Chasmanthium sessiliflorum (Poir.) Yates
Family: Poaceae
Chasmanthium sessiliflorum image
Patrick Alexander  

Culms 60-150 cm, (1)2-3.5 mm thick at the nodes, unbranched, leafy for 40% of their height. Sheaths pilose; collars pilose; ligules 0.2-0.3 mm, entire; blades (15)20-50 cm long, 4.5-9.5(15) mm wide, linear-lanceolate, sparsely pilose adaxially. Panicles (9)20-70 cm, contracted or open, erect; branches tightly appressed or ascending to strongly divergent; axils of panicle branchesglabrous or scabridulous at the edges; pedicels 0.3-2.5(5) mm. Spikelets 4-10 mm long, 6-9 mm wide, with 4-7(8) florets, lower 1(2) florets sterile, fertile florets divergent to 80°. Lower glumes 1.2-2.7 mm, 3-5-veined; upper glumes 1.4-2.2 mm, 3-5-veined; calluses glabrous; fertile lemmas 3.5-5.9 mm, usually curved or irregularly contorted, 7-9-veined, keels not winged, apices scabridulous; paleas 2.8-4 mm; anthers (0.8)1.3-1.6 mm, varying in length within a spikelet. Caryopses 2-2.5 mm, exposed at maturity. 2n =24.

Chasmanthium sessiliflorum grows in rich woods, meadows, and swamps, especially on the coastal plain. It grows throughout most of the southeastern United States.

Much like no. 2 [Chasmanthium laxum (L.) H. O. Yates], but the sheaths villous at the summit or throughout; lvs mostly 6-12 mm wide; 2n=24. Moist open woods and streambanks; Fla. to Tex., n. to se. Va., Tenn., and e.c. Mo. (Uniola s.)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Chasmanthium sessiliflorum image
Patrick Alexander  
Chasmanthium sessiliflorum image
Patrick Alexander  
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
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Chasmanthium sessiliflorum image
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Chasmanthium sessiliflorum image
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Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image
Chasmanthium sessiliflorum image