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Published In: Erster Beitrag zur Flora Hercynica 2: 287. 1840. (Erst. Beitr. Fl. Hercyn.) Name publication detail
 

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

 

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1. Crepis capillaris (L.) Wallr. (smooth hawksbeard)

Pl. 255 c–e; Map 1062

Plants annual or biennial. Stems 10–40(–90) cm long, erect or ascending, unbranched or few- to less commonly many-branched, not sticky, moderately to densely but inconspicuously pubescent with cobwebby hairs (the minute, yellowish hairs sometimes few-branched), at least toward the base and just below the heads, often also with short, spreading, gland-tipped hairs toward the branch tips. Basal leaves 3–20 cm long, sessile to long-petiolate, the blade unlobed or more commonly irregularly pinnately lobed, the lobes spreading, mostly narrow, bluntly to sharply triangular, the surfaces glabrous or sparsely and inconspicuously pubescent with minute, curled to cobwebby, yellowish hairs. Inflorescences sometimes relatively few-flowered, the heads often appearing in loose clusters at the branch tips. Inner series of involucral bracts 8–16, 5–8 mm long, glabrous on the inner surface, the outer surface glabrous or minutely pubescent with minute, cobwebby hairs, often also with a longitudinal band of short, spreading, gland-tipped hairs, these with somewhat broadened bases, dark green to black, the outer series of bracts much shorter than to about 1/2 as long as the inner series. Receptacle glabrous. Ligulate florets 20–60, the corolla 8–12 mm long. Pappus 3–4 mm long. Fruits all similar or nearly so, 1.5–2.5 mm long, narrowly oblong-elliptic in outline, not beaked, not expanded at the tip, 10(–12)-ribbed, the ribs smooth or minutely roughened or barbed, light brown to yellowish brown. 2n=6. July–October.

Introduced, known thus far only from St. Louis County (native of Europe; introduced sporadically nearly throughout temperate North America). Open, disturbed areas.

Crepis capillaris is superficially similar to C. tectorum but tends to have denser basal rosettes of leaves at flowering time and fewer-headed inflorescences.

 
 


 

 
 
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