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Published In: Dictionnaire des Sciences Naturelles, ed. 2, 16: 46. 1820. (Dict. Sci. Nat. (ed. 2)) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
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Project Data     (Last Modified On 8/10/2009)

 

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19. Eurybia (Cass.) S.F. Gray

Plants perennial herbs, usually with elongate, fleshy rhizomes, often forming colonies, the rootstock sometimes somewhat woody in E. hemispherica. Stems usually solitary, erect or ascending, unbranched below the inflorescence, with fine, longitudinal lines, glabrous or hairy. Basal leaves present or absent at flowering. Stem leaves gradually reduced toward the tip, variously shaped, glabrous or hairy. Inflorescences either slender racemes or flat-topped to somewhat dome-shaped panicles or loose clusters, rarely of solitary heads, the heads nearly sessile to long-stalked, the bracts relatively few and more or less leaflike. Heads radiate, not sticky or resinous. Involucre 7–12 mm long, broadly cup-shaped to obconical or slightly bell-shaped. Involucral bracts either in 5–7 unequal or in 2–4 nearly equal, overlapping series, variously shaped, the tip ascending or more or less spreading, with a pale, thickened base, this with or without a slender, green midvein, with an ovate to broadly diamond-shaped green portion toward the tip, this sometimes with narrow purple margins. Receptacle flat or shallowly convex, with minute, irregular ridges around the concave attachment points of the florets. Ray florets 9–35, pistillate, the corolla white or lavender to purple. Disc florets 15–80, perfect, the corolla 5.5–8.0 mm long, relatively shallowly lobed, yellow, turning reddish purple to brownish purple after the pollen has been shed, not persistent at fruiting. Pappus of the ray and disc florets similar (the outermost bristles sometimes appearing slightly shorter), apparently of 1 (but often actually 2) series of numerous (60–80) finely barbed bristles 5–8 mm long, the innermost bristles sometimes slightly broadened toward the tip, light tan to pale orangish brown. Style branches with the sterile tip (beyond the stigmatic lines) (0.2–)0.3–0.5 mm long, linear to lanceolate. Fruits narrowly obconical to oblong-ellipsoid, oblong-obovoid, or nearly cylindrical, sometimes slightly flattened, with 7–16 yellowish brown ribs, glabrous or hairy, brown to greenish brown, rarely tan. About 28 species, U.S., Canada, Europe, Asia.

Eurybia is part of an as-yet poorly understood group of genera that includes the large Aster-segregate Symphyotrichum as well as several genera of western North American plants formerly treated in Aster and/or Haplopappus and currently known as the Machaeranthera Nees alliance (Semple et al., 2002). The generic limits of Eurybia require further study, and it is possible that some of the species presently included in the genus are more closely related to those in other genera (Semple et al., 2002). In Missouri, the three species are all morphologically relatively distinct.

 

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1 1. Basal and lower stem leaves often absent at flowering, when present, sessile or short-petiolate, the blade linear to narrowly oblanceolate, tapered at the base ... 2. E. HEMISPHERICA

Eurybia hemispherica
2 1. Basal and lower leaves present at flowering, long-petiolate, the blade heart-shaped to triangular-ovate, deeply cordate at the base

3 2. Inflorescence branches (and upper portion of stem) sparsely to moderately pubescent with short, nonglandular hairs; ray florets with the corolla white, sometimes turning pinkish- or lavender-tinged with age ... 1. E. FURCATA

Eurybia furcata
4 2. Inflorescence branches (and upper portion of stem) moderately to densely pubescent with short, gland-tipped hairs; ray florets with the corolla lavender to purple ... 3. E. MACROPHYLLA Eurybia macrophylla
 
 
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