rhizophytes
plural of rhizophyte

rhizoplane
The microenvironment of a root system near the surface.

rhizoplanes
plural of rhizoplane

rhizoremediation
Soil remediation by the use of plant root systems

rhizoremediator
A plant that brings about rhizoremediation

rhizoremediators
plural of rhizoremediator

rhizosphere
The soil region subject to the influence of plant roots and their associated microorganisms.

rhizospheres
plural of rhizosphere

rhizoxin
An antimitotic agent with antitumor activity, isolated from a pathogenic plant fungus (Rhizopus microsporus) which causes rice seedling blight

rhizoxins
plural of rhizoxin

rhodeasapogenin
A steroidal sapogenin found in the leaves of Rohdea japonica.

rhodo
A rhododendron.

rhodophyte
Any red alga (of phylum Rhodophyta).

rhodophytes
plural of rhodophyte

rhodos
plural of rhodo

rhodosperm
Any seaweed with red spores, in the former class Rhodospermeae.

rhodosperms
plural of rhodosperm

rhyniophyte
An extinct early vascular plant, Rhyniopsida.

rhyniophytes
plural of rhyniophyte

rhyniopsid
Any plant of the class †Rhyniopsida.

rhytidome
The dead layers of plant bark (undergoing or having undergone secondary growth) external to that of the last formed periderm http://i.word.com/idictionary/rhytidome.

rhytidomes
plural of rhytidome

ribbongrass
reed canarygrass (Phalaris arundinacea).

ribbonweed
Any of various marine and freshwater flowering plants:
Any of various marine and freshwater flowering plants:
Any of various marine and freshwater flowering plants:
Any of various marine and freshwater flowering plants:
Any of various marine and freshwater flowering plants:

ribbonweeds
plural of ribbonweed

riccardin
Any of a group of macrocyclic phenolic bisbenzyls present in several plants

riccardins
plural of riccardin

ricinosome
A plant organelle associated with programmed cell death

ricinosomes
plural of ricinosome

ridgehand
A striking surface formed by tucking the thumb of the hand into the palm.

ridgehands
plural of ridgehand

ringbird
The reed bunting.

ringbirds
plural of ringbird

ringstem
Any of the flowering species of the genus Anulocaulis.

risel
A support for a climbing vine.

risels
plural of risel

rivercane
The plant Arundinaria gigantea.

rizom
A plume or ear, as of oats or corn.

rizoms
plural of rizom

roadweed
The plant Plantago major, the greater plantain.

roadweeds
plural of roadweed

robinioid
Any legume of the clade Robinioids

robinioids
plural of robinioid

rockbrake
Any fern in the genus Cryptogramma.

rockbrakes
plural of rockbrake

rockhair
A hairlike lichen, Bryoria fremontii, native to North America and Eurasia, used in dyeing.

rockmelon
A type of melon, Cucumis melo var. reticulatus, with sweet orange flesh and a rough skin resembling netting.

rockmelons
plural of rockmelon

rocoa
The pulp covering the seeds of the tropical plant Bixa orellana, from which annatto is prepared.
Obsolete spelling of roucou

rodwood
Any of various plants of the genus Myrcia.

romerillo
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.
Any of several plants found in Latin America, often with foliage resembling rosemary leaves.

romerillos
plural of romerillo

rontal
A type of palm tree, Borassus flabellifer.

rontals
plural of rontal

rooibos
A shrub (Aspalathus linearis) from which a tisane (herbal tea) is made.
The tisane (herbal tea) made from this plant.
Various shrubs of the genus Combretum.

rooibosch
Alternative form of rooibos.

rooigras
A perennial grass, Themeda triandra, that has large red-brown spikelets

rootball
The mass of roots and associated soil that comes up with a plant lifted from the soil or from a container.

rootballs
plural of rootball

roothole
A hole in the ground formed by the growth of plant roots.

rootholes
plural of roothole

rootstalk
Synonym of rhizome.

rootstalks
plural of rootstalk

rootstock
A healthy and vigorous-rooted plant that is used in grafting, most commonly as a sound base to support a scion that bears desirable fruit in orchard culture.
The necessary basis for something to develop.

rootstocks
plural of rootstock

roquette
A herb of the mustard family (Eruca sativa), with pungently flavored leaves often eaten in salads.

roquettes
plural of roquette

rosehead
The head or blossom of a rose.
A many-sided pyramidal head upon a nail.
A nail with that kind of head.
A circular or spherical nozzle or end to something that is perforated to allow the escape of liquid or gas.
A bur or gouge that has a spherical head and curled blades, resembling the curled petals of a rose.
A conical drillbit that has radiating blades.

roseheads
plural of rosehead

roselet
A little rose.

roselets
plural of roselet

roseling
A young or miniature rose.
An herb of the spiderwort family, genus Callisia.

roselings
plural of roseling

rosha
Synonym of palmarosa.

rosinwood
Any plant of the genus Silphium.

rosula
A small rose.
Synonym of rosette (“small round growth”).

rosulae
plural of rosula

rosybells
The perennial plant Streptopus lanceolatus.

rottlera
Any plant of the genus Rottlera.

rottleras
plural of rottlera

roundpole
An unsplit young tree, used as a construction material.

rowannahs
plural of rowannah

rubberweed
Any of several plants in the daisy family Asteraceae.
Any of several plants in the daisy family Asteraceae.

rubberweeds
plural of rubberweed.

rubberwood
The wood of the Pará rubber tree.

rubigo
rust (fungal disease of plants)

rucola
Rocket, arugula (plant Eruca sativa).

rudraksha
The dried seed of a large evergreen broad-leaved tree, Elaeocarpus ganitrus, which is traditionally used as prayer beads in Hinduism.

rudrakshas
plural of rudraksha

rumbud
A grog-blossom.

rumbuds
plural of rumbud

rumex
Any plant of the genus Rumex; a dock or sorrel.

rumexes
plural of rumex

rupturewort
A plant of the genus Herniaria, especially Herniaria glabra, formerly used in the treatment of hernia and for other medicinal purposes.
A West Indian plant (Alternanthera sessilis, syn. Alternanthera polygonoides), somewhat resembling burstwort.

ruptureworts
plural of rupturewort

rushfoil
Any of various plants of the genus Croton.

rushfoils
plural of rushfoil

rushlight
A type of inexpensive candle formed by soaking the dried pith of the rush plant in fat or grease, which emits light for a relatively short period of time.

rushlights
plural of rushlight

russud
The provisions of grain, forage, and other necessaries prepared by the local officers at the campground of a military force or official cortege.

russuds
plural of russud

rustwort
A liverwort of the genus Marsupella.

rustyback
Asplenium ceterach (syn. Ceterach officinarum), a fern with orange-brown trichomes.

rustybacks
plural of rustyback

rusud
Alternative form of russud.

rusuds
plural of rusud

sabaigrass
The Asiatic perennial grass Eulaliopsis binata

sabaigrasses
plural of sabaigrass

sabamiki
The split or hollowed trunk of a bonsai tree, for example to suggest a lightning strike.

sabbatia
A plant of Sabatia, a genus of smooth slender North American herbs (family Gentianaceae) with opposite leaves and showy white or rose-pink cymose flowers.

sabbatias
plural of sabbatia

sabil
Alternative spelling of sebil (“fountain”).

sabils
plural of sabil

sabinol
An acrid oil, obtained from the plant savin (Juniperus sabina), once used in folk medicine and perfumery.

sabinols
plural of sabinol

sabutan
The leaves of the thatch screwpine, Pandanus tectorius, used in making hats.