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Tes8s wintergur (St&a k&cot&ha Trin. & Rupr.) is 8n importint cool-serron, perennl8l for8ge gr8ss in Tcur. Seed kndling problems urd 8 limited knowledge of germination 8nd est8blishment requirements have severely lhnited its use in reveget8tioa progmms. This study ~8s designed to chrrclcterize floret morphoiogy urd investigate the effects of different temperature X w8ter potenti8l regimes on germin8tion responses of ch8smog8mous 8nd b8s8l8xill8ry cieistog8mous florets from 2 Tests rrintergriss popul8tions in central Text. Germination responses were evrluated 8t polyethylene glycol-inducsd w8ter potenti8ls of 0, -0.25, -0.50, -0.75, 8nd -1.0 MP8 under 8ltenuting temper8ture regimes of 10/20,15/25, and 201300 C in controlled environment ch8mbers. Awns contributed most to the weight of ch8smog8mous florets, while cuyopsss contributed most to the weight of cleistog8mous florets. Cieistog8mous florets generally hrd higher cumulrtive germhutioo percent8gee 8nd slower germh18tioo nta th8n ch8smog8mous florets in the vuious temperature X water potentkl reghnes. Cumul8tive germhutioo percentrgen of both floret types were greatest 8t substrate w8ter poteoti8ls of 0 8nd -0.25 MPa in the lo/200 C temper&we reghne, 8nd me8n germhution times were most npid 8t the 0 MPa subante water potenti in the lS/250 C temperature regime. Bued upon se8son8l temperrture md moisture conditions in centrrl Teur, germhmtion from n8tur8l seed b8nks or 8rtifici81 seedings should occur prhn8rily between l8te September urd mid-November, 8nd occasion8lly from Decemba through Febru8ry during mild winters.

Characterization and Germination of Chasmogamous and Basal Axillary Cleistogamous Florets of Texas Wintergrass