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Early-Spring Blue Grama Inflorescences from Fall-Initiated Spikes¹

Blue grama (Bouteloua gracilis (H.B.K.) Lag. ex Steud.) was discovered flowering less than 1 month following severe winter weather, and 2 months before the normal onset of heading in native range near Hays, Kans. Variable spike damage was an indication of freezing or drought injury to the inflorescences during early development. The short interval between start of growth and spike exertion under field and experimental conditions suggests the early spikes were initiated the previous fall, started to develop, went into winter dormancy, and completed development during the earliest favorable growth period in the spring.

Key Words: Precodius flowering • Damaged spikes • Aborted spikes • Photoperiodism

² Professor of Pasture Management and Associate Agronomist. Ft. Hays Branch Exp. Sta. Hays, Kans. 67601.

Received for publication March 14, 1969.