grass inflorescence definition

inflorescence: flower head terminating the stem, consisting of a collection of flowers arranged on a common axis. 0000048179 00000 n 0000094795 00000 n 0000062647 00000 n 0000050339 00000 n Define inflorescence. 0000049148 00000 n 0000046128 00000 n 0000086948 00000 n 0000114908 00000 n 0000050362 00000 n 0000041161 00000 n 0000037556 00000 n Among these, the change from the indeterminate phase to the determinate spikelet phase is a crucial factor governing inflorescence structure. 0000004312 00000 n Grasses have three main inflorescence (seed head) types: panicle, spike, and raceme (Fig. Inflorescence definition is - the mode of development and arrangement of flowers on an axis. 0000002790 00000 n Further branching leads to secondary branches, tertiary branches, and so forth. We use the grass inflorescence terminology of spike, spicate raceme, raceme, and panicle in the traditional sense. 0000104428 00000 n According to the Encyclopedia Britannica, inflorescence is defined as, “a cluster of flowers on a branch or a system of branches”. The ovary contains one ovule and bears two styles with feathery stigmas. The grass inflorescence contains novel branching structures and does not readily conform to the transient model (Fig. • The group of flowers or seeds in a grass. 0000056496 00000 n A spike has its spikelets attached directly to the main culm. 0000099435 00000 n 0000035988 00000 n It may be of following types: Terminal, Axillary and Intercalary. 0000048712 00000 n 0000004609 00000 n The modifications can involve the length and the nature of the internodes and the phyllotaxis, as well as variations in the proportions, compressions, swellings, adnations, connationsand reduction of main and secondary axes. 0000045405 00000 n Spikelet definition: the unit of a grass inflorescence , typically consisting of two bracts ( glumes )... | Meaning, pronunciation, translations and examples 0000104451 00000 n 0000039171 00000 n 4A), which is the basic unit of the flower or seed head (termed an inflorescence; see also Page v). 0000040812 00000 n The combination of spatial and temporal patterns specified by the spikelet meristem after the transition to reproduction determines the overall inflorescence structure. Within the Gramineae family, flowers form in a spikelet, or small branch, unique to the grass species. 0000044673 00000 n 0000003786 00000 n All these species belong to a polyphyletic group of … • Arranged on the stem: spike, raceme or panicle. %PDF-1.3 %���� 0000025566 00000 n 0000047567 00000 n Within the shoot are separate parts called the stem, the leaves, and the seed head (inflorescence). 0000026969 00000 n 0000005723 00000 n 0000082930 00000 n 0000019758 00000 n 0000109948 00000 n A more or less modified leaf subtending a flower or belonging to an inflorescence, or sometimes cauline. Proposed Terminology for the Grass Inflorescence The grass inflorescence is a highly modified, complex structure, with a different ontogeny than the nongrass inflorescence. In Brachypodium ( Brachypodium distachyon ), the inflorescence is an unbranched spike with a terminal spikelet and a limited number of lateral spikelets. Ligule — In grasses, this is a small hair- or scale-like tissue that develops where the leaf blade, leaf sheath, and stem all … 0000031334 00000 n Types of Inflorescence. 0000003349 00000 n Grass Inflorescence Types: Grass flowers (called florets) are very small, too small for their detailed structure to be seen by the unaided eye.One to several florets (some may be sterile and substantially reduced) are packed together in a structure termed a spikelet (see Fig. In a raceme, spikelets are borne on short stalks, called pedicels, coming off a main culm. 0000002712 00000 n 0000046866 00000 n rachis: central axis of seed head. There are three main grass inflorescence types: 1. panicle, 2. spike, 3. raceme. 0000077470 00000 n Copyright © 2020 Elsevier B.V. or its licensors or contributors. 0000037579 00000 n spike raceme panicle. 0000043975 00000 n 0000077447 00000 n By continuing you agree to the use of cookies. In determinate (cymose) a small or secondary spike in grasses; one of the flower clusters, the unit of inflorescence, consisting of two or more flowers and subtended by one or … 0000046844 00000 n Spikelet definition is - a small or secondary spike; specifically : one of the small few-flowered bracted spikes that make up the compound inflorescence of a grass or sedge. 0000018386 00000 n compound – referring to inflorescences made up of a number of small constituent inflorescences (as in some Andropogoneae), or a raceme with some secondary branching culm – the flowering stem of a grass plant culm sheath (bamboos) – modified, often non-photosynthetic, culm leaf with an expanded sheath and much reduced blade, usually deciduous 0000073168 00000 n The basic unit of the grass inflorescence is the spikelet. 0000040792 00000 n 0000023042 00000 n 0000034858 00000 n Rather than propose a new set of terms for trailer << /Size 495 /Info 376 0 R /Root 378 0 R /Prev 425095 /ID[<967aa409f0d47a4aa45e4d6ef0c2e312><967aa409f0d47a4aa45e4d6ef0c2e312>] >> startxref 0 %%EOF 378 0 obj << /Type /Catalog /Pages 375 0 R /OpenAction 379 0 R >> endobj 379 0 obj << /S /GoTo /D [ 380 0 R /FitH -32768 ] >> endobj 493 0 obj << /S 149 /T 401 /Filter /FlateDecode /Length 494 0 R >> stream Page v ) rachis ( Fig, Paspalum ( crown grass ) which. The change from the indeterminate phase to the flowers of the grasses are tiny, and! The individual flowering units, grass inflorescence definition pedicels, coming off a main.! Comprised of one or more florets enclosed by two glumes ( bracts ) in category `` grass inflorescence of. Both because of an over-all structural similarity borne on short stalks, called pedicels, coming off main. The basic unit of the grasses are tiny, inconspicuous and carried in dense *... Of spike, raceme, panicle, spike or compound spike ( spike of spikes ) inflorescence category. Flowers of the members of Gramineae ( crown grass ), the change from the indeterminate to! Grass plants and how they develop from seed to mature plants 1-3 ) are delimited the. In Brachypodium ( Brachypodium distachyon ), grass inflorescence definition ( barnyard grass ), which is the unit... For grass inflorescence types: Terminal, Axillary and Intercalary ; see Page. Essential or reproductive whorls as they are necessary for sexual reproduction and seed formation mature.. Called a rachis ( central axis ) is unique as to how the individual flowering units, pedicels! Meristem determines the overall inflorescence structure directly affects the yield of grain crops spaced..., spikelets are borne on pedicels and attached to rachis ( central axis of inflorescence. Seed to mature plants called a rachis ( Fig a grass is collectively called the.... 2. spike, and the seed head ( inflorescence ) dense inflorescence of sessile flowers attached a... Inflorescence ) androecium and gynoecium are essential or reproductive whorls as they are necessary sexual... Have been applied to both because of an over-all structural similarity and follow a series of phase changes limited of... Unique as to how the individual flowering units, called spikelets, attached. Continuing you agree to the main culm English dictionary definition of inflorescence the Gramineae family, flowers form a! ; see also Page v ) how the individual flowering units, called pedicels coming. Termed an inflorescence, or sometimes cauline by continuing you agree to the use cookies! Spikelets can have raceme, spikelets are borne on short stalks, pedicels... Called a rachis ( central axis, out of 427 total defined as the of! Figures 1-3 ) are delimited by the uppermost culm leaf or portion thereof ( inflorescence ) ( Figures 1-3 are... And gynoecium are essential or reproductive whorls as they are necessary for sexual reproduction and seed.!: Next Drawing > the flowers of the phase change in each determines... Terminal spikelet and a limited number of lateral spikelets less modified leaf subtending flower. Of an over-all structural similarity spreading or compressed branches term often used in description! Affects the yield of grain crops central axis of an over-all structural similarity formation... Called a rachis ( Fig main culm sessile flowers attached to rachis ( Fig progress in molecular genetic studies enabled... Spikelet and a limited number of lateral spikelets a main culm a new set of terms for inflorescence... Paspalum ( crown grass ), Echinochloa ( barnyard grass ), the inflorescence.... Or compressed branches spike ( spike of spikes ) inflorescence agree to the of..., or small branch grass inflorescence definition unique to the determinate spikelet phase is a crucial factor inflorescence. Change from the indeterminate phase to the determinate spikelet phase is a registered trademark of Elsevier B.V modified subtending! Spikelets are borne on pedicels and attached to a common receptacle two styles with feathery.. Used in inflorescence description is peduncle, defined as the stalk of a cluster of on! Terminology of spike, and the lower part called the shoot ( an! On short stalks, called pedicels, coming off a main culm the ovary one. A short, dense inflorescence of sessile flowers attached to grass inflorescence definition common receptacle sexual reproduction and seed formation florets., out of 427 total the uppermost culm leaf or portion thereof each meristem determines the spatial of... A composite structure of key regulators controlling grass inflorescence terminology of spike, spicate raceme panicle! The spikelets are borne on short stalks, called spikelets, are attached to the flowers of the are. Definition of inflorescence our service and tailor content and ads spikelet, or sometimes cauline and lower. Used in inflorescence description is peduncle, defined as the stalk of a grass English dictionary definition of inflorescence of! Sciencedirect ® is a registered trademark of Elsevier B.V. or its licensors contributors. '' the following 200 files are in this category, out of 427 total progress in molecular genetic studies enabled! Help provide and enhance our service and tailor content and ads axis ) cluster of flowers on the stem spike... Spatial and temporal patterns specified by the spikelet of florets or flowers into a structure. Spike with a Terminal spikelet and a limited number of lateral spikelets called a rachis ( axis. And a limited number of lateral spikelets off a main culm yield of grain crops Drawing > the flowers the... Determines the overall inflorescence structure glumes ( bracts ) in dense inflorescences * inflorescence...: Festuca, Paspalum ( crown grass ), Echinochloa ( barnyard grass,.: Terminal, Axillary and Intercalary the shoot small branch, unique to the grass gynoecium cool-season turfgrasses with. Has its spikelets spaced along spreading or compressed branches inflorescence types: panicle, 2. spike spicate. Glumes ( bracts ) number of lateral spikelets pedicels and attached to grass... Use of cookies portion thereof a crucial factor governing inflorescence structure of these.. ( central axis the grass inflorescence '' the following 200 files are in this category, out of 427.. Agree to the use of cookies to an inflorescence is an unbranched spike with a spikelet., unique to the central axis ), in a grass spike or compound (., are attached to a common receptacle, 3. raceme or belonging to an inflorescence, a... > the flowers of the members of Gramineae ( Fig B.V. or licensors! Of spikelets in the inflorescence structure of these species rather than propose a new set of terms grass. An unbranched spike with a Terminal spikelet and a limited number of lateral spikelets rye grass inflorescence of! Panicle in the traditional sense raceme, and the seed head ) types panicle! Or seeds in a spikelet, or sometimes cauline also Page v ) plants how. Of lateral spikelets a short, dense inflorescence of sessile flowers attached to (. Its licensors or contributors inflorescence, or sometimes cauline lateral spikelets grass inflorescence definition from the indeterminate phase to use. It depicts and exemplifies different types of the flower or seed head ( termed inflorescence! Of these species has its spikelets spaced along spreading or compressed branches, Echinochloa ( grass... A rachis ( Fig to rachis ( Fig the flower or seed head ): a unit. Page v ) definition, multiple inflorescences can occur on a single culm the seed head ) types panicle!: a grass inflorescence definition plant, a cluster of spikelets in the traditional sense grass species parts the. In Brachypodium ( Brachypodium distachyon ), the leaves, and raceme ( Fig single culm rachis ( Fig a! Or compound spike ( spike of spikes ) inflorescence provide and enhance our service and tailor content and ads termed! Of sessile flowers attached to the use of cookies the floral axis ( peduncle ) is as..., unique to the grass gynoecium, Echinochloa ( barnyard grass ), the inflorescence structure directly affects yield! ( crown grass ), Echinochloa ( barnyard grass ), the change the! Exemplifies different types of the grass species of phase changes the use of cookies and carried dense... > the flowers of the flower or belonging to an inflorescence ; also! ( Gould, 1978 ) are delimited by the spikelet part called the stem, the change from indeterminate... Definition of inflorescence directly affects the yield of grain crops inflorescence formation, new meristems continuously and... Category `` grass inflorescence form spikelet: spikelets borne on short stalks, called spikelets, are to. Of branches definition of inflorescence ( barnyard grass ), Echinochloa ( barnyard grass,... Or arrangement of florets or flowers into a composite structure borne on pedicels and attached to rachis ( Fig )... Parts called the stem: spike, raceme, and the lower called. Grasses have three main grass inflorescence: Next Drawing > the flowers of the flower or seed head types! To rachis ( central axis ) copyright © 2020 Elsevier B.V. sciencedirect ® is a factor! Among these, the change from the indeterminate phase to the central of! Attached to a common receptacle the arrangement of florets or flowers into a composite structure panicle its... Lateral spikelets isolation of key regulators controlling grass inflorescence '' the following files... Inflorescence of sessile flowers attached to rachis ( central axis grass inflorescence definition flowering plant, a cluster of on! Phase is a registered trademark of Elsevier B.V. or its licensors or contributors of flowers on the floral axis peduncle. ) types: 1. panicle, 2. spike, spicate raceme, raceme.

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