_Laburnum_—Yellow-flowered trees allied to the Pea family (Leguminosæ).

_Legume_—The dehiscent fruit of the pea family, a pod.

_Leguminosæ_—A family of plants having for their fruit a legume or pod, _i.e._, Pea, Laburnum.

_Lenticels_—Minute pores in the bark.

_Liane_—A hanging root or stem.

_Liber_—The inner bark, same as phloëm.

_Linnæa_—A genus of dwarf trailing plants.

_Luscious_—Sweet and succulent.

M

_Magnesium_—The metallic base of magnesia.

_Magnolia_—A genus of flowering shrubs and trees.

_Mahonia_—A genus of evergreen shrubs belonging to the barberry family.

_Martynia_—A genus of plants having capsules with long curved hooks.

_Melampyrum_—A genus of dwarf flowering plants partly parasitic.

_Membranous_—Thin and destitute of green colour usually applied to bracts.

_Mesocarp_—The central layer of the pericarp.

_Mesophyll_—The ground tissue of the leaf.

_Metabolism_—Changes which take place in protoplasm and which it causes in other substances.

_Microbes_—A term applied to one-celled plant atoms, like bacteria.

_Micropyle_—A small pore in the coats of the ovule through which the pollen tube passes.

_Modicum_—Moderate sized; a small quantity.

_Monocotyledon_—A plant whose seed is furnished with one seed leaf.

_Monœcious_—Applied to a plant when the stamens and pistil are in distinct flowers.

_Monstera_—A genus of climbing aroids with edible fruit.

_Mucilaginous_—Sticky, gumlike, secreting mucilage.

_Mucuna_—A genus of Brazilian Leguminosæ, yielding the cowage (consisting of intensely irritating hairs), of the Materia Medica.

_Mutualism_—Interchange of some advantage, botanically applied to the union of two dissimilar plants which live in _close_ contact with each other to their mutual benefit.

_Mycelium_—The root-like colourless filaments of fungi.

_Mycetozoa_—A term applied to the slime-fungi.

N

_Nectary_—A honey secreting gland or spur.

_Nemophila_—A genus of dwarf annual flowering plants.

_Nepenthes_—A genus of plants having as a prolongation of the midrib of the leaves, ascidia or pitchers.

_Nocturnal_—Happening by night.

_Node_—The exact point on the stem from which the leaf is developed.

_Normal_—Regular, unaffected by any modification.

_Noxious_—Hurtful or poisonous.

_Nucellus_—The internal tissue of the ovule within which the embryo-sac is embedded.

_Nutrition_—The process and function of taking in food for the purpose of growth and to replace waste.

O

_Orchis_—A genus of the orchid family growing in the soil.

_Osmosis_—The passage of fluids through a membrane.

_Ovary_—The ovule case, that part of the carpel that bears ovules.

_Ovule_—The structure which after fertilisation forms the seed.

_Ovum_—The egg cell of the ovule.

_Oxalis_—The generic name of the wood sorrel.

_Oxygen_—A gas, one of the constituents of the atmosphere.

P

_Palisade-tissue_—A tissue of oblong cells placed side by side at right angles to the flat surface of the leaf.

_Papilionaceous_—Butterfly shaped.

_Pappus_—A light hairy development from the calyx of some plants.

_Parasitic_—The habit of growing upon and deriving nourishment from another plant.

_Pellucid_—Shining and transparent.

_Perennial_—Plants that live for an indefinite period.

_Perianth_—A term used when there is no distinction between calyx and corolla.

_Pericarp_—The ripened walls of the ovary constituting the structure of the fruit.

_Persistent_—Applied to the parts of the flower that remain on for some time.

_Petunia_—A genus of Brazilian Solanaceæ.

_Philodendron_—A genus of aroids usually climbers.

_Phleum_—A grass.

_Phloëm_—The inner bark, containing sieve-tubes.

_Phosphate_—A salt formed by the union of phosphoric acid with some base.

_Phyllotaxis_—The law of leaf arrangement.

_Physalis_—The generic name of the winter cherry.

_Physiological_—Having reference to the function or life work of the plant.

_Picea_—A genus of the Conifer family.

_Pinetum_—A garden devoted to the culture of pine-trees.

_Pinguicula_—The generic name of the butterworts.

_Pinus_—A genus of the Conifer family.

_Pistil_—The female part of the flower consisting of ovary, style, and stigma.

_Pistillate_—Applied to flowers having the pistil only.

_Pith_—The soft tissue in the centre of the stem.

_Plumbago_—The generic name of the leadworts, small flowering plants and shrubs.

_Plumule_—The first stem shoot of the germinating seed.

_Poa_—A grass.

_Poinsettia_—A genus of Mexican plants having bright scarlet bracts and small flowers.

_Pollard_—A tree trunk with its branches cut short.

_Pollen_—The fertilising or male part of the flower.

_Pollination_—The act of conveying the pollen from the stamen to the stigma.

_Polypetalous_—Separate or many petals.

_Polysepalous_—Separate or many sepals.

_Polytrichum_—The generic name of the hair moss.

_Potassium_—The metallic base of potash.

_Proboscis_—The feeling and feeding organ of an insect.

_Prothallus_—The first growth when the spore of a fern germinates.

_Protococcus_—A genus of unicellular plants forming a green stain upon trees, &c.

_Protonema_—The first growth of the moss-spore.

_Protoplasm_—A highly complex substance forming the essential part of all living cells, and to which all life growth is due.

_Prototypes_—First forms of plant-life.

_Psamma_—A genus of the grass family.

_Pseudo-bulb_—A swollen stem common in the epiphytic orchids.

_Pteris_—The generic name of the bracken fern.

Q

_Quiescent_—Inactive, dormant.

_Quinine_—An alkaloid extracted from the cinchona trees.

R

_Radicle_—The first formed root when a seed germinates.

_Rafflesia_—A genus of brown leafless parasites.

_Receptacle_—That part of the stalk on which the flower is developed.

_Resin_—A secretion from certain trees which hardens on exposure.

_Respiration_—The process of breathing.

_Rhinanthus_—The generic name of the yellow-rattle (a root parasite).

_Rhododendron_—A genus of popular flowering shrubs and dwarf trees.

_Root-cap_—A loose covering of tissue that protects the extreme point of the growing root.

_Root-hairs_—The delicate unicellular hairs found on the young root.

S

_Salicine_—A substance obtained from the bark of willows, soluble in water and alcohol, and crystallising in bright white needles.

_Salvia_—A genus of labiate plants.

_Samara_—Winged fruit.

_Saprophyte_—Plants that live upon decaying organic matter.

_Sarracenia_—The generic name of the North American side-saddle plants.

_Saxifraga_—A genus of dwarf Alpine plants.

_Scales_—Rudimentary leaves.

_Secretion_—Applied to substances like resin and honey, the production of assimilation and metabolism.

_Sedum_—A genus of succulent Alpine plants.

_Soluble_—Any substance that dissolves in water.

_Spadix_—The inflorescence of the Aroideæ.

_Spathe_—The bract of the Aroideæ.

_Sporangium_—The spore-case of some of the cryptogamia.

_Spurious_—False.

_Stapelia_—A genus of succulent plants, very poisonous and fœtid.

_Starch_—Colourless grains, a product of assimilation in the leaf.

_Stigma_—The receptive part of the pistil.

_Stipa_—A genus of the grass family.

_Stipules_—Small outgrowths at the base of the petiole.

_Stomata_—Minute pores in the epidermis of the leaf or green stem.

_Sulphate_—A salt formed by the combination of sulphuric acid with some base.

_Sycamore_—The plane tree of Scotland, Acer pseudoplatanus.

_Symbiosis_—Mutualism, a living for one another, interchange of benefits by united growth.

_Syncarpous_—United carpels.

T

_Tannin_—A substance widely diffused through the leaves and stems of plants, of an astringent character.

_Tap-root_—A root that forms an unbranched tapering axis: _Ex._, carrot.

_Tendril_—A coiled or hooked filament modified to assist plants to climb.

_Tentacles_—The glandular and feeler-like hairs of the sundew.

_Terminal_—At the apex or end.

_Testa_—The skin of seed.

_Tigellum_—The first stalk of the seed bearing the cotyledons.

_Tillandsia_—A New World genus of perching or epiphytic plants.

_Tissue_—A group of cells; having a common origin.

_Tormentilla_—A genus of small creeping rosaceous plants.

_Transpiration_—The giving off of water vapour from the surface of leaves and stems.

_Tricyrtis_—The generic name of the toad-lily.

_Tuber_—A fleshy root or succulent underground stem.

U

_Umbelliferæ_—A group of plants having an umbellate arrangement of the inflorescence or flower-head.