Charles E. Olmsted

TL;DR: The results show definitely that a widely ranging native species may be so differentiated in its photoperiodic requirements that its assignment to a particular photoperiumic class may be generally invalid unless based on material from a wide latitudinal range.

TL;DR: It was concluded that in this species the loss of green color and leaf abscission under natural conditions are basically conditioned by the naturally decreasing autumnal photoperiod, which may critically condition the aging process leading to abscissions.

TL;DR: A tendency was noted for a relative increase in the numbers of primordia differentiated, at the upper crown nodes and on tillers, by plants on which no nodal roots had become established.

TL;DR: The series of photoperiodic types within side-oats grama raises interesting questions as to the evolution and nature of the responsible genetic and physiological mechanisms, since the species probably originated in low latitudes, where the short-day response is typical, with subsequent adjustment to the longer days encountered in the northward extension of its range.

TL;DR: Mechanical analysis, moisture equivalent, loss on ignition, and acidity values of the soils of various communities show differences related primarily to the presence or absence of erosion and deposition phenomena.