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Published In: The Genera of North American Plants 1: 126–127. 1818. (14 Jul 1818) (Gen. N. Amer. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 9/1/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced

 

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1. Collomia linearis Nutt.

Pl. 492 b, c; Map 2250

Plants annuals, taprooted. Stem 5–60 cm long, solitary, erect or strongly ascending, sometimes branched at the lower nodes, glabrous to short-hairy toward the base, moderately pubescent with slightly longer, fine, gland-tipped hairs toward the tip. Leaves alternate, sessile. Leaf blades 1–8 cm long, simple, those of the lower leaves linear to lanceolate, those of the upper ones lanceolate to ovate, angled or tapered to a sharply pointed tip, the bases of the larger leaves sometimes somewhat clasping, the margins entire or nearly so, the upper surface glabrous but often somewhat sticky, the undersurface with short, often glandular hairs, mostly along the midvein, the lateral veins obscure. Inflorescences terminal, solitary, headlike clusters surrounded by leaflike bracts. Calyces 5-lobed to above or near the midpoint, 4–7 mm long at flowering, becoming enlarged to 6–9 mm at fruiting, narrowly bell-shaped, the tube uniform in texture (becoming papery at fruiting), the lobes triangular to narrowly triangular, glandular-hairy. Corollas 5-lobed, white to pink, trumpet-shaped (but often appearing more or less tubular), the tube 8–15 mm long, the lobes 1–4 mm long. Stamens with the filaments attached unequally in the tube, the anthers included or 1 or 2 slightly exerted. Style not exserted. Seeds 3, 2.0–2.5 mm long, oblong-ovoid, slightly flattened, with a shallow longitudinal groove along 1 side and usually a minute winglike ridge at each end, the surface brown, smooth to faintly and finely wrinkled, becoming sticky when moistened. 2n=16. May–August.

Introduced, uncommon, known thus far only from historical collections from Marion County (western U.S. east to North Dakota and Nebraska; Canada; introduced farther east). Pastures and open, disturbed areas.

Steyermark (1963) mentioned an occurrence in Christian County without further documentation. No specimens from this county could be located during the present study.

 
 


 

 
 
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