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Hairy Wild-petunia,
Ruellia humilis
Calyx lobes hirsute, linear-setaceous, 15-25mm long, less than 2mm wide, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Carolina Wild-petunia,
Ruellia caroliniensis
Calyx lobes usually hirsute, linear-setaceous, 15-22mm long, < 2mm wide, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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American Water-willow,
Justicia americana
Calyx lobes linear to lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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thickleaf water-willow,
Justicia crassifolia
Calyx lobes linear, 1-1.5cm long, per Flora of the southeastern United States (JK Small, 1913).
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Wright's Plantain,
Plantago wrightiana
Bracts 0.5-1x long as calyx [vs. longer bracts of P. aristata 8-30mm long], per Weakley's Flora (2015).
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Virginia Plantain,
Plantago virginica
Each tiny flower greenish-white, w a narrow papery corolla w 4 erect lobes & a calyx w 4 sepals, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Many-seeded Plantain,
Plantago heterophylla
Calyx lobes hyaline margined, equal to or slightly shorter than bracts, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Woodland Buttonweed,
Spermacoce remota
Calyx puberulent or hirtellous to glabrescent. Corolla white, funnelform, per Flora of China.
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Brazilian-clover,
Richardia brasiliensis
Calyx lobes lanceolate or narrowly lanceolate, margins ciliate, apex acute, per Flora of China.
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Partridgeberry,
Mitchella repens
The bases of the 2 calyces are usually fused; calyx 3-4mm long, lobes minute, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Diamond-flower,
Oldenlandia corymbosa
Calyx glabrous, calyx lobes minute and subulate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Southern Bluet,
Houstonia micrantha
Calyx lobes slightly shorter than to slightly longer than the corolla tube, per Weakley's Flora (2015).
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Southern Bluet,
Houstonia micrantha
Capsules of Houstonia spp. are 2-locular, slightly flattened, lower half enclosed by calyx tube, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Summer Bluet,
Houstonia purpurea
Calyx lobes 1-7mm long, per Weakley's Flora (2020).
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Eastern Longleaf Bluet,
Houstonia longifolia var. compacta
The calyx is green with 4 linear-lance-shaped lobes, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Eastern Longleaf Bluet,
Houstonia longifolia var. compacta
Calyx lobes exceed capsule, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Sweet-breath-of-spring,
Lonicera fragrantissima
Flowers paired, subtended by 2 linear bracts; calyx lobes essentially obsolete, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Coral Honeysuckle,
Lonicera sempervirens
Calyx lobes obsolete to 0.3mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Orange-fruited Horse-gentian,
Triosteum aurantiacum var. aurantiacum
Calyx 5-lobed, actinomorphic or essentially so, lobes linear to narrowly lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Tall Bellflower,
Campanulastrum americanum
Calyx lobes linear, spreading to slightly reflexed, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Southern Harebell,
Campanula divaricata
Calyx lobes linear to linear-lanceolate, ascending, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Wahlenbergia,
Wahlenbergia marginata
Calyx tube adnate to ovary, forming hypanthium; corolla & stamens atop ovary, per Flora of China.
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Wahlenbergia,
Wahlenbergia marginata
Calyx 5-lobed, lobes linear, 1.5-3 mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Cardinal Flower,
Lobelia cardinalis var. cardinalis
Calyx lobes linear, 6-22mm long, entire, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Great Blue Lobelia,
Lobelia siphilitica
Calyx lobes 6-12mm long, denticulate & ciliate, base auriculate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Southern Lobelia,
Lobelia amoena
All calyx segments entire, not toothed (ignore leafy bract), per Weakley's Flora (2020).
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Southern Lobelia,
Lobelia amoena
...corolla lacks hair and calyx lobes are often spreading or flexuous, per Keys, distribution, and taxonomic notes for the lobelias of Alabama and adjacent states (Spaulding & Barger, 2016).
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Streamhead Lobelia,
Lobelia batsonii
Inflorescence secund. Calyx glabrous, as are corolla tube interior & throat, per Lobelia batsonii (Campanulaceae), A New Species from the Sandhills of the Carolinas (Pittman & Sorrie, 2020).
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Downy Lobelia,
Lobelia puberula
Calyx lobes lanceolate, rarely linear, 5-10mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Downy Lobelia,
Lobelia puberula
Margins of calyx lobes ciliate; corolla densely pubescent on the outside, per Keys, distribution, and taxonomic notes for the lobelias of Alabama and adjacent states (Spaulding & Barger, 2016).
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Indian-tobacco,
Lobelia inflata
Bracts longer than the pedicels. Calyx lobes linear, 2-7mm long, entire, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Indian-tobacco,
Lobelia inflata
The calyx becomes inflated in fruit, per Newcomb's Wildflower Guide (Newcomb, 1977).
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Nuttall's Lobelia,
Lobelia nuttallii
Calyx lobes linear to lanceolate, 1.5-3mm long, entire, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Florida Lobelia,
Lobelia floridana
Note that the calyx has small auricles and the corolla tube lacks slit-like openings, per Keys, distribution, and taxonomic notes for the lobelias of Alabama and adjacent states (Spaulding & Barger, 2016).
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White Lobelia,
Lobelia paludosa
Calyx segments not auriculate; pedicels lacking bracteoles, per Weakley's Flora (2012).