Plants — 23,508 Species

burroweed

Isocoma tenuisecta Greene

Isocoma tenuisecta, also called burroweed, is a toxic North American perennial herb native to the southwestern US and Sonora.

spiny-spored quillwort

Isoetes echinospora Durieu

Isoetes echinospora Durieu, commonly called spiny quillwort, is a lycophyte species native to North America and parts of Europe.

Slender Clubrush

Isolepis cernua (Vahl) Roem. & Schult.

Isolepis cernua is a widespread small flowering sedge native to multiple regions across the world, found in various wet and brackish habitats.

Budding Club-Rush

Isolepis prolifera (Rottb.) R.Br.

Isolepis prolifera is a tufted perennial marsh flowering plant with distinctive proliferating branching spikelets that occurs across multiple world regions.

Bristle-leaf Bulrush

Isolepis setacea (L.) R.Br.

Isolepis setacea is a perennial sedge species native to Eurasia and Africa, growing in moist wet habitats.

Broad-leaved Drumsticks

Isopogon anemonifolius (Salisb.) Knight

Isopogon anemonifolius is an Australian evergreen woody shrub, commonly cultivated for its ornamental flowers and cut flower use.

Narrow-leaf Drumsticks

Isopogon anethifolius (Salisb.) Knight

Isopogon anethifolius is a yellow-flowering Australian shrub that is widely cultivated for garden and cut-flower use.

Isopogon asper R.Br.

Isopogon asper R.Br.

Isopogon asper R.Br. is a pink-flowered shrub that grows in low heath in south-western Western Australia.

Horny Cone-bush

Isopogon ceratophyllus R.Br.

Isopogon ceratophyllus is a prickly Australian shrub, endangered on the IUCN Red List, highly sensitive to Phytophthora dieback.

Pincushion Coneflower

Isopogon dubius (R.Br.) Druce

Isopogon dubius is a Western Australian shrub cultivated in horticulture since the 1800s, bearing pink to reddish pink spherical flower heads.

Rue-leaved Isopyrum

Isopyrum thalictroides L.

Isopyrum thalictroides L. is a flowering plant from the Ranunculaceae family native to Europe.

Blue Star Creeper

Isotoma fluviatilis (R.Br.) F.Muell. ex Benth.

Isotoma fluviatilis is a low mat-forming flowering plant native to southeastern Australia, commonly grown as garden groundcover.

California Dutchman's Pipe

Isotrema californicum (Torr.) H.Huber

Isotrema californicum, formerly Aristolochia californica, is a deciduous vine endemic to northern California that pollinates via deceit.

woolly Dutchman's pipe

Isotrema tomentosum (Sims) H.Huber

Isotrema tomentosum, or woolly Dutchman's-pipe, is a flowering plant native to the southeastern and south-central United States.

Large Whorled Pogonia

Isotria verticillata (Muhl. ex Willd.) Raf.

Isotria verticillata is a terrestrial rhizome-spreading orchid native to forests and bogs of eastern North America.

Virginia sweetspire

Itea virginica L.

Itea virginica L. is a hardy deciduous shrub native to eastern and south-central United States that grows in shaded wet areas.

Sumpweed

Iva annua L.

Iva annua is an annual herb that was historically cultivated for edible seeds by Native Americans, later abandoned as a crop.

Pensacola Marsh Elder

Iva asperifolia Less.

Pensacola marsh elder (Iva asperifolia) is a small wind-pollinated flowering herb in the Asteraceae family found in the US and Mexico.

poverty weed

Iva axillaris Pursh

Iva axillaris is a North American wind-pollinated herb in the Asteraceae family, now also established as a weed in Australia.

marsh elder

Iva frutescens L.

Iva frutescens, high-tide bush, is a coastal North American salt marsh shrub in the Asteraceae family.

San Diego marsh-elder

Iva hayesiana A.Gray

Iva hayesiana A.Gray is a shrubby perennial herb with nearly invisible flowers that grows in mineral-rich waterways.

Dune Marsh-elder

Iva imbricata Walter

Iva imbricata is a salt-tolerant North American coastal shrub used for dune stabilization.

Tāwari

Ixerba brexioides A.Cunn.

Ixerba brexioides (tawari) is a New Zealand endemic tree valued for its distinctive honey and cultural uses.

Yellow Kalossie

Ixia dubia Vent.