. Characteristics and hybridization of important intermountain shrubs. Rosacea; Shrubs Rocky Mountains Region; Shrubs Great Basin. Figure 16.—True mountain mahogany showing a typical twisted plumose aohene (near center).. The slowing effect of elevation on flower and fruit development is well demonstrated by this species. On June 18, 1967, at an elevation of 2,380 m (7,800 feet), true moun- tain mahogany was in late flower. Only 2 days later, at an elevation of 1,830 m (6,000 feet), it was in late fruit. True mountain mahogany averages 59,030 cleaned seeds per pound (130/g) (Plummer and others
. Characteristics and hybridization of important intermountain shrubs. Rosacea; Shrubs Rocky Mountains Region; Shrubs Great Basin. Figure 16.—True mountain mahogany showing a typical twisted plumose aohene (near center).. The slowing effect of elevation on flower and fruit development is well demonstrated by this species. On June 18, 1967, at an elevation of 2,380 m (7,800 feet), true moun- tain mahogany was in late flower. Only 2 days later, at an elevation of 1,830 m (6,000 feet), it was in late fruit. True mountain mahogany averages 59,030 cleaned seeds per pound (130/g) (Plummer and others 1968). There is a wide variation in ecotypes both geographically and by elevation. Leaf size and shape are variable (fig. 12). A number of small-leafed true mountain mahogany shrubs occur west of Richfield, Utah, on the lower foothills of the Pahvant Range. These appear to be a distinctly different ecotype than those growing elsewhere. The chromosome number of true mountain mahogany is 2n - 16 (Pyrah 1964). Hybridization: Our observations indicate that the stigmas of true mountain mahogany mature before the stamens. Consequently, we believe artificial hybridization by mass pollination would be possible when the flowers first open. Natural hybridization between the deciduous C. montanus and the evergreen species C. ledifolius and C. intricatus occurs at many places in Utah where their ranges overlap (fig. 13). Plummer and others (1957) reported that the more vigorous semievergreen hybrids of C. montanus X C. ledifolius are relatively common in Utah, particularly along the west slopes of the Wasatch Plateau and the Wasatch Mountains. Pyrah (1964) observed that hybrids of C. ledifolius X C. intricatus are common because their flowering periods overlapped. He found that hybrids of C. montanus X C. ledifolius are less common because of a 2-week flowering period difference between the parental species. Hybridiza- tion between C. montanus and C. intricatus was reported to be rare (
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