Plants — 23,046 Species

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Arum italicum Mill.
Araceae

Arum italicum Mill.

Arum italicum Mill.

Arum italicum Mill. is a poisonous ornamental aroid with variable subspecies native across Europe, North Africa, and West Asia.

Arum maculatum L.
Araceae

Arum maculatum L.

Arum maculatum L.

Arum maculatum L., also called cuckoo pint, is a poisonous woodland monocot that traps insects for pollination.

Arum orientale M.Bieb.
Araceae

Arum orientale M.Bieb.

Arum orientale M.Bieb.

Arum orientale M.Bieb. is a poisonous aroid with insect-trapping flowers that grows in moist partially shaded woodlands.

Aruncus dioicus (Walter) Fernald
Rosaceae

Aruncus dioicus (Walter) Fernald

Aruncus dioicus (Walter) Fernald

Aruncus dioicus is a tall ornamental flowering plant with edible young shoots and documented medicinal and cytotoxic properties.

Arundina graminifolia (D.Don) Hochr.
Orchidaceae

Arundina graminifolia (D.Don) Hochr.

Arundina graminifolia (D.Don) Hochr.

Arundina graminifolia is a terrestrial perennial orchid with distinct growth, flower traits, and varying status across regions.

Arundinaria gigantea (Walter) Muhl.
Poaceae

Arundinaria gigantea (Walter) Muhl.

Arundinaria gigantea (Walter) Muhl.

Arundinaria gigantea (giant river cane) is a native North American fire-dependent bamboo with great ecological and cultural value, now greatly reduced in range.

Arundinaria tecta (Walter) Muhl.
Poaceae

Arundinaria tecta (Walter) Muhl.

Arundinaria tecta (Walter) Muhl.

Arundinaria tecta is a low bamboo native to the southeastern US that forms the critically endangered canebrake ecosystem.

Arundo donax L.
Poaceae

Arundo donax L.

Arundo donax L.

Arundo donax L. (giant reed) is a large perennial grass with description, ecology, cultivation and uses detailed here.

Asarum canadense L.
Aristolochiaceae

Asarum canadense L.

Asarum canadense L.

Asarum canadense, or Canada wild ginger, is a herbaceous perennial native to eastern North American deciduous forests, used historically by Native Americans.

Asarum caudatum Lindl.
Aristolochiaceae

Asarum caudatum Lindl.

Asarum caudatum Lindl.

Asarum caudatum is a North American forest understory herb that spreads via rhizomes, has ginger-scented leaves, and holds potential medicinal uses.

Asarum europaeum L.
Aristolochiaceae

Asarum europaeum L.

Asarum europaeum L.

Asarum europaeum L. is a shade-tolerative European groundcover plant with shiny pepper-scented leaves and dark-centered purple flowers.

Asarum hartwegii S.Watson
Aristolochiaceae

Asarum hartwegii S.Watson

Asarum hartwegii S.Watson

Asarum hartwegii, or Hartweg's wild ginger, is a perennial herb endemic to California's forest habitats.

Asclepias albicans S.Watson
Apocynaceae

Asclepias albicans S.Watson

Asclepias albicans S.Watson

Asclepias albicans (whitestem milkweed) is a desert milkweed that acts as a larval host for monarch and queen butterflies.

Asclepias amplexicaulis Sm.
Apocynaceae

Asclepias amplexicaulis Sm.

Asclepias amplexicaulis Sm.

Asclepias amplexicaulis is a toxic North American milkweed that flowers spring to summer and tolerates repeated burns.

Asclepias angustifolia Schweig.
Apocynaceae

Asclepias angustifolia Schweig.

Asclepias angustifolia Schweig.

Asclepias angustifolia, or Arizona milkweed, is a rare Arizona perennial that serves as a critical host plant for Monarch butterflies.

Asclepias asperula (Decne.) Woodson
Apocynaceae

Asclepias asperula (Decne.) Woodson

Asclepias asperula (Decne.) Woodson

Asclepias asperula, commonly antelope horns milkweed, is a toxic perennial that is a key host for monarch caterpillars.

Asclepias californica Greene
Apocynaceae

Asclepias californica Greene

Asclepias californica Greene

Asclepias californica is a California-native perennial milkweed, a key monarch host that supports regional pollinator health.

Asclepias cinerea Walter
Apocynaceae

Asclepias cinerea Walter

Asclepias cinerea Walter

Asclepias cinerea Walter is a perennial milkweed herb native to the US Southeast Coastal Plain that hosts monarch and queen butterflies.

Asclepias cordifolia (Benth.) Jeps.
Apocynaceae

Asclepias cordifolia (Benth.) Jeps.

Asclepias cordifolia (Benth.) Jeps.

Asclepias cordifolia, or heart-leaf milkweed, is a perennial native milkweed with historical uses by Native Californian groups and ecological value for monarch butterflies.

Asclepias cryptoceras S.Watson
Apocynaceae

Asclepias cryptoceras S.Watson

Asclepias cryptoceras S.Watson

Asclepias cryptoceras, a North American Great Basin milkweed, was used medicinally by the Northern Paiute people.

Asclepias curassavica L.
Apocynaceae

Asclepias curassavica L.

Asclepias curassavica L.

Asclepias curassavica, tropical milkweed, is a milkweed species cultivated for butterflies that disrupts nonnative monarch migrations.

Asclepias curtissii A.Gray
Apocynaceae

Asclepias curtissii A.Gray

Asclepias curtissii A.Gray

Asclepias curtissii, or Curtiss's milkweed, is a toxic Florida deciduous milkweed with bright white summer flowers, tolerant of soil disturbance.

Asclepias eriocarpa Benth.
Apocynaceae

Asclepias eriocarpa Benth.

Asclepias eriocarpa Benth.

Asclepias eriocarpa is a toxic perennial milkweed native to western North America that supports monarch butterflies.

Asclepias erosa Torr.
Apocynaceae

Asclepias erosa Torr.

Asclepias erosa Torr.

Asclepias erosa is a perennial milkweed herb, historically used for chewing gum and tested for natural rubber in 1935.

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