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Published In: A Flora of North America: containing . . . 2(2): 194. 1842. (Fl. N. Amer.) 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: Introduced

 

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1. Gutierrezia texana (DC.) Torr. & A. Gray

Pl. 235 i–k; Map 985

Plants annual, with taproots. Stems solitary, 10–100 cm long, erect or strongly ascending, with numerous ascending to loosely ascending branches from below the midpoint, longitudinally lined or ridged, glabrous. Basal leaves absent. Stem leaves sessile or less commonly short-petiolate, 0.5–5.0 cm long, the blade narrowly linear to linear-lanceolate or linear-oblanceolate, mostly sharply pointed at the tip, more or less tapered to the nonclasping base, the margins entire, the surfaces glabrous but with moderate to dense, impressed resinous dots, often somewhat sticky to the touch. Inflorescences appearing as more or less flat-topped panicles, the heads solitary or in small, loose clusters along the branches and/or at the branch tips, the branch tips and stalks short to relatively long, with few leaflike, linear bracts 0.3–1.0 cm long. Heads radiate, sticky, resinous. Involucre 2–4 mm long, narrowly cup-shaped to obconical. Involucral bracts in 2–4 unequal, overlapping series, oblong-lanceolate to oblong-ovate, with a straw-colored to yellowish, hard, shiny basal portion (this sometimes with a slender, green midvein) and an ascending, triangular or diamond-shaped, green tip, glabrous but the green portion finely resin-dotted. Receptacle flat or slightly convex, minutely hairy around the attachment points of the florets. Ray florets 5–14, pistillate, the corolla 3–6 mm long, yellow, sometimes persistent at fruiting. Disc florets 7–13, perfect, the corolla 1.5–2.5 mm long, yellow. Pappus of the ray and disc florets similar, a minute, light-colored crown or ridge less than 0.2 mm long, rarely a minute, toothed (appearing scalelike) ring, always much shorter than the corolla. Fruits 0.8–1.5 mm long, oblong-obovoid, sometimes slightly flattened, with 6–9 fine, green nerves, the surface otherwise densely pubescent with short, grayish purple hairs, purplish brown to nearly black. 2n=8, 10, 16. (July–)October.

Introduced, known only from a single collection from the city of St. Louis (Oklahoma to Texas and adjacent Arkansas and Louisiana; Mexico; introduced in Illinois and Missouri). Railroads.

This species was reported by Steyermark (1963) in the addendum at the end of his Flora of Missouri, based on a specimen collected by Viktor Mühlenbach in the St. Louis railyards. A second variety (var. glutinosa (S. Schauer) M.A. Lane), with heads having more florets and a better-developed pappus, occurs in eastern Mexico and southern Texas.

 
 
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