Plants — 23,508 Species

Rigid Bog-moss

Sphagnum teres (Schimp.) Ångstr. ex C.Hartm.

Sphagnum teres is a medium-sized peat moss widespread across temperate and polar Northern Hemisphere, growing in minerotrophically fed peatlands and fens.

chickenspike

Sphenoclea zeylanica Gaertn.

Sphenoclea zeylanica is a widespread edible flowering plant that is a common, yield-reducing weed of rice paddies.

prairie wedge grass

Sphenopholis obtusata (Michx.) Scribn.

Sphenopholis obtusata (Michx.) Scribn. is a perennial bunchgrass with a dense spikelike inflorescence that darkens when mature.

Grassveld Sweetpea

Sphenostylis angustifolia Sond.

Sphenostylis angustifolia Sond. is a green perennial pre-rain shrublet with pink fragrant flowers native to the Highveld.

Pink Weed

Spigelia anthelmia L.

Spigelia anthelmia is a highly poisonous flowering plant in Loganiaceae, used as a vermifuge against intestinal worms.

woodland pinkroot

Spigelia marilandica (L.) L.

Spigelia marilandica is a North American native perennial herb grown as an ornamental and used for medicinal purposes.

Ravan's Mustache

Spinifex littoreus (Burm.f.) Merr.

Spinifex littoreus is a dioecious Poaceae flowering plant native to Asian and Australian tropical and subtropical areas.

Beach Spinifex

Spinifex sericeus R.Br.

Spinifex sericeus R.Br. is a grass with distinct male and female inflorescences, where mature female seed heads become tumbleweeds.

interrupted clubmoss

Spinulum annotinum (L.) A.Haines

Spinulum annotinum is a widespread common club-moss with documented traditional uses in Finnish medicine and crafts.

white meadowsweet

Spiraea alba Du Roi

Spiraea alba Du Roi, or narrowleaf meadowsweet, is a 3-4 foot shrub that benefits local wildlife and has historical and decorative uses.

Rose Spirea

Spiraea douglasii Hook.

Spiraea douglasii is a North American native woolly shrub that grows in riparian areas and is invasive in parts of Europe.

Japanese Spirea

Spiraea japonica L.fil.

Spiraea japonica is a deciduous perennial shrub native to East Asia, widely used as an ornamental garden plant.

Shinyleaf Meadowsweet

Spiraea lucida Douglas ex Hook.

Spiraea lucida, shiny-leaf meadowsweet, is a rosaceous flowering plant native to northwestern North America, once classified as a variety of Spiraea betulifolia.

Russian Spirea

Spiraea media Schmidt

Bridal-wreath

Spiraea prunifolia Siebold & Zucc.

Bridalwreath spirea (Spiraea prunifolia) is a mid-spring flowering shrub native to East Asia, often grown as a garden plant.

Bridewort

Spiraea salicifolia L.

Spiraea salicifolia is a Rosaceae flowering shrub cultivated for hedges since the 1500s, native to northern Asia and east-central Europe and widely introduced elsewhere.

Mountain Spirea

Spiraea splendens Baumann ex K.Koch

Spiraea splendens is a small North American western mountain rose-family shrub that was used to make a tea-like drink by Native Americans.

Steeplebush

Spiraea tomentosa L.

Spiraea tomentosa, or steeplebush, is a summer-blooming shrub with medicinal uses, hardy in zones 4 to 8.

Threelobe Spirea

Spiraea trilobata L.

Spiraea trilobata is an Asian native flowering Rosaceae species that occasionally naturalizes in the US.

Appalachian ladies’ tresses

Spiranthes arcisepala M.C.Pace

Spiranthes arcisepala, Appalachian ladies' tresses, is a white-flowered orchid native to eastern North America that grows in wet habitats.

austral ladies'-tresses

Spiranthes australis (R.Br.) Lindl.

Spiranthes australis is a widespread terrestrial perennial orchid with spirally arranged flowers, common across Asia and Australia.

Case's ladies' tresses

Spiranthes casei Catling & Cruise

Spiranthes casei Catling & Cruise is a spiral-flowered orchid species found across parts of the northern U.S. and Canada.

nodding ladies' tresses

Spiranthes cernua (L.) Rich.

Spiranthes cernua is an autumn-flowering North American nodding orchid with spirally arranged white flowers, with one commonly cultivated cultivar.

Sphinx ladies’ tresses

Spiranthes incurva (Jenn.) M.C.Pace

Spiranthes incurva, the Sphinx ladies' tresses, is a North American orchid that is an ancient natural hybrid.