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Purple Loosestrife,
Lythrum salicaria
Flowers sessile against the flowering stalks, or with very short pedicels, per www.illinoiswildflowers.info.
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Ciliate Meadowbeauty,
Rhexia petiolata
Leaves sessile, less than 1" long, margins lined w short conspicuous hairs, per Atlantic Coastal Plain Wildflowers (Nelson, 2006).
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Wingstem Water-primrose,
Ludwigia decurrens
The edges of the sessile, narrow lanceolate leaves extend down the stem, per Wildflowers of the Southern Mountains (Smith, 1998).
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Mexican Primose-willow,
Ludwigia octovalvis
Flowers solitary in the axils, subsessile or on stalks to about 1cm long, per Aquatic and Wetland Plants of Southeastern United States (Godfrey & Wooten, 1979 & 1981).
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Water-willow,
Ludwigia leptocarpa
Leaves elliptic, pubescent, to 12cm x 3cm, sessile or subsessile, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Water-purslane,
Ludwigia palustris
This species prostrate or floating. Minute flowers sessile in the axils, per Wildflowers of the Southern Mountains (Smith, 1998).
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Great Willowherb,
Chamaenerion angustifolium ssp. circumvagum
Numerous crowded lance-shaped, entire, sessile leaves to 6" long & 1.2" wide, per Wildflowers of Tennessee (Carman, 2005).
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Dwarf Ginseng,
Nanopanax trifolius
A whorl of 3 leaves, each with 3-5 coarsely toothed, sessile leaflets, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Dwarf Ginseng,
Nanopanax trifolius
Three leaves in a whorl on summit of stem, with 3-5 sessile leaflets, per Wildflowers of the Eastern United States (Duncan & Duncan, 1999).
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Shield Marsh-pennywort,
Hydrocotyle verticillata
Inflorescence verticillate, flowers and fruits sessile or subsessile, per Weakley's Flora (2015).
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Black Snakeroot,
Sanicula marilandica
Polygamous umbellet with sessile to subsessile mature fruits and pedicellate staminate flowers, per A synopsis of the genus Sanicula (Apiaceae) in eastern Canada (Pryer & Phillippe, 1989).
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Small's Sanicle,
Sanicula smallii
Fruit sessile or subsessile, uncinate-bristled, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Beaked Sanicle,
Sanicula trifoliata
Polygamous umbellet with sessile mature fruits and pedicellate staminate flowers, per A synopsis of the genus Sanicula (Apiaceae) in eastern Canada (Pryer & Phillippe, 1989).
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Heartleaf Golden-Alexanders,
Zizia aptera
Each umbellet's central flwr staminate & pedicelled, or pistillate & sessile, per Weakley's Flora (2018).
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Mountain Golden-Alexanders,
Zizia trifoliata
Each umbellet's central flwr staminate & pedicelled, or pistillate & sessile, per Weakley's Flora (2018).
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Black Huckleberry,
Gaylussacia baccata
Sepals 0.7-1mm, glabrous, sessile-glandular, per Flora of North America.
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Bear Huckleberry,
Gaylussacia ursina
Sepals 0.5mm, glabrous, sparsely sessile-glandular, per Flora of North America.
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Bear Huckleberry,
Gaylussacia ursina
Leaves with golden, sessile glands on the lower surface only, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Flowering Pyxie-moss,
Pyxidanthera barbulata var. barbulata
Leaves crowded, sessile (can be mistaken for moss!), per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Sandhills Pyxie-moss,
Pyxidanthera barbulata var. brevifolia
Flowers sessile, ~ 1/4" wide; stamens conspicuous, arising between petals, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Lanceleaf Loosestrife,
Steironema lanceolatum
Leaves mostly sessile, often folded along midrib. Flowers somewhat nodding, per Wildflowers of Tennessee (Carman, 2005).
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Carolina Loosestrife,
Lysimachia loomisii
Leaves sessile, linear, tapered to both ends, opposite or in whorls of 3-4, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Pocosin Loosestrife,
Lysimachia asperulifolia
Whorls... of sessile, rounded-based, acuminate leaves on an unbranched stem, per Weakley's Flora.
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Indian-pink,
Spigelia marilandica
Leaves sessile, with leaf tips acute or acuminate & bases usually rounded, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Small-leaved Miterwort,
Mitreola sessilifolia
Leaves ovate to widely elliptic, acute to obtuse, base rounded, sessile..., per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Caribbean Miterwort,
Mitreola petiolata
Leaves 2-8cm long, petiolate or subsessile and tapering to a cuneate base, per Weakley's Flora (2020).
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Rose-pink,
Sabatia angularis
Leaves opposite, spreading to ascending, sessile and often clasping, per Gentians of the Eastern US (Drake, 2011).
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Pinewoods Rose-gentian,
Sabatia gentianoides
A group of 1-5 flowers, sessile or subsessile. Linear bracts exceed corolla, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Cumberland Rose-gentian,
Sabatia capitata
Leaves 1-2" long, lanceolate with acute tips, sessile or somewhat clasping, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Stiff Gentian,
Gentianella quinquefolia
Stem leaves sessile with acute tips & rounded base; basal leaves spatulate, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Purple Savanna Milkweed,
Asclepias rubra
Leaves sessile, lanceolate, cuneate to rounded at base, acuminate at apex, per Weakley's Flora.
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Wavyleaf Milkweed,
Asclepias amplexicaulis
Leaves mucronate, crispate, auriculate-clasping, glaucous, sessile, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Pinewoods Milkweed,
Asclepias humistrata
Leaves blue-green with pink veins, smooth, thick, oval, sessile-clasping, to 4" long, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Stalked Milkweed,
Asclepias pedicellata
Leaves sessile, narrowly lance-shaped to linear, and 1.25-3.5" long, per Atlantic Coastal Plain Wildflowers (Nelson, 2006).
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Swallow-wort,
Pattalias paluster
Leaves sessile, reflexed, persistent, linear, the margins parallel, per Weakley's Flora (2015).
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Compact Dodder,
Cuscuta compacta
Flowers in sessile compact clusters, pedicels absent, per Weakley's Flora (2012).
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Appalachian Phacelia,
Phacelia dubia var. dubia
Cauline leaves short-petiolate to sessile, pinnately divided, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Miami-mist,
Phacelia purshii
Upper leaves sessile, clasping, pinnately lobed; lower stalked, oft compound, per Wildflowers of Tennessee (Carman, 2005).
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Fringed Phacelia,
Phacelia fimbriata
Upper leaves sessile, clasping, pinnately lobed; lower stalked, oft compound, per Wildflowers of Tennessee (Carman, 2005).
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Clasping Heliotrope,
Heliotropium amplexicaule
Stem leaves sessile/sub-sessile, oblong-oblanceolate, sordid, tawny-villous, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Viper's-bugloss,
Echium vulgare
Cauline lvs oblong to linear-lanceolate, sessile, progressively smaller upward, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Bigseed Forget-me-not,
Myosotis macrosperma
Stem leaves sessile, the lower spatulate, the upper elliptic and smaller, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Blue Scorpion-grass,
Myosotis stricta
Basal leaves 1-2cm long, narrowed to a winged petiole; cauline leaves sessile, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Virginia Bluebells,
Mertensia virginica
Basal lvs long-petiolate, upper& middle cauline lvs short-petiolate to sessile, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Purpletop Vervain,
Verbena bonariensis
Leaves narrowly lanceolate to elliptic-lanceolate, sessile with clasping bases, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Purpletop Vervain,
Verbena incompta
Leaves narrowly lanceolate to elliptic-lanceolate, sessile with clasping bases, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Carolina Vervain,
Verbena carnea
Leaves sessile or subsessile, cuneate, not lobed or some lower on stem 3-lobed, per Weakley's Flora.
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Stiff Verbena,
Verbena rigida
Leaves sessile, partially clasping the stem, with flaring coarse teeth, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
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Narrowleaf Blue Curls,
Trichostema setaceum
Leaves short-petioled to sessile, linear and bluntly pointed, to 2" long, smooth, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Carpet Bugle,
Ajuga reptans
Thyrse leafy-bracteate, cymules sessile, 3-5 flowered; bracts reduced upward, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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American Germander,
Teucrium canadense var. canadense
Usually a bracteate thyrse with sessile cymules, each with 3-5 flowers, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Hyssop Skullcap,
Scutellaria integrifolia
Middle & upper leaves are lanceolate & taper to a sessile base, per Wildflowers of the Southern Mountains (Smith, 1998).
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Carolina Birds-in-a-nest,
Macbridea caroliniana
Leaves 6-13cm long, 1.5-4cm wide, lower petiolate, upper sessile.
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Henbit,
Lamium amplexicaule var. amplexicaule
Whorls of flowers subtended by sessile, horizontal leaves, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Henbit,
Lamium amplexicaule var. amplexicaule
Leaves nearly round, upper ones sessile & almost clasping, per Wildflowers of the Southern Mountains (Smith, 1998).
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Narrowleaf Mountain-mint,
Pycnanthemum tenuifolium
Leaves linear, 1-2" long, about 1/8" wide, nearly sessile, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Short-toothed Mountain-mint,
Pycnanthemum muticum var. 1
Leaves short-petioled to sessile, oval to lance-shaped, finely toothed, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Wild-oregano,
Cunila origanoides
A wiry, much-branched plant with sessile ovate leaves, per Wildflowers of the Southern Mountains (Smith, 1998).
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Wild-oregano,
Cunila origanoides
Leaves sessile or short-petioled, oval to lance-shaped, with sparingly toothed margins, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Shaggy Hedge-hyssop,
Sophronanthe pilosa
Leaves are sessile, ovate, with smooth or irregularly toothed margins, per Wildflowers of the Sandhills Region (Sorrie, 2011).