. Brigham Young University science bulletin. Biology -- Periodicals. BIOLOGICAL SERIES. VOL. 11, NO. 3 N.'\TIVE TREES OF UTAH 15 UTAH OUTLINE MAP. Fig. 26. Crataegus rivularis Nun. and range province of western Utah and uncommon in the isolated ranges of southeastern Utah. Representative Specimens: Box Elder Co., Corinne, A. Wetmore 347, July 1. 1915 (US); Daggett Co., Sheep Creek. L. Williams 521. June 3, 1932 (UTC); Duchesne Co., Red Creek, EH. Graham 9448. June 27. 1935 (CM); Duchesne Co., Roan Plateau (west), Willev 24, Mav 23, 1918 (USPS); Millard Co., Canyon Mts., Robins 105, A
. Brigham Young University science bulletin. Biology -- Periodicals. BIOLOGICAL SERIES. VOL. 11, NO. 3 N.'\TIVE TREES OF UTAH 15 UTAH OUTLINE MAP. Fig. 26. Crataegus rivularis Nun. and range province of western Utah and uncommon in the isolated ranges of southeastern Utah. Representative Specimens: Box Elder Co., Corinne, A. Wetmore 347, July 1. 1915 (US); Daggett Co., Sheep Creek. L. Williams 521. June 3, 1932 (UTC); Duchesne Co., Red Creek, EH. Graham 9448. June 27. 1935 (CM); Duchesne Co., Roan Plateau (west), Willev 24, Mav 23, 1918 (USPS); Millard Co., Canyon Mts., Robins 105, August 16, 1913 (USPS); Piute Co., Monroe Mt., A'.S, Erdman 2762, September 3, 1965 (Weber State College); San Juan La Sal Mts., Cottam 2288, June 16. 1927 (BRY);San Pete Co., Ephraim Canyon, WW. Eggleston 10113, May 20-26, 1914 (US); Uintah Co., Dinosaur Nat'l. Monu., Holmgren & Holmgren 14245, June 29, 1962 (NY); Utah Co., Provo, KS. Erdman 334, July, 1959 (BRY). Crataegus siicculenta Schrad. (Fig. 27) This hawthorne is widespread from New England to Colorado and Arizona, but the only record in Utah is from along the Provo River where it cuts through the Wasatch Mountains. Representative Specimens: Utah Provo Garrett 8439. May 20. 1942 (UT); Utah Provo Canyon. Welsh 1882, October 2, 1962 (BRY). Fraximts aiwmala Torr. (Fig. 28) Unlike other species of the genus Fraxiniis which have compound leaves, F. anomala usually has simple leaves. Occasionally, however, one can find single-leaf ash with at least a few compound leaves which is more typical of the genus. The single-leaf ash grows throughout Utah's Colo- rado plateau region where it may be a common member of the pinyon-juniper forest. Apparently it has inigrated up along the Green River into the Uinta Fig. 27. Crataegus siicculenta Schmd. Basin, its northern most site in Utah. Its only Great Basin location in Utah is just over the divide north of Washington County. Represent
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