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habit - n. (L. habitus, condition, appearance,
dress) the external appearance or way of
growth of a plant, e.g. climbing, erect,
bushy, etc.; the tendency of a plant to grow
in a certain way.
habitat - n. (L. habitare, to inhabit) the locality or external environment in which a plant lives. halophyte - n. (Gr. hals, salt; phyton, plant) any species capable of tolerating 0.5% or more NaCl. haplophyte - n. (Gr. haploos, simple; eidos, form) having the number of chromosomes characteristic of the gametes for the organism. hapteron - n. (Gr. haptein, to fasten) holdfast, specialized root-like projections that function to anchor a plant. hastate - a. (L. hasta, spear) spear shaped, more or less triangular with the two basal lobes divergent. hemicryptophyte - n. (Gr. hemi, half; kryptos, hidden; phyton, plant) a perennial plant having its overwintering buds located at the soil surface. herb - n. (L. herba, green crop) any seed plant whose stem withers away to the ground after each season's growth; a seed plant with a green, non-woody stem. herbage - n. (Fr. herbe, an herb) herbs collectively; the green foliage and juicy stems of herbs. heterophyllous - a. (Gr. heteros, other; phyllon, leaf) the presence on a single individual of two or more distinct leaf shapes. These leaves may differ markedly in shape, yet have similar gross anatomical organization. heterozygote - n. (Gr. heteros, other; zygon, yoke) an organism or cell having two different alleles at corresponding loci on homologous chromosomes. hibernaculum - n. (L. hibernare, winter residence) a plant organ such as a bud, rhizome, turion, etc. which allows a plant to live through adverse conditions hilum - n. (L. hilum, a little thing, a trifle) the scar on a seed marking the place where it was attached to the seed stalk. hirsute - a. (L. hirsutus, bristly) set with bristles; hairy; shaggy. hispid - a. (L. hispidus, rough) having stiff hairs, spines, or bristles. hyaline - a. (Gr. hyalos, glass) of thin, membranous, transparent or translucent texture. hybrid - n. (L. hibrida, cross) any cross-bred plant; heterozygote. hydathodes - n. (Gr. hydatos, of water; hodos, way) an epidermal structure specialized for secretion, or for exudation, of water. hydric - a. (Gr. hydor, water) characterized by an abundant supply of water. hydrophily - n. (Gr. hydor, water; philein, to love) water pollination. hydrophyte - n. (Gr. hydor, water; phyton, plant) an aquatic plant living on or in water. hydropote - n. (Gr. hydropotes, water drinker) a cell or cell group found on the lower epidermis of some species such as Nymphaea. These cells are thought to function in the uptake of ions from the water. hypanthium - n. (Gr. hypo, under; anthodes, like flowers) an expansion of the receptacle of a flower that forms a saucer-shaped, cup-shaped, or tubular structure (often simulating a calyx tube) bearing the perianth and stamens at or near its rim; it may be free from or united to the ovary. hypertrophy - n. (Gr. hyper, above; trophe, nourishment) excessive growth due to increase in cell size. hypogynous - a. (Gr. hypo, under; gyne, female) inserted below the gynoecium, and not adherent; immediately below oogonium; the ovary thus said to be superior. n. hypogyny.
IAA - Indole-acetic acid, a natural growth hormone found in plants. idioblasts - n. (Gr. idios, one's own; blastos, a bud, offshoot) plant cells containing oil, gum, calcium, or other products, and appearing to help provide mechanical support. imbricate - a. (L. imbricare, to tile) having parts overlapping each other like roof tiles. immersed - a. (L. in, into; mergere, to dip, plunge) growing under water. imperfect flower - a flower containing stamen and pistil organs required for pollination but lacking sepals or petals or both of these organs. incised - a. (L. in, into; caedere, to cut) with sharp angles between the lobes; having deeply cleft margins. included - a. (L. in, in; claudere, to shut, close) not projecting beyond an enclosing part. incrassate - vt. (L. in, in; crassus, thick) becoming thick or thicker, especially toward a tip or margin. indehiscent - a (L. in, not; dehiscens, gaping) fruits which do not open to release seeds, but whole fruit is shed from the plant; not opening to release spores. indigenous - a. (L. in, within; gignere, to bear, produce) native; originating or occurring naturally in the place specified. indusia - an outgrowth of tissue that covers the spore producing structures in ferns. inflorescence - n. (L. inflorescere, to begin to blossom) a flower or putting forth blossoms; the mode of development and arrangement of flowers on an axis; a flowering branch. infructescence - n. (L. in, into; fructus, fruit) the inflorescence in a fruiting stage; collective fruits. inter- - (ME. enter-, inter-; OFr. entre-, inter-; L. inter- from inter, prep. between, among, during) a prefix meaning between, among - as intercellular. intercellular - adj. lying between cells, as intercellular space in plant tissue. interference - n. (L. inter, between; ferire, to strike) the overall influence of one plant or groups of plants on another, and encompasses allelopathy or competition, or both of these processes. internode - n. (L. inter, between; nodus, knot) the portion of a stem between nodes. intra- - (L., from intra, within, inside) a combining form meaning within, inside of, as intracellular. intracellular - adj., being or occurring within a body cell or within the body cells. intraspecific competition - a type of competition whereby an individual plant competes with one or more members of the same species for nutrients, space, light, etc. interspecific competition - competition between species for nutrients, space, light, etc. invasive exotic - an exotic that not only has naturalized but is expanding on its own in Florida plant communities. involucel - n. (L. involucrum, covering) a secondary involucre, as the bracts subtending the secondary umbels in the Umbelliferae. involucre - n., a group of closely placed bracts that subtend or enclose an inflorescence. involute - a. (L. involutus, rolled up) leaves having the edges rolled inwards at each side, toward the adaxial side. involution - n. (L. involutus, rolled up) a rolling inwards of leaves. |