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• W2510016979 abstract "Eriophyllum congdonii and E. nubigenum, rare taxa, have also been treated as E. nubigenum and E. nubigenum var. congdonii. Study of F„ F2, and F3 plants shows that experimentally the taxa are interfertile but the morphological differences that separate them in nature are maintained in the greenhouse. They should be treated as species. Eriophyllum nubigenum Greene and E. congdonii Brandegee are annuals known from about 10 sites in a 900 km2 area of Mariposa Co., California (Fig. 1). The California Native Plant Society inventory of rare and endangered species lists them as R-E-D: 2-1-3. Their state/federal status is CR/C3c (Smith and Berg 1988). Eriophyllum nubigenum is based on a Curran collection from Cloud's Rest (A. Gray 1883) and until 1980 was known only from collections there and at three other montane sites in Yosemite National Park. Brandegee (1899) named a similar but lower elevation taxon E. congdonii. He based on material given him by Congdon, who called E. nubigenum. Until 1981 E. congdonii appeared to be restricted to a Merced River locale near El Portal. The taxa closely resemble each other, but seemed to occur at different elevations. Taxonomie treatments differ: Jepson (1925) treated E. congdonii without mentioning E. nubigenum (one assumes an oversight). Constance (1937) listed E. congdonii as a of E. nubigenum. Abrams and Ferris (1 960) followed Brandegee, whereas Munz (1 959) followed Constance. Constance commented that the taxa present an interesting problem in determination of specific delimitations (p. 1 1 5), and suggested that habitat differences associated with elevation might account for differences in pubescence and in size and number of some structures. He interpreted them as extremes, ascribing the gap to inadequate collecting. The variety is the normal state of the plant, while the type of the species is a dwarfed alpine representative of it (p. 1 1 6). According to him, inadequacy of material allowed E . congdonii to be retained as a variety, and additional collections might permit eliminating as a variety. This was a reasonable treatment when E. nubigenum had not been collected Madrono, Vol. 38, No. 4, pp. 213-226, 1991 This content downloaded from 207.46.13.142 on Fri, 10 Jun 2016 04:35:14 UTC All use subject to http://about.jstor.org/terms 214 MADRONO [Vol. 38 Fig. 1. Distribution of Eriophyllum congdonii and E. nubigenum, Mariposa Co., California. since 1897, and might be extinct (Botti 1982a), and when E. congdonii seemed to be a low elevation taxon restricted to a Merced River site. Moreover, rarity of the taxa discouraged further study. Rediscovery of the four Yosemite populations of E. nubigenum (Botti 1982a), and of additional low elevation populations and a montane population of E. congdonii (Botti 1982b) made study of the latter taxon feasible. The Yosemite populations of E . nubigenum , however, were so small that no seeds were collected. Dean Taylor's discovery of a large population outside the Park made an experimental study of the relationship between the taxa feasible. In this paper I describe the results of that study. Materials and Methods The USD A Forest Service and the USDI Park Service permitted me to collect achenes. The E. congdonii achenes came from two sites near El Portal (elev 550 m) and from Trumbull Peak (1 524 m), the E. nubigenum achenes from Pilot Peak (1828 m), about 1 1 km from Trumbull Peak (Fig. 1). The two El Portal progenies each came from several plants, and each of the seven Trumbull Peak ones came from a different plant. The 13 E. nubigenum progenies came from different plants. All achenes (7-14) in each head were sown. Most were stiff and black and were assumed to have an embryo. Such achenes are referred to below as fair to good, and apparently viable. In the later generations only apparently viable achenes" @default.
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• W2510016979 title "A biosystematic study of Eriophyllum congdonii and E. nubigenum (Compositae, Helenidae)" @default.
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