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Hardiness & climate
Cold-hardy (zone 4a or colder)
Taxa whose minimum survivable temperature is −30 °F or lower — suitable for hardiness zone 4a and colder. The Upper Plains, northern New England, the Mountain West interior.
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- max_temperature_f=-30
Showing 501–550 of 856.
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Muhlenbergia schreberi J.F. Gmel. MUSCnimblewill · Poaceae -
Muhlenbergia uniflora (Muhl.) Fernald MUUNbog muhly · Poaceae -
Myosotis scorpioides L. MYSCtrue forget-me-not · Boraginaceae -
Myrica gale L. MYGAsweetgale · Myricaceae -
Najas guadalupensis (Spreng.) Magnus NAGUsouthern waternymph · Najadaceae -
Nassella viridula (Trin.) Barkworth NAVI4green needlegrass · Poaceae -
Nelumbo lutea Willd. NELUAmerican lotus · Nelumbonaceae -
Nuphar lutea (L.) Sm. ssp. polysepala (Engelm.) E.O. Beal NULUPRocky Mountain pond-lily · Nymphaeaceae -
Oenothera flava (A. Nelson) Garrett OEFLyellow evening primrose · Onagraceae -
Oenothera fruticosa L. OEFRnarrowleaf evening primrose · Onagraceae -
Oenothera pallida Lindl. OEPApale evening primrose · Onagraceae -
Oligoneuron rigidum (L.) Small var. rigidum OLRIRstiff goldenrod · Asteraceae -
Onobrychis viciifolia Scop. ONVIsainfoin · Fabaceae -
Osmorhiza depauperata Phil. OSDEbluntseed sweetroot · Apiaceae -
Osmorhiza occidentalis (Nutt. ex Torr. & A. Gray) Torr. OSOCwestern sweetroot · Apiaceae -
Osmunda cinnamomea L. OSCIcinnamon fern · Osmundaceae -
Osmunda claytoniana L. OSCL2interrupted fern · Osmundaceae -
Osmunda regalis L. OSREroyal fern · Osmundaceae - Osmunda regalis L. var. spectabilis (Willd.) A. Gray OSRESroyal fern · Osmundaceae
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Ostrya virginiana (Mill.) K. Koch OSVIhophornbeam · Betulaceae -
Oxyria digyna (L.) Hill OXDI3alpine mountainsorrel · Polygonaceae -
Oxytropis lambertii Pursh OXLA3purple locoweed · Fabaceae -
Oxytropis splendens Douglas ex Hook. OXSPshowy locoweed · Fabaceae -
Packera aurea (L.) Á. Löve & D. Löve PAAU3golden ragwort · Asteraceae -
Packera cana (Hook.) W.A. Weber & Á. Löve PACA15woolly groundsel · Asteraceae -
Panicum dichotomiflorum Michx. PADIfall panicgrass · Poaceae -
Panicum rigidulum Bosc ex Nees PARI4redtop panicgrass · Poaceae -
Panicum virgatum L. PAVI2switchgrass · Poaceae -
Papaver gorodkovii Tolm. & V.V. Petrovsky PAGO4arctic poppy · Papaveraceae -
Parnassia palustris L. PAPA8marsh grass of Parnassus · Saxifragaceae -
Pascopyrum smithii (Rydb.) Á. Löve PASMwestern wheatgrass · Poaceae -
Pedicularis canadensis L. PECACanadian lousewort · Scrophulariaceae -
Pedicularis groenlandica Retz. PEGR2elephanthead lousewort · Scrophulariaceae -
Pennisetum glaucum (L.) R. Br. PEGL2pearl millet · Poaceae -
Penstemon acuminatus Douglas ex Lindl. PEACsharpleaf penstemon · Scrophulariaceae -
Penstemon deustus Douglas ex Lindl. PEDE4scabland penstemon · Scrophulariaceae -
Penstemon digitalis Nutt. ex Sims PEDIfoxglove beardtongue · Scrophulariaceae -
Penstemon eatonii A. Gray PEEAfirecracker penstemon · Scrophulariaceae -
Penstemon glaber Pursh PEGL3sawsepal penstemon · Scrophulariaceae -
Penstemon rydbergii A. Nelson PERYRydberg's penstemon · Scrophulariaceae - Penstemon speciosus Douglas ex Lindl. PESProyal penstemon · Scrophulariaceae
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Penstemon strictus Benth. PEST2Rocky Mountain penstemon · Scrophulariaceae -
Penstemon whippleanus A. Gray PEWHWhipple's penstemon · Scrophulariaceae -
Penstemon wilcoxii Rydb. PEWIWilcox's penstemon · Scrophulariaceae -
Perideridia parishii (J.M. Coult. & Rose) A. Nelson & J.F. Macbr. PEPA21Parish's yampah · Apiaceae -
Petasites frigidus (L.) Fr. var. sagittatus (Banks ex Pursh) Cherniawsky PEFRS5arrowleaf sweet coltsfoot · Asteraceae -
Phacelia hastata Douglas ex Lehm. PHHAsilverleaf phacelia · Hydrophyllaceae -
Phalaris arundinacea L. PHAR3reed canarygrass · Poaceae -
Phleum alpinum L. PHAL2alpine timothy · Poaceae -
Phleum pratense L. PHPR3timothy · Poaceae