humus, humi, = the earth, the ground, the soil; on the ground;
-ilis, = indicates capacity or ability. Hence a property or quality.
humilis, = on the ground, i.e. low, lowly, small, slight. (ld, BL)
Sarnia, Ontario, Canada;
-ensis, = indicates country or place of growth, or origin or else habitat.
(the plant Nerine sarniensis was mistakenly thought to have originated on the Channel Islands (Caesarea Insula) as the bulbs lost on a wrecked ship were washed up on Guernsey) (BL, LB)