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In botany, a perigynium (plural: perigynia), also referred to as a utricle, typically refers to a sac that surrounds the achene of plants in the genus Carex . [ 1 ] [ 2 ] The perigynium is a modified prophyll , also known as a glume , which is tissue of leaf origin that encloses the dry, one-seeded achene.
Buttercups usually flower in the spring, but flowers may be found throughout the summer, especially where the plants are growing as opportunistic colonizers, as in the case of garden weeds. The water crowfoots ( Ranunculus subgenus Batrachium ), which grow in still or running water, are sometimes treated in a separate genus Batrachium (from ...
Plants may bear either all bisexual flowers (hermaphroditic), both male and female flowers (monoecious), or only one sex (dioecious), in which case separate plants are either male or female flower-bearing. Where both bisexual and unisexual flowers exist on the same plant, it is called polygamous.
Most of the towns in this area are in an administrative region called "Holland Rijnland", a regional collaboration (samenwerkingsverband) consisting of various municipalities in the Duin- en Bollenstreek and the Leiden area. [2] This area is the southern part of a larger flower-growing area called the Bulb Region (Bollenstreek). However, it is ...
In an epigynous flower, the stamens, petals, and sepals are attached to the hypanthium at the top of the ovary or, occasionally, the hypanthium may extend beyond the top of the ovary. Epigynous flowers are often referred to as having an inferior ovary. Plant families with epigynous flowers include orchids, asters, and evening primroses.
Theophrastoideae is a small subfamily of flowering plants in the family Primulaceae. It was formerly recognized as a separate family Theophrastaceae . As previously circumscribed, the family consisted of eight genera and 95 species of trees or shrubs , native to tropical regions of the Americas .
A mature flower. In this example, the perianth is separated into a calyx (sepals) and corolla (petals) The perianth (perigonium, perigon or perigone in monocots) is the non-reproductive part of the flower, and structure that forms an envelope surrounding the sexual organs, consisting of the calyx (sepals) and the corolla (petals) or tepals when called a perigone.
The genus comprises herbaceous perennial plants, shrubs, and rarely small trees, growing 0.5–6 m (1.5–19.5 feet) tall, with bipinnate leaves. The flowers are produced in cylindrical or globose inflorescences and have numerous long slender stamens which give rise to the common names powder-puff, powder puff plant, and fairy duster.