intermedia (A. arborea × A. canadensis) – swamp sugarpear N Amelanchier × neglecta (A. bartramiana × A. laevis) – hybrid juneberry N Amelanchier × quinti-martii (A. arborea × A. bartramiana) – Quint-mart's serviceberry N Amelanchier × wiegandii (A. arborea × A. sanguinea) – Wiegand's serviceberry Amerorchis N Amerorchis rotundifolia – small roundleaf orchis, oneleaf orchid Ammannia N Ammannia robusta – scarlet ammannia Endangered Ammophila N Ammophila breviligulata – American beachgrass Amorpha N Amorpha canescens – leadplant, downy indigobush N Amorpha fruticosa – false indigo Amphicarpaea N Amphicarpaea bracteata – American hog-peanut An Anagallis X Anagallis arvensis – scarlet pimpernel Anaphalis N Anaphalis margaritacea – pearly everlasting Anchusa X Anchusa arvensis – small bugloss, annual bugloss, alkanet X Anchusa officinalis – common bugloss Andromeda N Andromeda glaucophylla – bog rosemary, rosemary-leaf marsh andromeda N Andromeda polifolia var. jamesiana – James Bay bog rosemary N Andromeda polifolia var. polifolia – northern bog rosemary, marsh holyrose Andropogon N Andropogon gerardii – big bluestem, turkeyfoot N Andropogon virginicus – broom-sedge Androsace ? Androsace occidentalis – western rock-jasmine N Androsace septentrionalis – pygmy-flower rock-jasmine, northern androsace Anemone N Anemone acutiloba – sharp-lobed hepatica, sharp-lobed liverleaf N Anemone americana – round-lobed hepatica, American liverleaf X Anemone blanda N Anemone canadensis – Canada anemone, roundleaf thimbleweed N Anemone cylindrica – long-fruited anemone, thimbleweed, candle anemone, long-headed anemone N Anemone multifida – cutleaf anemone, cliff anemone, early anemone N Anemone parviflora – northern anemone, small-flowered anemone N Anemone patens – pasqueflower, prairie smoke, prairie crocus, cutleaf anemone N Anemone quinquefolia – wood anemone, snow-drops N Anemone richardsonii – Richardson's anemone, yellow anemone N Anemone virginiana – tall thimbleweed, riverbank anemone Anethum X Anethum graveolens – dill, Indian dill Angelica N Angelica atropurpurea – purplestem angelica, dark-purple alexanders, wild masterwort, great angelica ? Angelica lucida – seabeach angelica, shiny angelica X Angelica sylvestris ? Angelica venenosa – hairy angelica Anoda X Anoda cristata – crested anoda Antennaria N Antennaria howellii subsp. canadensis – Canada pussytoes N Antennaria howellii subsp. howellii – Howell's pussytoes N Antennaria howellii subsp. neodioica – northern pussytoes, common pussytoes N Antennaria howellii subsp. petaloidea – small pussytoes N Antennaria microphylla – littleleaf pussytoes N Antennaria neglecta – field pussytoes N Antennaria oxyphylla N Antennaria parlinii subsp. fallax – largeleaf pussytoes, deceitful pussytoes N Antennaria parlinii subsp. parlinii – Parlin's pussytoes, smooth pussytoes, plainleaf pussytoes N Antennaria parvifolia – small-leaf pussytoes, Rocky Mountain cudweed, Nuttall's pussytoes