What are spikelets in plants?
spikelet. / (ˈspaɪklɪt) / noun. botany the unit of a grass inflorescence, typically consisting of two bracts (glumes) surrounding one or more florets, each of which is itself surrounded by two bractsSee lemma 1, palea. the small inflorescence of plants of other families, esp the sedges.
What are spikelets of wheat?
The wheat inflorescence is characterized by an unbranched spike, whereupon sessile spikelets are distichously attached to the inflorescence’s central axis (i.e., the rachis). In wheat, the number of spikelets per spike is fixed after the initiation of the terminal spikelet (Bonnet 1967; McMaster 1997).
What are spikelets in rice?
Background: The spikelet, often mistaken for a “flower”, is actually an inflorescence unit and can produce one or more florets in some species of grass. In rice, the spikelet contains one fertile terminal floret, one pair of sterile lemmas, and one pair of rudimentary glumes. …
What is Lemma in plants?
Lemma is a phytomorphological term referring to a part of the spikelet. It is the lowermost of two chaff-like bracts enclosing the grass floret. It often bears a long bristle called an awn, and may be similar in form to the glumes—chaffy bracts at the base of each spikelet.
What is capitulum in biology?
capitulum An inflorescence that consists of closely packed flowers or florets which have no stalks and arise on a flattened axis, all at the same level. The capitulum is surrounded or subtended by an involucre of bracts giving it the appearance of a single flower.
What are called Glumes?
In botany, a glume is a bract (leaf-like structure) below a spikelet in the inflorescence (flower cluster) of grasses (Poaceae) or the flowers of sedges (Cyperaceae). Glumes may be similar in form to the lemmas, the bracts at the base of each floret.
How do you count spikelets of wheat?
The formula Multiply the average numbers of spikes in three foot of row by the average number of spikelets per spike by the average number of kernels per spike by the kernel weight factor of 0.142 and divide the answer by the row width spacing.
How do you pollinate rice?
Rice pollination occurs when pollen grains fall by gravity from the anther onto the stigma and has been thought to be assured under suitable conditions. However, the position of the stigma relative to the anther pores may affect pollination.
What is stigma in flower?
Stigma: The part of the pistil where pollen germinates. Ovary: The enlarged basal portion of the pistil where ovules are produced.
What is wheat inflorescence?
Inflorescence of wheat is spike spikelet. It is a type of racemose inflorescence. Spikelets are sessile and directly attached to the rachis without pedicel.
What is a flower capitulum?
flower structure A head (capitulum) is a short dense spike in which the flowers are borne directly on a broad, flat peduncle, giving the inflorescence the appearance of a single flower, as in the dandelion (Taraxacum). This results in a grouping of small flowers in such a way as to appear as a single flower.
What is capitulum discuss with example?
1 : a rounded protuberance of an anatomical part (such as a bone) 2 : a racemose inflorescence (as of the sunflower) with the axis shortened and dilated to form a rounded or flattened cluster of sessile flowers — see inflorescence illustration.
What do flowers have spikes?
List of Spiky Flowers Bulbs, Corms and Tubers. Hyacinths (Hyacinthus orientalis) herald in the spring with spikes of purple, pink, yellow or white fragrant flowers on stems from 8 to 12 inches long. Annuals. Larkspur (Delphinium consolida) blooms in early summer in shades of pinks, purples, blues and white. Biennial. Perennials.
What is a spike flower?
A flower spike is a kind of inflorescence where a group of stalk-less flowers grow on an upright stem. The inflorescence of a plant is the arrangement of the individual flowers on the stem.
What is a spike plant?
Spike Plant. The spike plant was a common house plant for numerous years. However, it can grow outdoors as well. It is actually becoming very popular in gardens because the tall, spike like leaves add a lot of height and depth to the garden area.
What is terminal inflorescence?
In an indeterminate inflorescence there is no true terminal flower and the stem usually has a rudimentary end. In many cases the last true flower formed by the terminal bud (subterminal flower) straightens up, appearing to be a terminal flower.