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genus of herbs and shrubs of Australia and South Africa: everlasting flower; most species usually placed in genus Helipterum Acroclinium , genus Acroclinium
one species: succulent shrub or tree of tropical Africa and Arabia Adenium , genus Adenium
one species: climbing fumitory Adlumia , genus Adlumia
species of Gram-negative aerobic bacteria that produce gas and acid from sugars and are sometimes involved in the souring of milk Aerobacter aerogenes
mushroom species agaric , champignon , chanterelle , morel
type genus of Agaricaceae; gill fungi having brown spores and including several edible species Agaricus , genus Agaricus
genus with one species that is a rapidly growing climbing vine with tuberous roots; grown in hot climates Agdestis , genus Agdestis
largest known toad species; native to Central America; valuable destroyer of insect pests agua , agua toad , Bufo marinus
one species: waterwheel plant Aldrovanda , genus Aldrovanda
one of four subclasses or superorders of Monocotyledones; comprises about 500 species in 14 families of aquatic and semiaquatic herbs Alismatidae , subclass Alismatidae
large species having three ridges on its back; found in southeastern United States alligator snapper , alligator snapping turtle , Macroclemys temmincki
antibody that occurs naturally against foreign tissues from a person of the same species alloantibody , isoantibody
tissue or organ transplanted from a donor of the same species but different genetic makeup; recipient's immune system must be suppressed to prevent rejection of the graft allograft , homograft
annual or perennial grasses including decorative and meadow species as well as notorious agricultural weeds Alopecurus , genus Alopecurus
small reddish slave-making ant species Amazon ant , Polyergus rufescens
plant having basal grasslike leaves and a narrow open cluster of starlike yellowish-orange flowers atop a leafless stalk; southwestern United States; only species of Anthericum growing in North America amber lily , Anthericum torreyi
one species: fly poison; sometimes placed in family Melanthiaceae Amianthum , genus Amianthum
annual of the western United States having large coiled flower spikes; a threatened species Amsinckia grandiflora , large-flowered fiddleneck
2 species of tropical American shrubs or trees Anadenanthera , genus Anadenanthera
one species: rose of Jericho; resurrection plant Anastatica , genus Anastatica
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