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Pond Cypress,
Taxodium ascendens
Leaves mostly keeled, spirally appressed, and not in a single plane, per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
American Arborvitae,
Thuja occidentalis
Leaves opposite, scale-like, in pairs (the side pairs keeled, others flat), per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
gophertail lovegrass,
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 (Hitchcock & Chase, 1950).
Rescue Grass,
Bromus catharticus var. catharticus
Lemmas compressed & strongly keeled (entire spikelet thus laterally flattened), per Weakley's Flora.
Granite Flatsedge,
Cyperus granitophilus
Leaf blades strongly keeled, sheaths reddish, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Tall Nutrush,
Scleria triglomerata
Leaves hairless, grasslike, upper leaf blades folded and keeled, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
Spreading Sedge,
Carex laxiculmis
Pistillate scales keeled, midribs green, margins hyaline (or reddish-brown), per Flora of North America.
Eastern Turkeybeard,
Xerophyllum asphodeloides
Leaf blades filiform-linear, keeled, rigid, margins serrulate, apex wiry pointed, densely tufted, per Flora of North America.
Large Purple Fringed Orchid,
Platanthera grandiflora
Leaves alternate, lanceolate, keeled, to 8" long, sheathing the lower stem, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
Small Green Wood Orchid,
Platanthera clavellata
Usually 1 major leaf, low but not basal, clasping, keeled, oblanceolate, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
Appalachian Dragonhead Pogonia,
Cleistesiopsis bifaria
The basal 3/4 of the central keel of the lip with 5-7 discontinuous and irregular ridges, per Weakley's Flora (2023).
Lily-leaf Twayblade,
Liparis liliifolia
Leaves 2, basal, keel-like on lower surface, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
Pecan,
Carya illinoinensis
Husk of fruits is about 1mm thick and winged or keeled, per Trees of the Southeastern United States (Duncan & Duncan, 1988).
Common Climbing Buckwheat,
Fallopia scandens
Calyx with a distinctly wavy or tattered margin and wing-keeled in fruit, per Wildflowers of Tennessee (Carman, 2005).
Alligator-weed,
Alternanthera philoxeroides
Bracts not keeled. Peduncles 1-7cm, from the leaf axils or terminal, per Weakley's Flora (2012).
Hooded Pitcherplant,
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, NC (Fowler, 2015).
Allegheny Live-forever,
Hylotelephium telephioides
Petals white or pink-tinged to pinkish, with greenish keel; stamens about half as long as petals, per Flora of North America.
Ashleaf Golden-banner,
Thermopsis fraxinifolia
Standard orbicular or nearly so, shorter than wing and keel petals, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Red Clover,
Trifolium pratense
Petals 1.2-1.8cm long, with the standard longer than wings or keel, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
White Clover,
Trifolium repens
40-80 flowers in a nearly globose head. The standard longer than wings & keel, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Buffalo Clover,
Trifolium reflexum
Standard usually red, decidedly darker than pink-to-white wing & keel petals, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Smooth Tick-trefoil,
Desmodium laevigatum
The two fused petals of the keel enfold ten stamens and a pistil, per Book of Field and Roadside (Eastman, 2003).
Smooth Tick-trefoil,
Desmodium laevigatum
An insect's probing will snap down the keel, jerking the stamens loose, per Book of Field and Roadside (Eastman, 2003).
Downy Trailing Lespedeza,
Lespedeza procumbens
Keel about as long as the wing petals, but both shorter than the standard, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Smooth Trailing Lespedeza,
Lespedeza repens
Petals subequal in length, or keel slightly exceeding wing petals and standard, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Smooth Trailing Lespedeza,
Lespedeza repens
Keel subequal to the wings, or shorter, per Weakley's Flora.
Wand Lespedeza,
Lespedeza violacea
Flowers in dense racemes. Keel petals usually shorter than the wing petals, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Everlasting Pea,
Lathyrus latifolius
A standard (upper petal), 2 wings (lateral petals), & keel (2 lower petals), per Wildflowers of the Southern Mountains (Smith, 1998).
American Groundnut,
Apios americana
The keel strongly curved inward, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Climbing Butterfly-pea,
Centrosema virginianum var. virginianum
The standard 2.5-3.5cm long, spurred near base; wings & keel about 2cm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Butterfly-pea,
Clitoria mariana var. mariana
The standard up to 2" high, the wings & keel much smaller, per Wildflowers of the Southern Mountains (Smith, 1998).
Sandhill Bean,
Phaseolus sinuatus
Flowers ~ 10mm long, the keel spirally coiled and splitting the wing petals, per Wildflowers of the Sandhills Region (Sorrie, 2011).
Wild Bean,
Phaseolus polystachios
Flowers 3/8" long, with the keel petals spirally coiled, per Wildflowers of the Southern Mountains (Smith, 1998).
Annual Sand Bean,
Strophostyles helvola
Keel w a distinctly curved, slender beak projected away from the standard, per Phylogenetic Systematics of Strophostyles (Fabaceae) (Riley-Hulting, 2004).
Annual Sand Bean,
Strophostyles helvola
Flowers of this genus have a keel strongly curved upward forming a beak, per Wildflowers of the Southern Mountains (Smith, 1998).
Perennial Sand Bean,
Strophostyles umbellata
Keel petal with a prominent, erect, thick-based and slightly curved beak, per Phylogenetic Systematics of Strophostyles (Fabaceae) (Riley-Hulting, 2004).
Oriental Bittersweet,
Celastrus orbiculatus
Buds 6-scaled, often projecting at right angles from the twig, bud scales keeled and spine-tipped, per Woody Plants of Kentucky and Tennessee (Jones & Wofford, 2013).
Appalachian Bindweed,
Convolvulus species 2
Here ssp. appalachiana has strongly keeled bracts with overlapping bases, per Key to the Bindweeds (Calystegia/Convolvulus, Convolvulaceae) of Alabama and adjacent states (Spaulding, 2013).