in Thoreau’s Journal:

Clintonia borealis in a day or two. Its beauty at present consists chiefly in its commonly three very handsome, rich, clear, dark-green leaves….They are perfect in form and color, broadly oblanceolate, with a deep channel down the middle, uninjured by insects, arching over from a centre at the ground; and from their midst rises the scape, a foot high with one or more umbels of green, bell-shaped flowers, –– yellowish-green, nodding or bent downward, but without fragrance.

In fact, the plant is all green, both leaves and corolla. The leaves alone—and many have no scape—would detain the walker.  Its berries are its flower.