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Published In: Prodromus Systematis Naturalis Regni Vegetabilis 5: 135. 1836. (1-10 Oct 1836) (Prodr.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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1. Conoclinium coelestinum (L.) DC. (mist-flower, blue boneset, wild ageratum)

Eupatorium coelestinum L.

Pl. 267 a–c; Map 1108

Plants perennial, with rhizomes. Stems 1 or few, unbranched or few- to several-branched below the inflorescence, 25–90 cm long, erect or ascending, moderately to densely pubescent with short, curly hairs. Leaves opposite (the nodes well separated), short- to long-petiolate. Leaf blades 1–10 cm long, triangular-ovate to narrowly triangular, broadly angled to truncate at the base, narrowed or tapered to a usually sharply pointed tip, the margins shallowly scalloped or bluntly toothed, both surfaces glabrous or minutely hairy, usually only along the veins, the undersurface also glandular, with mostly 3 main veins. Inflorescences small panicles or stalked clusters at the branch tips, flat-topped or less commonly dome-shaped. Heads with 35–70 disc florets. Involucre 3–5 mm long, the bracts 18–30 (the head often also subtended by 1 or a few other narrower bracts), in usually 2 or 3 somewhat unequal to nearly equal, overlapping series, narrowly elliptic to narrowly lanceolate, tapered to a sharply pointed, often purple tip, all but the outermost noticeably but finely few-nerved or few-ribbed, sparsely to moderately short-hairy and usually also glandular. Receptacle conical. Corollas purple or lavender-blue (rarely white). Pappus of numerous capillary bristles (although sometimes appearing relatively sparse). Fruits 1.6–2.4 mm long, finely 5-ribbed, slightly wedge-shaped in profile (usually slightly and unevenly tapered at the base), glabrous, the ribs smooth or with a few minute, ascending teeth, lighter colored, the body otherwise irregularly glandular and dark brown to black. 2n=20. August–October.

Scattered, mostly south of the Missouri River (eastern U.S. west to Nebraska and Texas; Canada). Bottomland forests, swamps, banks of streams and rivers, margins of ponds and lakes, marshes, and fens; also ditches, gardens, railroads, roadsides, and shaded to open, disturbed areas.

Several independent molecular studies have suggested that Conoclinium forms a natural group with Ageratum and Fleischmannia that is only distantly related to Eupatorium in the strict sense within the tribe Eupatorieae (Schilling et al., 1999; Schmidt and Schilling, 2000; Ito et al., 2000b). See the treatment of Fleischmannia for further discussion. A rare, white-flowered mutant has been called E. coelestinum f. album Alexander.

 


 

 
 
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