Plants — 23,508 Species

Weld

Reseda luteola L.

Reseda luteola, also called weld, is a flowering plant historically used as a source of bright yellow natural dye.

corn mignonette

Reseda phyteuma L.

Reseda phyteuma L. is a flowering annual or perennial plant found across Europe, Western Asia, and North Africa.

bridal veil broom

Retama monosperma (L.) Boiss.

Retama monosperma (bridal broom) is a Mediterranean flowering bush containing toxic alkaloids, host to two moth species' larvae.

Yellow Bridal Broom

Retama sphaerocarpa (L.) Boiss.

Retama sphaerocarpa is a flowering bush in genus Retama, native to the Iberian Peninsula and North Africa.

Buttbush

Retzia capensis Thunb.

Retzia is a monotypic flowering plant genus in Stilbaceae, whose only known species is native to South Africa's Cape Province.

Japanese knotweed

Reynoutria japonica Houtt.

Reynoutria japonica, or Japanese knotweed, is an East Asian plant often invasive elsewhere, with edible young parts used for food.

tuber fleeceflower

Reynoutria multiflora (Thunb.) Moldenke

Reynoutria multiflora is a herbaceous perennial vine, a popular traditional Chinese medicine that can cause hepatitis if overconsumed.

Giant Knotweed

Reynoutria sachalinensis (F.Schmidt) Nakai

Reynoutria sachalinensis, giant/Sakhalin knotweed, is an Asian perennial herb that is invasive and has multiple cultivated uses.

Mangrovevine

Rhabdadenia biflora (Jacq.) Müll.Arg.

taurepo

Rhabdothamnus solandri A.Cunn.

Rhabdothamnus solandri is the only Gesneriaceae native to New Zealand, an endemic shrub currently facing near-certain future extinction.

Mediterranean buckthorn

Rhamnus alaternus L.

Rhamnus alaternus is an evergreen Mediterranean shrub grown as an ornamental garden plant.

common buckthorn

Rhamnus cathartica L.

Rhamnus cathartica, or purging buckthorn, is a deciduous shrub or small tree with known ecological roles, toxicity, and historical medicinal uses.

Mediterranean buckthorn

Rhamnus lycioides L.

Rhamnus lycioides is a hardy, drought-resistant Mediterranean shrub with toxic berries that support local bird populations.

Olive Buckthorn

Rhamnus oleoides L.

Rhamnus oleoides (olive buckthorn) is a Rhamnaceae flowering plant native from the Mediterranean to Iran and the Arabian Peninsula.

Shiny-leaf

Rhamnus prinoides L'Hér.

Rhamnus prinoides is an African shrub with edible fruits widely used for nutrition, medicine, and brewing traditional drinks.

arfaj

Rhanterium epapposum Oliv.

Rhanterium epapposum, arfaj, is a bushy desert forage shrub and the national flower of Kuwait and Saudi Arabia.

Rhaphiolepis bibas (Lour.) Galasso & Banfi

Rhaphiolepis bibas (Lour.) Galasso & Banfi

Rhaphiolepis bibas, the loquat, is an evergreen shrub or small tree native to China, grown commercially for its multiple uses.

Rhaphiolepis deflexa (Hemsl.) B.B.Liu & J.Wen

Rhaphiolepis deflexa (Hemsl.) B.B.Liu & J.Wen

Rhaphiolepis deflexa, or bronze loquat, is a tree native to East and Southeast Asia whose leaves are used as an expectorant in Taiwanese folk medicine.

Indian Hawthorn

Rhaphiolepis indica (L.) Lindl.

Rhaphiolepis indica, or Indian hawthorn, is an ornamental flowering shrub/small tree grown for landscaping and bonsai.

Sexton's Bride

Rhaphiolepis umbellata (Thunb.) Makino

Rhaphiolepis umbellata is an evergreen Rosaceae shrub native to East Asia, used for dye and horticulture with inedible fruit.

Rhubarb

Rheum rhabarbarum L.

Rheum rhabarbarum is a medicinal Polygonaceae species native to North Asia and North China that contributed to culinary rhubarb.

Savannah meadowbeauty

Rhexia alifanus Walter

Rhexia alifanus, savannah meadowbeauty, is a pink-flowered perennial flowering plant native to the southeastern US to Texas.

Maryland meadowbeauty

Rhexia mariana L.

Rhexia mariana is a North American wildflower with distinct symmetrical flowers that grows in sunny, moist acidic wet areas.

Nuttall's Meadowbeauty

Rhexia nuttallii C.W.James

Rhexia nuttallii, Nuttall's meadowbeauty, is a perennial flowering plant native to Georgia and Florida, U.S.