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Hairy Mock-orange,
Philadelphus hirsutus
Stems & calyx hairy, per Woody Plants of the Blue Ridge (Lance).
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Snowy Hydrangea,
Hydrangea radiata
Sterile flowers are 1-3.5cm broad, consisting of a flat 3-4 lobed calyx, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Two-leaved Miterwort,
Mitella diphylla
Calyx tube mostly cup-shaped, the petals small and deeply fringed, per Wildflowers of Tennessee (Carman, 2005).
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Two-leaved Miterwort,
Mitella diphylla
The upright calyx of each flower holds tiny black seeds until jarred out, per Gardening with the Native Plants of Tennessee (Hunter, 2002).
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Mapleleaf Alumroot,
Heuchera villosa
The calyx is covered with long white hairs, per Wildflowers of Tennessee (Carman, 2005).
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Mapleleaf Alumroot,
Heuchera villosa
A cup-shaped white hairy calyx, 5 minute petals, 5 long-extending stamens, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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American Alumroot,
Heuchera americana
Calyx tube turbinate to campanulate; adnate portion of hypanthium longer than free portion, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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American Alumroot,
Heuchera americana
Calyx glandular-puberulent, greenish; stamens and style exserted, per Weakley's Flora.
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Purple Alumroot,
Heuchera hispida
At the onset of anthesis, stamens exserted 3mm+ and styles 2.6mm+ beyond the calyx, per Weakley's Flora (2022).
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Marbled Alumroot,
Heuchera pubescens
Flowers viewed from the side will look mostly green owing to the long (9-10mm) calyx lobes, per Vascular Plants of North Carolina.
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Brook Lettuce,
Micranthes micranthidifolia
Calyx tube absent; sepals 1.5-2.5mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Northern Witch-hazel,
Hamamelis virginiana var. virginiana
Last year's calyx lobes.
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Northern Witch-hazel,
Hamamelis virginiana var. virginiana
Calyx lobes 4, reflexed, adnate to ovary, adaxially yellow-green to yellow, per Flora of North America.
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Ozark Witch-hazel,
Hamamelis vernalis
Calyx lobes 4, reflexed, adnate to ovary, per Flora of North America.
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Ozark Witch-hazel,
Hamamelis vernalis
Calyx often adaxially deep purple, per Flora of North America.
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Indian Strawberry,
Potentilla indica
5 bracts, widened upward with 3(5) teeth, interspersed with 5 calyx lobes, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Dwarf Cinquefoil,
Potentilla canadensis
Calyx lobes 2-5mm long, bracts slightly longer. Petals 7-10mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Old Field Cinquefoil,
Potentilla simplex
Epicalyx bractlets linear to narrowly lanceolate, often larger than sepals, per Flora of North America.
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Purple Flowering-raspberry,
Rubacer odoratum
Peduncles, pedicels and calyx covered with gland-tipped red trichomes, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Pale Avens,
Geum virginianum
Calyx reflexed soon after anthesis, per Weakley's Flora.
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Spring Avens,
Geum vernum
Head of achenes elevated above the calyx on a 1-2mm stipe, per Weakley's Flora (2012).
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Spring Avens,
Geum vernum
The presence of a stalk between the calyx and the achene head is diagnostic, per Wildflowers of the Southern Mountains (Smith, 1998).
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Bowman's Root,
Gillenia trifoliata
A reddish, tubular, 5-lobed calyx that persists after flowers drop, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Oneflower Hawthorn,
Crataegus uniflora
Calyx slightly elevated, lobes lanceolate, foliaceous, glandular-serrate, persistent on fruit, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Oneflower Hawthorn,
Crataegus uniflora
Calyx broad, lobes 4-7mm long, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Allegheny Hawthorn,
Crataegus alleghaniensis
Twigs, young leaves often sparsely hairy; calyx sessile, fruit soft after maturity. — Ron Lance
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Scarlet Hawthorn,
Crataegus coccinea
...in combination w even-toothed calyx lobes & 5-10 stamens, are distinctive, per Weakley's Flora (2020).
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Schuette's Hawthorn,
Crataegus schuettei
20 stamens and glandular-serrate calyx lobes the chief diagnostic features, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Forest Hawthorn,
Crataegus iracunda var. iracunda
Typical C. iracunda has hard red fruit with a sessile calyx, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Biltmore Hawthorn,
Crataegus intricata var. biltmoreana
Leaves villous or sparsely hairy; calyx lobes deeply glandular-serrate, per Weakley's Flora (2020).
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Dotted Hawthorn,
Crataegus punctata
Calyx lobes subentire. Fruits vary in shape and size (12mm-22mm), per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Washington Hawthorn,
Crataegus phaenopyrum
Fruit subglobose, 4-7mm wide, bright red. Calyx collar sessile and open, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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European Medlar,
Crataegus germanica
Calyx lobes foliaceous on fruit, calyx collar open, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Downy Serviceberry,
Amelanchier arborea
Fruit a reddish-purple, nearly round, fleshy pome; calyxes persistent, per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
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Eastern Serviceberry,
Amelanchier canadensis
Position of calyx remnants reveal fruit to be derived from an inferior ovary.
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Mimosa,
Albizia julibrissin
Stamens so prominent that close inspection necessary to see calyx & corolla, per Trees of the Southeastern United States (Duncan & Duncan, 1988).
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Eastern Redbud,
Cercis canadensis var. canadensis
Calyx reddish or roseate, basally oblique, lobes triangularly dentate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Eastern Prairie Blue Wild Indigo,
Baptisia aberrans
Calyx glabrous except for the densely short-ciliate margin, the upper lip barely divided, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Creamy Wild Indigo,
Baptisia bracteata
Calyx upper lip only slightly emarginate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Creamy Wild Indigo,
Baptisia bracteata
Calyx glabrous or spreading short-pubescent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Horsefly Weed,
Baptisia tinctoria
Calyx persistent, campanulate, tube 2-3mm long, upper teeth ca. 0.5mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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a hybrid Wild Indigo,
Baptisia ×serenae
Raceme slender: calyx lobes shorter than tube, per Manual of the Southeastern Flora (JK Small, 1933).
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Narrow-pod White Wild Indigo,
Baptisia albescens
Flowering pedicels 3-10mm long; calyx 4.5-6.5mm long; corolla 13-16(18)mm long, per Weakley's Flora.
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Aaron's Rod,
Thermopsis villosa
Rachis and calyx tawny-tomentose, pedicels strongly ascendent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Appalachian Golden-banner,
Thermopsis mollis
Calyx pubescent, the lobes 2-2.5mm long, per Weakley's Flora.
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Ashleaf Golden-banner,
Thermopsis fraxinifolia
Pedicels as long or longer than the bracts. Calyx glabrous, per Weakley's Flora.
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Low Rattlebox,
Crotalaria maritima
Petals yellow, equaling or longer than the calyx, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Arrowhead Rattlebox,
Crotalaria sagittalis
Calyx loosely pubescent (vs. that of C. purshii strigose), per Manual of the Southeastern Flora (JK Small, 1933).
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Smooth Rattlebox,
Crotalaria pallida var. obovata
Calyx densely pubescent, bracteoles at its base. Corolla ~ 2x long as calyx, per Flora of China.
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Slenderleaf Rattlebox,
Crotalaria ochroleuca
Corolla pale yellow or white, exserted far beyond calyx, per Flora of China.
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Persian Clover,
Trifolium resupinatum
Calyx strongly 2-lipped, calyx tube bladdery and greatly inflated in fruit, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Rabbitfoot Clover,
Trifolium arvense
Long soft hairs of calyxes all but conceal tiny pink or white flowers, per Wildflowers of the Southern Mountains (Smith, 1998).
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Crimson Clover,
Trifolium incarnatum
Calyx densely tawny villous, lobes at first erect but later wide-spreading, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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White Clover,
Trifolium repens
Flowers borne on distinct pedicels. Calyx lobes narrowly triangular, per Weakley's Flora (2015).
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Buffalo Clover,
Trifolium reflexum
Calyx lobes 4mm or more long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Buffalo Clover,
Trifolium reflexum
Calyx lobes subulate [awl-shaped], setaceous [having bristles], < 0.4mm wide, per Weakley's Flora.
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White Sweetclover,
Melilotus albus
Calyx lobes deltoid to subulate, 0.5-1mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Piedmont Indigo-bush,
Amorpha schwerinii
Calyx lobes approach, = or exceed length of calyx tube; racemes 3-8(15)cm long, per Weakley's Flora.
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Mountain Indigo-bush,
Amorpha glabra
Calyx lobes obolete or nearly so or weakly undulate, longest usually < 0.6mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Buckroot,
Pediomelum canescens
Flowers in 1-2" racemes, 4-8 per raceme. The calyx is densely downy, per Wildflowers of the Sandhills Region (Sorrie, 2011).