. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. i^ju uj killed the plant tissues. Our experiments at inducing male sterility with Ethrel® failed to uncover any differential action on pollen and ovule formation such as occur on wheat and other grasses (Rowell and Miller 1971). Our experiments with more conventional techniques; namely, mass pollination, were more successful, but the results were not definitive (see table 2, page 28). The Tvidentatae do not appear to be self-ster
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. i^ju uj killed the plant tissues. Our experiments at inducing male sterility with Ethrel® failed to uncover any differential action on pollen and ovule formation such as occur on wheat and other grasses (Rowell and Miller 1971). Our experiments with more conventional techniques; namely, mass pollination, were more successful, but the results were not definitive (see table 2, page 28). The Tvidentatae do not appear to be self-sterile (table 2). Seed was set in the unopened control bags. We cannot make the case for self-compatibility point as strongly as we would like to, however, because the pollination bags sift small amounts of pollen. The bakery bags sifted no more pollen than commercial paper and woven cloth bags pre- pared specifically for hybridization experiments. We (McArthur and Blauer, data on file at the Shrub Sciences Laboratory, Provo, Utah) found only minimal amounts of pollen on petroleum-coated microscope slides inside of the control bags. These tests were made primarily with Atvirplex pollen but also with Artemisia pollen and unidentified pollen. Pollen does not sift into the bags in quantity enough to produce seed sets of up to 300 seeds per pollination bag (table 2). Apparently, therefore, selfing occurs. We believe, above and beyond the background of selfing, hybrid seed is also set. Our 3 years' data (table 2) show a trend for higher interpopulation and intrapopulation seed set than seed set in the control bags (selfing and sifting). The differences are not significant, perhaps because of the wide variations in seed set in the bags. The environment within the bags was not natural. l\rhen the bags were opened, some enclosed branches \<ere drier and some more moist than adjoining unbagged branches. CHARACTERISTICS OF THE GENUS CHRYSOTHAMNUS (RABBITBRUSH) This genus consists of muc
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