Therefore, the correct answer is option C. The typical example is globe thistle (Echinops). In this plant the heads are small and one-flowered and are arranged together forming a big compound head. Mixed Inflorescence. In this inflorescence the main axis remains comparatively short and the lower flowers possess much longer stalks or pedicels than the upper ones so that all the flowers are brought more or less to the same level, e.g., in candytuft (Iberis amara). In this type of inflorescence, florets may be unisexual, bisexual and sterile. Spices. In this inflorescence there is a cup-shaped involucre, often provided with nectar secreting glands. The first of main floral axis gives rise to two lateral branches and these branches and the succeeding branches bear only one branch each on alternate sides. Privacy Policy3. The lemma is the lower, outer bract of the floret. Spike . Answer. The cymose inflorescence may be of four main types: (iii) Multiparous or polychasial cyme and. A kind of compound inflorescence is the double inflorescence, in which the basic structure is repeated in the place of single florets. Thus within var. What are the general characters of bryophytes? (i) With the main axis elongated, i.e., (a) raceme; (b) spike; (c) spikelets; (d) catkin and (e) spadix. ... becoming minutely pubescent on the inflorescence axis, usually with young shoots in the axils of the leaves Ocimum basilicum L. were analyzed by GC/EI-MS. Fifty components were identified in the inflorescence and leaf essential oils of the basil plants, accounting for 98.8 % and 99.9 % of the total quantified components respectively. Also known as umbel of umbels. Inflorescence type and habit: Terminal inflorescence, the cymes structure is thyrse. Verticillaster: This type of inflorescence is found in Labiate family. It has simple, opposite and decussate leaves, along a square stem, lanceolate oval in shape. Taxonomy: It is a natural hybrid formed by a cross of Ocimum americanum with O. basilicum. toothed or lobed. Welcome to BiologyDiscussion! ... becoming minutely pubescent on the inflorescence axis, usually with young shoots in the axils of the leaves The lower or older flowers possess longer stalks than the upper or younger ones, e.g., radish (Raphanus sativus), mustard (Brassica campestris), etc. Soc. Readers should always consult his/her physician before using or consuming a plant for medicinal purposes. The examples are common in Palmaceae (Palmae) family. The stalk of the individual flower of the inflorescence is called the pedicel. Racemose and Cymose Inflorescence | Botany, Inflorescence: Types and Special Types (With Diagram), Diversity in Modifications of Stems | Botany. Inflorescence size: Sometimes, the umbel is un-branched and known as simple umbel, e.g., Brahmi (Centella asiatica). It is not a substitute for medical advice or treatment and NParks does not purport to provide any medical advice. Phenylpropanoids (37.7 % for the inflorescence vs. 58.3 % for the leaves) were the predominant class of oil constituents, Racemose Inflorescence 2. Ocimum / ˈ ɒ s ɪ m ə m / is a genus of aromatic annual and perennial herbs and shrubs in the family Lamiaceae, native to the tropical and warm temperate regions of all 6 inhabited continents, with the greatest number of species in Africa. Male flowers are organised in a scorpioid manner. gratissimum inflorescence structure and stem, leaf and calyx indumentum form a continuum of variation. An inflorescence may be; simple, compound or of special types according to the mode of branching. de Guzman, C.C. Share Your Word File One whole inflorescence continuously blooms for 6 to 8 weeks. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. The involucre encloses a single female flower, represented by a pistil, in the centre, situated on a long stalk. Each flower arises in the axil of a bract eg. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments. Perennial up to 0.6 m tall with some woody tissue at the stem bases. Leaves are arranged in pairs with adjacent pairs perpendicular to one another. americanum. Leaves are broadly elliptical with a slightly toothed leaf margin (1.5-6 cm long, 1-2.5 cm wide). Cyathium: Cyathium inflorescence consists of small unisexual flowers enclosed by a common involucre which mimics a single flower. It consists of two clusters that develop from each of the two opposite axils of the leaves. This is a modified spike with a long and drooping axis bearing unisexual flowers, e.g., mulberry (Moras alba), birch (Betula spp. Welcome to the India Biodiversity Portal - A repository of information designed to harness and disseminate collective intelligence on the biodiversity of the Indian subcontinent. In addition the whole inflorescence remains surrounded by a series of bracts arranged in two or three whorls. It is the genus of basil and the name is from the Ancient Greek word for basil, ὤκιμον (ṓkimon). The capitulum inflorescence has been considered to be the most perfect. It is the mode of arrangement of flower in a group in a specialized branch called peduncle. The oldest flowers develop in the centre and youngest towards the periphery of the disc, such arrangement is known as centrifugal. Floral Bracts: The bracts are caudiform in shape and numerous in number. In the former case it becomes a compound raceme and in the latter case it becomes a compound cymose inflorescence. What is the significance of transpiration? Holy basil, (Ocimum tenuiflorum), also called tulsi or tulasi, flowering plant of the mint family (Lamiaceae) grown for its aromatic leaves. Usually a whorl of leafy bracts is found at the base of branches and also at the bases of flowers arranged in umbellate way. Ocimum sanctum, Ocimum tomentosum: Common Name: Holy Basil, Sacred Basil, 圣罗勒 ... Inflorescence Type Remarks: Racemose: Fruit, Seed and Spore. Typical example-cauliflower. Fruit : Nutlets 4, ellipsoid, smooth, brown metted with minute yellow and black spots, covered with short fringe of hygroscopic mucilaginous hairs. Pink or white flowers are tubular and 2-lipped. Disclaimer Copyright, Share Your Knowledge When the lateral axes develop successively on the same side, forming a sort of helix, the cymose inflorescence is known as helicoid or one-sided cyme, e.g., in Begonia, Juncus, Hemerocallis and some members of Solanaceae. Cultivation: This hybrid is best grown in containers. White to cream-coloured flowers are tubular and 2-lipped. Small clusters of 3 flowers are arranged in pairs along a spike-like, racemose inflorescence (8-10 cm long). Here the peduncle (main axis) is short and bears many branches which arise in an umbellate cluster. Also known as corymb of corymbs. IV. In this type of inflorescence the main axis (peduncle) branches repeatedly once or twice in racemose or cymose manner. Where are the pollen grains formed in the flower? It may be terminal or axillary in position. Just above the glumes, there is series of florets, partly enclosed by them. Inflorescence: Raceme type..there are more than 3 numbers of flowers. Simple Inflorescence A simple inflorescence maybe racemose or cymose according to the mode of branching. Ocimum / ˈ ɒ s ɪ m ə m / is a genus of aromatic annual and perennial herbs and shrubs in the family Lamiaceae, native to the tropical and warm temperate regions of all 6 inhabited continents, with the greatest number of species in Africa. Here the flowers develop in basipetal succession, i.e., the terminal flower is the oldest and the lateral ones younger. A special type of cymose inflorescence. Peduncles are of two types- receptacle and scape. In such cases the main axis remains elongated and it bears laterally a number of stalked flowers. RACEMOSE In this type of inflorescence, the main axis continues to grow and does not terminate in a flower and gives off flowers laterally in an acropetal manner (where old flowers are arranged on lower side and young flowers on upper side). Fruits: Fruits are composed of tiny, 1-seeded nutlets. It is the mode of arrangement of flower in a group in a specialized branch called peduncle. Cyathium 5. Some are in compound spikes (i.e., in wheat—Triticum aestivum), others are in racemes (e.g., in Festuca), while some are in panicles (e.g., in Avena). The usual structure of spikelet is as— There is a pair of sterile glumes at the base of spikelet, the lower, outer glume called the first, and the upper, inner one called the second. Compound 4. It is most advanced type of inflorescence, because all flowers are pollinated at same time. 1. The typical examples are found in Poaceae (Gramineae) family such as-wheat, barley, sorghum, oats, etc. Before sharing your knowledge on this site, please read the following pages: 1. Two varieties based on the types of O. gratissimum and either O. urticifolium or O. trichodon could be recognised as there are large morphological differences between the extremes of this continuum. The floral parts borne in the axil of lemma. The reasons are as follows: The individual flowers are quite small and massed together in heads, and therefore, they add to greater conspicuousness to attract the insects and flies for pollination. At the same time there is a considerable saving of material in the construction of the corolla and other floral parts. White flowers, in tube, are grouped at the base of the leaves. Crotolaria retusa, Cleome viscosa. A single insect may pollinate flowers in a short time without flying from one flower to another. ... Example- Ocimum, salvia. Different types of inflorescence that are observed are – 1. Name the types of nitrogenous bases present in the RNA. OCIMUM SANCTUM LINN. Mixed Inflorescence: In this category of inflorescence, the axis begins as a racemose inflorescence and exhibits branching in a cymose fashion. The whole inflorescence looks like an umbel, but is readily distinguished from the latter by the opening of the middle flower first, e.g., Ak (Calotropis procera), Hamelia patens, etc. Also known as spadix of spadices. This type of inflorescence is a condensed form of dichasial (biparous) cyme with a cluster of sessile or sub-sessile flowers in the axil of a leaf, forming a false whorl of flowers at the node. Inflorescence: Type # 1. In this inflorescence a whorl of bracts forming an involucre is always present, and each individual flower develops from the axil of a bract. Basil is one of the most popular and useful culinary and the main utilization forms of different basil types are fresh basil, frozen, dried, essential oil, and medicinal uses (Putievsky and Galambosi, 1999). Out of nine genotypes O. gratissimum (Ajowan and Rum tulsi), O. tenuiflorum (Krishna and Radha tulsi) and O. kilimandscharicum showed branched inflorescence and rest of the species showed unbranched or simple type of inflorescence.

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