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Whiteleaf Greenbrier,
Smilax glauca
Climbing or scrambling woody vine with thorns, 2-20m long, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
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Cleome,
Tarenaya species 1
Leaflets oblanceolate, entire. Leaves with flattened recurved stipular thorns, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Purple-flowering Raspberry,
Rubacer odoratum
Only Rubus in the Carolinas consistently without thorns & with simple leaves, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Dewberry,
Rubus flagellaris
Thorns usually short, broad-based, and curved, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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McCartney Rose,
Rosa bracteata
Thorns curved and puberulent, flattened, broad-based, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Oneflower Hawthorn,
Crataegus uniflora
Shrubby habit, small leaves and slender thorns, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Oneflower Hawthorn,
Crataegus uniflora
Slender thorns (2-7cm long), per Weakley's Flora (2020).
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Valley Head Hawthorn,
Crataegus ignava
Thorns moderately stout, usually > 2cm long, per Weakley's Flora (2020).
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Dwarf Hawthorn,
Crataegus munda
Small predominantly spatulate leaves; slender geniculate twigs; thorns < 3cm, per Weakley's Flora (2020).
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Eastern Hawthorn,
Crataegus macrosperma
Thorns in series Tenuifoliae are moderately stout, 2-6cm, and often curved, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Entangled Hawthorn,
Crataegus intricata var. intricata
Glabrous, slightly glandular foliage and slender thorns, per Weakley's Flora (2020).
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Forest Hawthorn,
Crataegus iracunda var. iracunda
Note these stout compound thorns.
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Green Hawthorn,
Crataegus viridis
One of our largest hawthorns, frequently reaching treelike proportions, per Weakley's Flora (2020).
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Pear Hawthorn,
Crataegus calpodendron
One of the latest hawthorns in our area to flower, per Weakley's Flora (2020).
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Fleshy Hawthorn,
Crataegus succulenta var. succulenta
Numerous long thorns (5-9cm long), per Weakley's Flora (2020).
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Cockspur Hawthorn,
Crataegus crus-galli var. crus-galli
Moderately stout thorns, 3-6cm on twigs, to 10cm and compound on trunk, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Littlehip Hawthorn,
Crataegus spathulata
Thorns moderately stout, 2-5cm long, often lacking on twigs of mature plants, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Washington Hawthorn,
Crataegus phaenopyrum
Thorns slender to moderately stout, 2-5cm, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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Washington Hawthorn,
Crataegus phaenopyrum
Leaf lobes with numerous teeth; fruit 5-seeded; thorns usually 3-5cm. — Ron Lance
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Parsley Hawthorn,
Crataegus marshallii
Unmistakable when in leaf, being so unlike other native hawthorns, per Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014).
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English Hawthorn,
Crataegus monogyna
Leaf lobes with few teeth; fruit 1-seeded; thorns usually 1-2cm. — Ron Lance
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Honey Locust,
Gleditsia triacanthos
Strong thorns are frequently branched, per Guide to the Wildflowers of SC (Porcher & Rayner, 2001).
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Trifoliate Orange,
Citrus trifoliata
Seems to be made up almost entirely of "thorns" (actually, stipular spines), per Weakley's Flora.
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Trifoliate Orange,
Citrus trifoliata
Long pointed thorns (1-5 cm) and green branches, per Native Shrubs and Woody Vines of the Southeast (Foote & Jones, 1989).