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Published In: Phytologia 49(1): 47. 1981. (24 Aug 1981) (Phytologia) Name publication detailView 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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3. Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve (roundleaf groundsel, squaw weed)

Senecio obovatus Muhl. ex Willd.

S. obovatus var. umbratilis Greenm.

Pl. 298 g, h; Map 1253

Plants perennial, from a short, relatively slender, erect to horizontal rootstock, often branched and producing well-developed, slender stolons. Stems mostly 1, occasionally 2 or 3, 20–70 cm long, often pubescent with dense, felty hairs in the axils of the basal leaves, the portion above the base thinly pubescent to glabrous, but sometimes with cobwebby patches of dense hairs in the leaf axils. Basal leaves usually present at flowering, long-petiolate, the petioles glabrous or sparsely hairy above the woolly or cobwebby base, the blades 1–8(–14) cm long, unlobed or less commonly with few to several narrow, irregular lobes toward the base, narrowly obovate to oblanceolate, oblong-ovate, or nearly circular, tapered to truncate or slightly cordate at the base, the tissue extending along most of the petiole as a pair of narrow wings, usually rounded at the tip, the margins scalloped or more commonly with blunt to sharp, sometimes irregular teeth, the undersurface usually glabrous, sometimes sparsely hairy, the upper surface glabrous. Stem leaves gradually reduced toward the stem tip, sessile or nearly so, the blades mostly shallowly to deeply pinnately lobed, sometimes irregularly so, the margins otherwise relatively sharply toothed, the surfaces glabrous except sometimes the lowermost leaves with patches of dense, cobwebby hairs at the very base. Involucre 4–7 mm long, glabrous or somewhat cobwebby-hairy near the base. Ray florets usually 7–13, the lobe 5–10 mm long. Fruits 2.5–3.0 mm long, glabrous or hairy along the ribs. 2n=44. April–June.

Scattered nearly throughout the state, but apparently absent from the Mississippi Lowlands Division and portions of the Glaciated Plains (eastern U.S. west to Illinois, Kansas, and Texas; Canada). Bottomland forests, mesic upland forests, banks of streams, ledges of bluffs, and rarely moist depressions of glades and upland prairies; also roadsides and open, disturbed areas.

 


 

 
 
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