Examples – Pyrus communis (Rosaceae), Cassia siamea (Caesalpinaceae) etc. Here flowers are borne in corymbose manner on the branches of the main axis or rachis. (ii) Compound corymb, also known as panicled corymb. (Dipterocarpaceae), Litchi chinensis (Sapindaceae) etc. This type is common in flowering plants e.g., Mangifera indica (Anacardiaceae), Vatica sp. (i) Panicle or Compound Raceme – Here the flowers are borne on the branches of the main axis (i.e., branched secondary axis) instead of on the primary axis directly. Modification of simple forms - here the primary floral axis or rachis bears secondary branches upon which flowers are developed. Example - Humulus lupulus (the hop, Cannabinaceae). (vii) Strobile – It is a modified spike, consisting of persistent membranous bracts or scales bearing pistillate (female) flower at each axil. In Triticum aestivum (wheat) the spikelets are many flowered and are borne on unbranched axis looking like a compound spike. In Oryza sativa (rice) the spikelets are one flowered as described above and the entire inflorescence is branched like a panicle. This type of inflorescence is the characteristic of the families Gramineae and Cyperaceae.īut the ultimate inflorescence formed by the spikelets are complex and compound. In a flower the perianth is usually represented by 2 or 3 lodicules which are very small, membranous and cuneate structures at the base of the ovary. C – Male spikelet of Maize with two male flowers. B – Many flowered (bisexual) spikelet of Wheat. Opposite to each lemma there stands a bracteole called palea. without flowers other bracts above it subtend flowers in their axils known as flowering glumes or lemmas. In a spikelet the lower first and second bracts, known as glumes, are empty i.e. floral axis may be very small or long produced beyond the glumes-the so-called bracts of this inflorescence. (vi) Locusta or Spikelet – This is a condensed spike subtending one or few flowers the rachilla i.e. It is found in members of Araceae (species of Colocasia, Amorphophallus etc.) as well as in many species of Palmae. (v) Spadix – It is a modified spike with fleshy rachis and large bract (the spathe) covering the inflorescence. Catkin is also found in some members of Euphorbiaceae, e.g. (iv) Amentum or Catkin – It is a spike of unisexual flowers with weak drooping peduncle which ultimately breaks off from the parent plant.Įxamples - families Juglandaceae (Engelhardtia spicata), Betulaceae (Corylus colurna), Salicaceae (Salix tetrasperma) etc.
No particular family can be assigned to it. Aerva aspera, Deringia amaranthoides (Amaranthaceae) and others.
(iii) Spike – Like raceme but flowers are sessile e.g.
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