Germination of Seed of Three Varieties of Spotted Locoweed

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Abstract
Spotted locoweed (A. lentiginosus Dougl.), one of the principal locoweeds of western rangelands, consist of 36 varieties. Factors influencing seed germination of the species were determined. Five seed collections were studied; they represented 5 different geographical and edaphic locations. Three varieties [A. l. var. albiflorus, A. l. var. araneosus, A. l. var. salinus] of spotted locoweed were represented by these collections. The seed coat of the varieties studied was impermeable to water. Seed also contained a water-soluble germination inhibitor. Germination was not affected by light. Optimal germination occurred at the temperature regime 7/13.degree. C. At -1/4.degree. and 21/27.degree. C, although it was slower, high percentage germination was ultimately achieved. Although salinity inhibited germination, seed from the different sources showed different tolerances to salinity.

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