Cenchrus longispinus (Hack.) Fernald - Long-spined Sandbur


 

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Cenchrus longispinus - (image 1 of 5)

 

Taxonomy

Family: Poaceae

Habitat

Sandy disturbed areas.

Associates

 

Distribution

ME to FL, west to ND, OR, CA, and TX.

Morphology

Spreading or ascending annual, 20-80 cm, usually branched; sheaths villous-ciliate distally; blades 6-18 cm long and 3-7 mm wide; burs hairy, 8-12 mm long (including spines), with mostly 45-75 retrorsely barbed, slender spines 3.5-7 mm long, the lower spines relatively short and pointed downward; spikelets 2-3(4) per bur, 6-8 mm, exserted at the tip, visible down the middle through the lateral cleft in the bur.

Notes

Fruiting July to September.

Wetland indicator: UPL

The spines of Cenchrus are formed from concrescent branchlets that enclose the spikelets. Relative to many other fruits that attach to animals (epizoochory) that do so with the aid of hooks on the fruit (e.g. cocklebur), sandburs are more sinister is that the spines are sharp and straight and thus embed deeply in the skin.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.

The New York Botanical Garden. Bronx, NY

 


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Michael Hough 2018