the type specimen, are relatively small and slender, with all the main divisions of the leaf parted into narrow (1.5-2.5 mm wide) segments. American material
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reduced or not, deeply, palmately (3–) 5–7 (–9) -lobed, smaller, ultimate divisions linear, margins entire. Inflorescences erect to ascending, open or dense
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into 2–3 lanceolate to triangular, often entire-margined, spine-tipped divisions, main spines (yellowish), 2–12+ mm, abaxial densely gray-tomentose, adaxial
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complex is based solely on differences in the number of leaflets, their division, size, and shape, all other aspects of these plants (e.g., rhizomes, flowers
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infraspecific taxa include duration, habit, plant height, indumentum density, division of basal and cauline leaves, leaf shape, and fruit size. Indeed, the species
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annual species in their remarkable flowers. The flower color, the fine divisions of the tips of the tepals, plus the handsome habit make them of potential
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A Text property defining a single value. Structure: division Character: width A size property None. None.
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fields: Dimensional measurement from, Dimensional measurement to Structure: division Character: some_measurement A size property None. None.
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A Text property defining a single value. Structure: division It is a ultimate It is a property of structure constraint: ultimate Character: arrangemen
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essentially unlobed leaves, and from subsp. laciniata by its lesser degree of division of the leaf lobes. It is far less frequent than formerly, having been extirpated
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correlation between morphology, cytology, geography, and ecology to support the division of this complex into meaningful taxa. A complex cytological picture was
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and petal lengths, density of indumentum, development of auricles, and division of basal leaves. This variation, which is continuous, has been the basis
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(for example, B. Ertter 1993; N. H. Holmgren 1997b); they differ in leaf division, vestiture, and epicalyx bractlets. J. Soják considered var. ovium to be
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have been named based upon such features as pubescence, extent of leaf division, and spininess. Although extreme variants can be strikingly different,
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length and orientation of fruit and fruiting pedicel, style length, and the division of cauline leaves. Several varieties have been recognized, and they represent
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origin for North American Astereae (Asteraceae) and reflect deep geographic divisions in Aster s.l. Amer. J. Bot. 86: 398–412. Noyes, R. D. 2000. Biogeographical
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discussion) are mesophytic forms with relatively long and/or broad leaf divisions, corollas varying from white to pale yellow, and pappi and phyllaries like
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with fine, non-septate trichomes; septate trichomes usually absent; leaf divisions various > 4 4 Principal marginal leaf spines 3–10 mm; New Mexico, northeastern
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of the ubiquitous unicellular, stellate trichomes refers to the primary divisions immediately proximal to the center of the trichome. These primary rays
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northern Mexico to Peru. Similarities in overall growth form and the lack of divisions on the lateral wings of the mature perianth led to the long inclusion of
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