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Polypsecadium apolobamba (Brassicaceae), a new species from Bolivia
Volume 18, Page 1
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Innovations in Hibiscus and Kosteletzkya (Malvaceae, Hibisceae)
Volume 18, Page 4
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A new species of Lophiaris (Orchidaceae, Oncidiinae), in the Lophiaris straminea complex
Volume 18, Page 12
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A new species of alkali grass (Puccinellia, Poaceae) from the western North American Arctic
Volume 18, Page 16
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Magnolia vazquezii (Magnoliaceae), una especie nueva del Estado de Guerrero, México
Volume 18, Page 21
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Haematoxylum sousanum (Leguminosae, Caesalpinioideae), una especie nueva del sur de México
Volume 18, Page 25
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A new, diminutive, Mexican milkweed (Asclepias, Apocynaceae s.l.)
Volume 18, Page 43
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Lectotypification and synonymy in Hortia (Rutaceae)
Volume 18, Page 48
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Two new species of Faramea (Rubiaceae, Coussareeae) from eastern Brazil
Volume 18, Page 67
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Two new species of Psidium (Myrtaceae) from Bahia, Brazil
Volume 18, Page 74
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New combinations in the Pleurothallidinae (Orchidaceae) from the Southern Cone Region of South America
Volume 18, Page 78
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Three new creeping Peperomia species (Piperaceae) from Ecuador
Volume 18, Page 80
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New Boraginaceae from Tropical America 6: a new species of Varronia from Bolivia
Volume 18, Page 86
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A new species of Polygala (Polygalaceae) from Brazil
Volume 18, Page 90
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A new species of Castelnavia (Podostemaceae) from Tocantins, Brazil
Volume 18, Page 94
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Nueva especie de Calceolaria (Calceolariaceae) del centro del Perú
Volume 18, Page 101
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Two new species of Cerastium (Caryophyllaceae) from the Equatorial Andes
Volume 18, Page 104
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A new species of Ceratozamia (Cycadales, Zamiaceae) from Veracruz, Mexico
Volume 18, Page 109
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A new species and three generic transfers in the fern genus Notholaena (Pteridaceae)
Volume 18, Page 120
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El incienso de Bolivia: una especie nueva de Clusia (Clusiaceae) de los bosques montanos del norte de La Paz, Bolivia
Volume 18, Page 130
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Micranthes hitchcockiana (Saxifragaceae), a new combination for North America
Volume 18, Page 138
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A new species of Senna (Leguminosae, Caesalpinioideae) from eastern Brazil
Volume 18, Page 140
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New endemic species of Anthurium Araceae from Río Huallaga, Peru
Volume 18, Page 146
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Three new species of Eleocharis (Cyperaceae) from the Andean páramos of Colombia and Ecuador
Volume 18, Page 168
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Piper giordanoi (Piperaceae): a new species from southeastern Brazil
Volume 18, Page 175
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Two new species of Baccharis (Asteraceae, Astereae) from southern Brazil
Volume 18, Page 178
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A new species of Dimeria (Poaceae, Panicoideae, Andropogoneae) from Goa, India
Volume 18, Page 183
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Especie nueva de Croton sección Eluteria (Euphorbiaceae) de Chiapas, México
Volume 18, Page 189
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Rosa carolina (Rosaceae) subspecies and hybrids in eastern and midwestern United States, Canada, and Mexico
Volume 18, Page 192
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Nomenclatural novelties and one new species in Orthosia (Apocynaceae, Asclepiadoideae)
Volume 18, Page 202
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Bouvardia borhidiana (Rubiaceae, Cinchonoideae), una nueva especie de la Sierra Madre del Sur, México
Volume 18, Page 211
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A new species of Parodia (Cactaceae, Notocacteae) from Rio Grande do Sul, Brazil
Volume 18, Page 214
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Three new varieties of Packera paupercula (Asteraceae, Senecioneae) in midwestern and southeastern North America
Volume 18, Page 220
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Setaria carinata (Poaceae, Paniceae): especie nueva de Venezuela
Volume 18, Page 233
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A new species of Lycianthes (Solanaceae) from the Pacific Region of Colombia
Volume 18, Page 237
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A new species of Parathesis (Myrsinaceae) from Colombia
Volume 18, Page 241
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Besleria beltranii (Gesneriaceae), a new species from Peru
Volume 18, Page 244
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Rubiacearum Americanarum Magna Hama Pars XX. New species of Faramea (Coussareae) from Central and South America
Volume 18, Page 251
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A new species of Orinus from Qinghai, China
Volume 18, Page 275
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New or noteworthy Streptanthus (Brassicaceae) for the Flora of North America
Volume 18, Page 279
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Una especie nueva de Habranthus (Amaryllidaceae, Hippeastreae) para la Flora del Valle de Tehuacán-Cuicatlán
Volume 18, Page 283
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A new Juncus Sect. Ozophyllum (Juncaceae) from peninsular Florida, U.S.A
Volume 18, Page 294
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New species, varieties, and combinations in Cuphea (Lythraceae) from Brazil
Volume 18, Page 298
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Ilex guaramacalensis (Aquifoliaceae), a new species from the Ramal de Guaramacal in the Venezuelan Andes
Volume 18, Page 319
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Draba simmonsii (Brassicaceae), a new species of the D. micropetala complex from the Canadian Arctic Archipelago
Volume 18, Page 325
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Plagiothecium shevockii (Plagiotheciaceae), a new species from Taiwan
Volume 18, Page 344
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A new species of Galactia (Fabaceae, Papilionoideae) from central Texas, U.S.A
Volume 18, Page 347
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Prockia oaxacana (Salicaceae), una especie nueva del Estado de Oaxaca, México
Volume 18, Page 351
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Una nueva especie de Marsdenia (Apocynaceae, Asclepiadoideae) de la Región de Chamela Cuixmala del Estado de Jalisco, México
Volume 18, Page 357
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Arthrostylidium berryi (Poaceae, Bambusoideae, Bambuseae, Arthrostylidiinae), a new species from white sand shrublands in Venezuela and Colombia
Volume 18, Page 361
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A new species of Leucheria (Asteraceae, Mutisieae) from Chile
Volume 18, Page 366
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A new rare species of Lobelia (Campanulaceae, Lobelioideae) from Mexican lowland rainforest
Volume 18, Page 378
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A new species of Simira (Rubiaceae, Simireae) from Rio de Janeiro, Brazil
Volume 18, Page 387
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A new shrub species from a dry forest of Puerto Rico, Reynosia vivesiana (Rhamnaceae)
Volume 18, Page 390
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A distrinctive new species of Ouratea (Ochnaceae) from the Jalapão Region, Tocantins, Brazil
Volume 18, Page 397
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A New Threatened Species of Pandanaceae from Northwestern Madagascar, Pandanus sermolliana
Volume 18, Page 421
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A new species of Malaxis (Orchidaceae, Epidendroideae, Malaxideae) from the Venezuelan Andes
Volume 18, Page 425
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New species of Philodendron (Araceae) from Bajo Calima, Colombia
Volume 18, Page 429
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A new species of Hampeella (Musci, Ptychomniaceae) from Queensland, Australia
Volume 18, Page 490
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Ceradenia itatiaiensis, a new species of Polypodiaceae from southeastern Brazil
Volume 18, Page 495
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New combinations for Arceuthobium aureum (Viscaceae) in Mexico and Central America
Volume 18, Page 501
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A new combination in Clinopodium (Lamiaceae) from Mesoamerica and Cuba
Volume 18, Page 508
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Four new species of Peruvian Gentianella (Gentianaceae)
Volume 18, Page 511
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A new species of Nama (Hydrophyllaceae) in Guatemala
Volume 18, Page 517
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Paneroa, a new genus of Eupatorieae (Asteraceae) from Mexico
Volume 18, Page 520
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Nomenclatural notes on Garcinia (Clusiaceae) from Madagascar and the Comoros
Volume 18, Page 524
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Asplenium badinii (Aspleniaceae), a new endemic fern species from Minas Gerais, Brazil
Volume 18, Page 538