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Published In: Sida 4(3): 274. 1971. (Sida) 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. Brickellia eupatorioides (L.) Shinners (false boneset)

Kuhnia eupatorioides L.

Pl. 264 a–f; Map 1106

Stems 30–80(–120) cm long, densely and finely hairy to nearly glabrous. Leaves alternate, numerous, usually relatively closely spaced and thus sometimes appearing opposite or whorled at some nodes, short-petiolate or sessile. Leaf blades 0.8–10.0 cm long, linear, narrowly elliptic, or narrowly to broadly lanceolate, short-tapered at the base, tapered to a sharply pointed tip, the margins entire or shallowly to rarely coarsely few-toothed, the upper surface somewhat roughened or glabrous, also with scattered glands, the undersurface sparsely to moderately and finely hairy, sometimes only along the veins, also moderately to densely glandular. Inflorescences small panicles or appearing as stalked clusters at the branch tips, or less commonly appearing as a leafy panicle with loosely racemose branches, the heads usually erect or ascending (except in drought-stressed plants). Involucre 7–15 mm long, narrowly cup-shaped. Disc florets 6–35. Corollas 4–6 mm long. Pappus bristles plumose. Fruits 3–5 mm long. 2n=18. July–October.

Scattered nearly throughout the state, but absent from most of the Mississippi Lowlands Division (eastern U.S. west to Montana and Arizona). Upland prairies, sand prairies, loess hill prairies, glades, savannas, openings of mesic to dry upland forests, ledges and tops of bluffs, banks of streams and rivers, and rarely fens; also pastures, old fields, fallow fields, and roadsides.

The plants once widely referred to as Kuhnia eupatorioides and its allies are now widely accepted as a specialized group within Brickellia (Shinners, 1971; King and Robinson, 1987). Shinners (1946c, 1971) and Turner (1989) have slightly different interpretations of the infraspecific classification of this species, but both accept a number of variants within B. eupatorioides. These varieties seem reasonably distinct throughout much of their ranges, but in areas of geographic overlap they tend to intergrade freely. This is the case in much of Missouri, where the ranges of the three varieties treated below overlap, particularly those of var. corymbulosa and var. eupatorioides. Foliage and inflorescence characters generally are too variable to be useful for separating varieties. Although the species itself is quite distinct in the Missouri flora, users will encounter problems in keying out some specimens below the species level.

 

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1 1. Middle and outer series of involucral bracts tapered to conspicuous, hairlike tips, these frequently twisted or contorted, mostly 1/2 or more as long as inner series ... 1C. VAR. TEXANA

Brickellia eupatorioides var. texana
2 1. Middle and outer series of involucral bracts narrowed or tapered to sharply pointed but not hairlike tips, not contorted, mostly 1/2 or less as long as the inner series

3 2. Involucre 9–15 mm; heads with 15–35 disc florets ... 1A. VAR. CORYMBULOSA

Brickellia eupatorioides var. corymbulosa
4 2. Involucre 7–11 mm long; heads with 6–18 disc florets ... 1B. VAR. EUPATOROIDES Brickellia eupatorioides (L.) Shinners var. eupatorioides
 
 


 

 
 
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