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et al. (2007) included the former in the latter. Names are provided for users who would prefer to include Waldsteinia within Geum, as supported by molecular

8a1a. ser. Eleocharis, 8a1d. ser. Tenuissimae, and 8a2. sect. Eleogenus. Users of this treatment should be aware of the following: culms that are smooth

and are often hard to assess (i.e., the sexuality of microscopic florets). Users of the keys will meet with frustrations; descriptions of subgenera and illustrations

similar in flower may often be readily distinguished in fruit and vice versa; users of this text are encouraged to verify identification from the same plant

weediness are marked here on the basis of the status listed under Scripus. Users of this treatment should note the following features: colors of unripe achenes

States. The roots grow to great depths and, because the plants are heavy users of water, they are known to lower dramatically the water table. Russian olive

conservative approach used in this treatment emphasizes external morphology. Users of this account of Pinus should note the following. Leaf measurements given

canvassed by use of several questionnaires designed to identify potential users of the databank, to inventory plant systematists, and to evaluate systematists'

members of genus Hypochaeris and, possibly, of other genera as well. The user is warned that the key may not work for all species within the tribe. window

the other polyploid agamic complexes. Identifying Antennaria specimens. Users of this treatment should be aware that multiple details must be kept in mind

Callihan are given in order to make this information more easily available to users of the Flora of North America North of Mexico. Weediness is indicated by

appears continuous and multidimensional. There seems to be no utility for the users in describing a multitude of narrowly defined microspecies. For the native

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Harrison 1986; J. F. Morton 1975; J. W. Thieret and J. O. Luken 1996). Users of this treatment should be aware of the following: 1) Leaves shrink considerably

have not migrated beyond regions where their parents are sympatric. Thus, users of this treatment should be wary of major range extensions for apomictic

extension services or their regional equivalents. In addition, many regions have "user-friendly" weed manuals that are tailored to the needs of agriculturalists