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

 

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13b. var. pectinacea

Spikelets appressed to the inflorescence branches or nearly so. 2n=60. July–October.

Common nearly throughout the state (U.S., Mexico, Central America, Caribbean Islands). Banks of streams and rivers, margins of ponds and lakes, edges of bottomland forests, and less commonly upland prairies and glades, often in sandy soil; also fallow fields, old fields, levees, ditches, roadsides, railroads, and open, disturbed areas.

A single, recent collection from a highly disturbed site in the Sikeston area (Scott County) is atypical in its growth form and size in that the plants have more stems that are stouter and somewhat longer than those of other materials from Missouri. This collection is unusual both in its robustness and that it might be confused as a perennial because of the stoutness of the stem bases (however, the plants lack evidence of previous years’ growth or hardened bases). It matches materials from Louisiana and Texas that were originally determined as E. diffusa Buckley, which Koch (1974) treated as a synonym of E. pectinacea. The location of the population in a highly disturbed habitat within an urban area suggests that it may represent plants introduced from seeds originating farther south in the distribution of the species. It may be that these plants should be recognized as a separate variety, but more detailed research is necessary to test this idea.

 


 

 
 
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