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Published In: Catalogue of North American Plants North of Mexico (ed. 2) 21. 1900. (Cat. N. Amer. Pl. (ed. 2)) Name publication detail
 

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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5. Echinochloa walteri (Pursh) A. Heller

Map 658

Flowering stems 60–200 cm long, stout, erect or ascending from often spreading bases. Leaf sheaths (at least the lowermost ones) pubescent with pustular‑based hairs, rarely glabrous. Leaf blades 10–50 cm long, 8–30 mm wide, glabrous or roughened. Inflorescences 10–30 cm long, the primary branches 1–6 cm long, ascending and relatively densely spaced, mostly strongly overlapping along the main axis, all but the uppermost with several short, secondary branches. Spikelets 3–5 mm long (excluding the awns), narrowly ovate to oblong‑ovate in outline, mostly hidden by the mass of awns, usually dark purple at maturity. Upper glume 2.8–4.8 mm long (excluding the awn), ovate, tapered at the tip to an awn 2–12 mm long, usually roughened or hairy, at least along the nerves, the hairs with or without pustular bases. Sterile floret with the palea well developed and 2/3–3/4 as long as the lemma, the lemma 2.8–5.0 mm long (excluding the awn), ovate, tapered at the tip to an awn 10–60 mm long, usually roughened or hairy, at least along the nerves, the hairs with or without pustular bases. Fertile floret with the lemma 3–5 mm long, about 3 times as long as wide, narrowly elliptic, the tip relatively firm, usually wrinkled but not withering at maturity, narrow and sharply pointed, without a line of minute hairs at the base. Anthers 0.4–0.7 mm long. 2n=36. September–October.

Uncommon, known thus far only from St. Charles County (eastern U.S. west to Minnesota and Texas, most commonly along the Atlantic and Gulf Coastal Plains; Canada, Mexico, Central America, Caribbean Islands). Banks of rivers and sloughs.

Although Hitchcock and Chase (1951) included Missouri in the range of this species, it was not confirmed to occur in the state until recently (Smith, 1996). This robust, beautiful species should be found elsewhere in the state in the future, particularly along the Mississippi River floodplain.

 


 

 
 
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