pondage
The small water storage behind the weir of a run-of-the-river hydroelectric power plant.
The water in a reservoir.

pondages
plural of pondage

pondwort
A submerged aquatic plant native to Europe and northwestern Asia (Stratiotes aloides).
A plant, horned pondweed, found in fresh to brackish waters, with long, threadlike leaves (Zannichellia palustris).

ponyfoot
A plant of the genus Dichondra

pooid
Any of the grass subfamily Pooideae.

pooids
plural of pooid

poophyte
A plant that grows best in grass-covered meadows.

poophytes
plural of poophyte

poppyhead
The seedhead of a poppy.

poppyheads
plural of poppyhead

poppywort
The herbaceous plant Stylophorum diphyllum.

poppyworts
plural of poppywort

porcelainberry
Ampelopsis glandulosa, a vine native to East Asia but invasive in the Eastern US, which produces blue or purple berries.

porkbush
Synonym of spekboom.

porogam
Any porogamic plant.

porogams
plural of porogam

porokaiwhiria
pigeonwood

poroporo
The plant Solanum aviculare.

porret
A scallion; a leek or small onion.

porrets
plural of porret

porterweed
Any of various plants in the genus Stachytarpheta of the verbena family.

porterweeds
plural of porterweed

portulaca
Any plant in the genus Portulaca
Any of many tropical trailing herbs, of the genus Portulaca, having showy flowers

portulacas
plural of portulaca

posheaf
partially-ordered sheaf

posies
plural of posy

possentrie
possumwood

possumwood
Any of tree of a few species or the wood of such trees:
Any of tree of a few species or the wood of such trees:
Any of tree of a few species or the wood of such trees:

posy
A flower; a small bouquet; a nosegay.
A verse of poetry, especially a motto or an inscription on a ring.

pothos
Any vine of species Epipremnum aureum, widely cultivated as a houseplant, once classified in the genus Pothos.
Any plant in the genus Pothos; a genus of plants consisting of subtropical and tropical, climbing, flowering vines, indigenous to the environs of the Indian Ocean and western Pacific Ocean.

pothoses
plural of pothos

potomato
Synonym of pomato (“potato–tomato hybrid”).

potomatoes
plural of potomato

poui
Any of various trees in the genus Handroanthus.

pouis
plural of poui

pouteria
Any plant of the genus Pouteria.

pouterias
plural of pouteria

prasinophycean
Any green alga of the class Prasinophyceae.

prasinophyceans
plural of prasinophycean

prasinophyte
Any of various flagellate, unicellular green algae of the class Prasinophyceae

prasinophytes
plural of prasinophyte

preflower
A growth in the internode of a plant that develops into a flower

preflowers
plural of preflower

preforcing
Treatment of a plant in preparation to force it to undergo a certain stage of development earlier than normal.

prehaustoria
plural of prehaustorium

prehaustorium
A structure formed between the root of a parasitic plant and its host that develops into a haustorium

preprophase
A phase of plant mitosis before prophase.

preprophases
plural of preprophase

pretracheophyte
Early vascular land plants similar to moss that lived before tracheophytes appeared

pretracheophytes
plural of pretracheophyte

prickerbush
A thornbush

prickwood
A shrub (Euonymus europaeus), the spindle tree.

prickwoods
plural of prickwood

primula
Any plant of the genus Primula; the primroses.

primulas
plural of primula

proangiosperm
An angiosperm in the act of becoming so from some ancestral form.

proangiosperms
plural of proangiosperm

procimequat
A citrus fruit that is a cross between the limequat and the Hong Kong kumquat: (Citrus aurantifolia 'Mexican' x Fortunella japonica) x Fortunella hindsii.

proembryo
A cluster of cells in the ovule of a fertilized flowering plant that has not yet formed into an embryo.
The protonema of mosses.

proembryos
plural of proembryo

progymnosperm
A very early form of plant that produced both wood (like trees) and spores (like ferns).

progymnosperms
plural of progymnosperm

prophyll
The frequently specialised or reduced leaf produced at the first node of a new shoot.

prophylla
plural of prophyllum

prophylls
plural of prophyll

prophyllum
Alternative form of prophyll.

proso
Panicum miliaceum, a grass used as a crop.

protea
Any of many South African flowering plants, of the genus Protea, having colourful cone-shaped flower heads.

prothalli
plural of prothallus

prothallia
plural of prothallium

prothallium
A plant, usually a pteridophyte, in gametophyte stage in the metagenesis cycle.
The young gametophyte of a liverwort or peat moss.

prothallus
A prothallium.

prothalluses
plural of prothallus

protophyll
A primitive leaf in some clubmosses

protophylls
plural of protophyll

protothecan
Any alga of the genus Prototheca.

protothecans
plural of protothecan

protoxylem
The first xylem to form in a plant.

protoxylems
plural of protoxylem

provenzalia
The plant Calla.

proxyle
Synonym of protoxylem.

proxylem
Synonym of protoxylem.

prunelle
A kind of small and very acid French plum, especially when stoned and dried, from Prunus spinosa.

prunelles
plural of prunelle

prymnesiophyte
Any of many unicellular photosynthetic algae of the class Prymnesiophyceae

prymnesiophytes
plural of prymnesiophyte

psammohalophyte
A halophyte that thrives in sandy conditions

psammohalophytes
plural of psammohalophyte

psammophyte
Any plant which thrives in sandy conditions.

psammophytes
plural of psammophyte

psarolite
A silicified stem of tree fern, found in abundance in the Triassic sandstone.

psarolites
plural of psarolite

psephyte
A lake-bottom sediment composed of plant remains.

psephytes
plural of psephyte

pseudanthia
plural of pseudanthium

pseudanthium
An inflorescence that looks and functions as if it were a single flower.

pseudobulbil
A growth from the roots of Acriopsis javanica composed of two internodes and bearing leaves at the apex.

pseudobulbils
plural of pseudobulbil

pseudocarp
An accessory fruit.

pseudocarpium
Synonym of pseudocarp.

pseudocotyledon
Synonym of proembryo (“cluster of cells that has not yet formed into an embryo”).

pseudocotyledons
plural of pseudocotyledon.

pseudoepiphyte
A plant (such as an aroid) whose stems die away at the base, the upper part deriving its nourishment from its own aerial roots.

pseudoepiphytes
plural of pseudoepiphyte

pseudofilament
A line of algae or similar organisms in a shared gelatinous sheath

pseudofilaments
plural of pseudofilament

pseudolichen
A lichen that has no algal layer of its own, but is parasitic on another lichen-thallus.

pseudolichens
plural of pseudolichen

pseudometallophyte
Any plant that can tolerate a high metal content in its environment, but also thrives under normal conditions

pseudometallophytes
plural of pseudometallophyte

pseudopetiole
The petiole of some monocotyledon leaves which is not part of the lower leaf zone.
A petiole-like constriction of the lamina or similar organ (such as a phyllode or phylloclade).
The morphologically distinct proximal section of a petiole to which stipules are attached.

pseudopetioles
plural of pseudopetiole

pseudoplatanus
A false plane tree (Acer pseudoplatanus)

pseudoroot
A fake root word.
A value that appears to be a root of a polynomial equation but that is not actually a root, such as one obtained when factors cancel out in the process of solving the equation.
Any projection or nodule, such as the hypha of a fungus, that has a rootlike appearance without serving as an actual root.

pseudoroots
plural of pseudoroot

pseudospikelet
A synflorescence in bamboos, consisting of multiple spikelet-like structures that develop from buds.

pseudospikelets
plural of pseudospikelet

pseudostem
A false stem made of the rolled bases of leaves.

pseudostems
plural of pseudostem

pseudothalli
plural of pseudothallus

pseudothallus
The axis of a crowded inflorescence as a glomerule or umbel.

pseudoumbel
An inflorescence that resembles an umbel but is not a true umbel.

pseudoumbels
plural of pseudoumbel.