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Tetrastigma is a genus of plants in the grape family, Vitaceae.The plants are lianas that climb with tendrils and have palmately compound leaves. Plants are dioecious, with separate male and female plants; female flowers are characterized by their four-lobed stigmas. [2]
The stigma, together with the style and ovary (typically called the stigma-style-ovary system) comprises the pistil, which is part of the gynoecium or female reproductive organ of a plant. The stigma itself forms the distal portion of the style, or stylodia, and is composed of stigmatic papillae , the cells of which are receptive to pollen.
The stigma (from Ancient Greek στίγμα, stigma, meaning mark or puncture) is usually found at the tip of the style, the portion of the carpel(s) that receives pollen (male gametophytes). It is commonly sticky or feathery to capture pollen. The word "pistil" comes from Latin pistillum meaning pestle.
Close-up of a Schlumbergera flower, showing part of the gynoecium (specifically the stigma and part of the style) and the stamens that surround it. Plant reproductive morphology is the study of the physical form and structure (the morphology) of those parts of plants directly or indirectly concerned with sexual reproduction.
The flowers are hermaphrodite, white, small and fragrant, and are grouped in branched terminal inflorescences in the form of panicles. The bracts are all of equal length or the outer ones are slightly shorter than the inner ones. The ovary is oval to spherical. The stigma is capitate or bowl-shaped. The fruits are enveloped by the enlarged bracts.
The flowers are solitary or borne in umbels. The flower has six petals each up to 5 centimeters (2.0 inches) long. They come in many shades of red, orange, yellow, green, purple, pink, and white, flecked and striped and streaked with darker colors. There are six curving stamens. The stigma has three lobes.
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Flower production and trade supports developing economies through their availability as a fair trade product. [140] View of the Tampere Central Square during the Tampere Floral Festival in July 2007. Flowers provide less food than other major plant parts (seeds, fruits, roots, stems and leaves), but still provide several important vegetables ...