Mr. B. H Hill of Neodesha, Kan., last summer took us to see a colony of Cooperias occupying a high, rocky pasture of the farm of Mr. Howard Hill, his brother, near the village of La Fontaine. Indeed, he gave us two introductions to this colony in its two very strikingly different aspects: First, in May, when the Cooperias appeared above the ground each as a cluster of grasslike leaves only (figs. 2, 3), and again in early September when each plant stood before us as a single flower on a slender scape (fig. 1), unaccompanied by even a vestige of a leaf. This colony has been familiar to Mr. Hill from his boyhood and through the years he has noticed the unvarying habit of the appearance of leaves only in the spring and of flowers only in late August or early September, always immediately after the first rainfall of that period. When we first went to the pasture on May 19, two close associates of the Cooperias were in bloom, Zygadenus nuttallii and Opuntia humifusa, and the Cooperia leaves were in their photosynthetic prime (figs. 2 and 3) and truly in danger of being wiped out by grazing cattle but for their close nestling against the rocks and formidable cacti. At other parts of the extensive pasture where surface rocks ceased and no cacti were growing Cooperias also were absent.