Originally Posted By: BranShea
Tuber morphology, germination behaviour and propagation efficiency in three …
K Joseph John, VT Antony, J Marydas, R … - Genetic Resources and …, 2009 - Springer
... In undisturbed pots, it was 60, 120 and 128 days, respectively. Invariably all the
three species started sprouting by the end of Febru- ary. Moisture loss and aeration
may be the factors responsible for hascent (early) sprouting. ...

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Some of the quotes with hascent (like the Cox one, and this ) do seem to be a straightforward mistyping of nascent, but this germination quote stands out. Sprouting is itself a nascent state, so it is redundant to describe it as one. "Nascent sprouting" also doesn't express what is told through context, which is that the sprouting is not so much nascent as it is hastened. I've seen the word hascent once before, and I wonder if it is similar to hastened and somehow slipped through the cracks.