection of cells in indeterminate nodules appears to be solely throu infection threads, a second mode of infection through subsequent division of previously infected cells can occur in determinate nodules. The proliferation of the infection thread into legume host cells involves a delicate balance between bacterial penetration and plant wall resistance (Long and Cooper, 1988). Only 40 to 60% of all nodule cells are infected, and in effective associations this occurs without inducing a disease resistance response. To date one of the least well-understood phases of symbiosis is that of how infection thread growth is regulated and why cellular infection is selective. 

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