• Chasmanthium latifolium - River Oats


    "Inland sea oats is a rhizomatous clump forming perennial with characteristic drooping panicles. The plant can reach four feet in height, but is most often shorter. The leaf blades are broadly lanceolate (up to one inch wide at base) giving it the common name broad-leafed Chasmanthium. Seed heads are borne in open panicles up to 10 inches long. The drooping panicles are initially green turning straw colored as seed ripen. Various shades of red sometimes occur as the fruiting spikelets mature." (Neill, USDA)

    Chasmanthium Latifolium Botany By Dr. John Hilty


    "The preference is partial sun, moist conditions, and a loamy or rocky soil. Plants tend to be smaller in areas that are drier and less fertile." (Hilty) 

    Faunal Associations: 

    "The flowers attract few insects because they are wind-pollinated. The caterpillars of the butterfly Enodia anthedon (Northern Pearly Eye) feed on the foliage of Inland Oats, as do the caterpillars of several Amblyscirtes spp. (Roadside Skippers), including Amblyscirtes vialis (Common Roadside Skipper), Amblyscirtes linda (Linda's Roadside Skipper), and Amblyscirtes belli (Bell's Roadside Skipper); see Bouseman & Sternburg (2001) and Bouseman et al. (2006). The latter two skippers are restricted to southern Illinois and neighboring areas, where their preferred food plant, Inland Oats, is more common. The larvae of a moth, Elachista brachyelytrifoliella mine the leaves of Inland Oats and other woodland grasses (Microleps website)." (Hilty)

    Type: Ornamental grass
    Family: Poaceae
    Native Range: Eastern United States, northern Mexico
    Zone: 3 to 8
    Height: 2.00 to 5.00 feet
    Spread: 1.00 to 2.50 feet
    Bloom Time: August to September
    Bloom Description: Green
    Sun: Full sun to part shade
    Water: Medium to wet
    Maintenance: Low
    Suggested Use: Naturalize
    Flower: Showy, Good Cut, Good Dried
    Leaf: Good Fall
    Other: Winter Interest
    Tolerate: Black Walnut

    1. "Chasmanthium latifolium Boyle Park" By Eric in SF - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15705972
    2. "Chasmanthium latifolium - Indian woodoats" by Matt Lavin is licensed under CC BY-SA 2.0
    3. "Chasmanthium latifolium - Indian woodoats" by Matt Lavin is licensed under CC BY 2.0
    4. "Chasmanthium latifolium, northern sea oats" By Bcbaker2390 - Own work, CC BY-SA 3.0

    • Botany
      • John Hilty Botany, Cultivation, Faunal Associations: John Hilty, "Inland Oats", Illinois Wildflowers, the publisher, Copyright 2004-2019. Accessed 29 January 2022
      • USDA NRCS Botany: Richard H. Neill USDA-NRCS Plant Materials Center, Galliano Louisiana Date: 23 Feb, 2007 

    Information and images compiled by Erik N.Vegeto

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