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Capsicum annuum
Cayenne is generally hot by most people's standards, ground spices can lose flavor over time and some varieties are hotter than others. Also I have found growing conditions play a role in heat, with drought-like conditions contributing to higher capsaicin concentrations. I once had some banana peppers, of which even the hottest variety I would consider mild, that exceeded the heat level of a jalapeno. They were grown in a year of drought, on a hillside garden, in full sun, and without watering.
But it's a bit hot and spicy, is Cayenne hot? I've only had ground Cayenne which really isn't hot.