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Leaves mostly keeled, spirally appressed, and not in a single plane, per Native Trees of the Southeast, An Identification Guide.
Leaves opposite, scale-like, in pairs (the side pairs keeled, others flat), per Native Trees of the Southeast, An Identification Guide.
Eragrostis ciliaris var. ciliaris
Spikelets 6-12 flowered, 2-4mm long; keels of palea stiffly long-ciliate, per Manual of the Grasses of the United States.
Leaves hairless, grasslike, upper leaf blades folded and keeled, per Forest Plants of the Southeast and Their Wildlife Uses.
Large Purple Fringed Orchid,
Leaves alternate, lanceolate, keeled, to 8" long, sheathing the lower stem, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Small Green Wood Orchid,
Usually 1 major leaf, low but not basal, clasping, keeled, oblanceolate, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Sarracenia minor var. minor
An exterior structure called the keel or ala is dotted with nectar glands, per Orchids, Carnivorous Plants, and Other Wildflowers of the Green Swamp, NCby Jim Fowler.
Annual Sand Bean,
Keel w a distinctly curved, slender beak projected away from the standard, per Phylogenetic Systematics of Strophostyles (Fabaceae) (Riley-Hulting, 2004).
Perennial Sand Bean,
Keel petal with a prominent, erect, thick-based and slightly curved beak, per Phylogenetic Systematics of Strophostyles (Fabaceae) (Riley-Hulting, 2004).
Calystegia sepium +
Here ssp. appalachiana has strongly keeled bracts with overlapping bases, per Bindweeds of Alabama and adjacent states (Spaulding, 2013).