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- Uvularia puberula (2 revisions)
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- Crataegus (sect. Crataegus) ser. Crataegus (2 revisions)
- Selaginella selaginoides (2 revisions)
- Cystopteris (2 revisions)
- Papaver radicatum subsp. polare (2 revisions)
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- Stylomecon (1 revision)
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- Selaginella arenicola subsp. riddellii (1 revision)
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- Claytonia ogilviensis (1 revision)
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- Mentzelia nuda (1 revision)
- Purshia subintegra (1 revision)
- Poaceae subfam. Pharoideae (1 revision)
- Rosaceae tribe Lyonothamneae (1 revision)
- Carex mckittrickensis (1 revision)
- Bromus catharticus var. catharticus (1 revision)
- Lepidium pinnatifidum (1 revision)
- Cotoneaster cochleatus (1 revision)
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- Eriochloa villosa (1 revision)
- Cylindropuntia californica var. californica (1 revision)
- Amaranthus tricolor (1 revision)
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- Pedicularis sudetica subsp. arctoeuropaea (1 revision)
- Isoëtes georgiana (1 revision)
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- Jarava plumosa (1 revision)
- Porophyllum gracile (1 revision)
- Stylophorum diphyllum (1 revision)
- Anemone narcissiflora var. zephyra (1 revision)
- Carex disperma (1 revision)
- Polygala rugelii (1 revision)
- Euphorbia lasiocarpa (1 revision)
- Crataegus (sect. Coccineae) ser. Lacrimatae (1 revision)
- Marsilea oligospora (1 revision)
- Euphrasia wettsteinii (1 revision)
- Cyperus dentatus (1 revision)
- Aeluropus (1 revision)
- Grusonia (1 revision)
- Sample Queries (1 revision)
- Penstemon newberryi var. newberryi (1 revision)
- Bunias orientalis (1 revision)
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- Eriogonum salicornioides (1 revision)
- Philadelphus pubescens (1 revision)
- Rutenbergiaceae Illustrations (1 revision)
- Delphinium sect. Elatopsis (1 revision)
- Pluchea odorata var. succulenta (1 revision)
- Setaria parviflora (1 revision)
- Ericameria ericoides (1 revision)
- Arabidopsis arenosa subsp. arenosa (1 revision)
- Orobanchaceae Illustrations (1 revision)
- Ivesia rhypara var. rhypara (1 revision)
- Leptodontium flexifolium (1 revision)
- Ericameria nauseosa var. texensis (1 revision)
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- Packera millelobata (1 revision)
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- Ludwigia peruviana (1 revision)
- Corydalis caseana subsp. caseana (1 revision)
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- Sedella leiocarpa (1 revision)
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