nimet breadcrumb-navigoinnissa
Both stigmas of bistigmatic flowers often persist on the fruits, but sometimes one or both break away. The fruits of bistigmatic and 2-ovuled flowers are often larger than those of unistigmatic flowers.
From southern British Columbia to Baja California, especially near the coast but also at scattered sites inland, some plants having fewer bistigmatic flowers and smaller, rounded or tapering fruits have been called Sparganium eurycarpum var. greenei (Morong) Graebner or S. greenei Morong by some authors (e.g., H. L. Mason 1957; T. C. Brayshaw 1985) but not by others (e.g., C. L. Hitchcock 1969et al. 1955--1969, vol. 1; J. L. Reveal 1977A. Cronquist et al. 1972+, vol. 6). Such plants were placed in S. erectum Linnaeus, the strongly polymorphic and ecotypically variable Eurasian vicariant species, as S. erectum subsp. stoloniferum (Hamilton ex Graebner) C. D. K. Cook & M. S. Nicholls (C. D. K. Cook and M. S. Nicholls 1987). Sparganium eurycarpum is only weakly distinguished from S. erectum, largely on the basis of relative preponderance of bi- and unistigmatic flowers (± 50% in the two species, respectively), and by concomitant differences in fruit size and shape. In North America, however, some unistigmatic flowers occur among bistigmatic flowers on pistillate heads of many plants throughout the range of S. eurycarpum. Such unistigmatic flowers are common on some west-coast plants and on plants of alkaline marshes of the Great Basin and Great Plains, although there is considerable variation in all three areas. Because of these widespread variations, and in the absence of definitive, rangewide, comparative studies, our plants are here treated as S. eurycarpum. Comparative studies of Eurasian and North American plants, however, perhaps would show that all are best treated as S. erectum, the name with priority, but no such studies have been made.
Sparganium eurycarpum is a species of bur-reed known by the common names broadfruit bur-reed[1] and giant bur-reed. It is native to wetlands in Eurasia and North America. It is a clonal perennial, spreading by below-ground rhizomes. The common name, bur-reed, arises from the distinctive round clusters of fruits that take the form of a mace. It can be distinguished from all other species of bur-reed by the presence of two stigmas.
This species frequently occurs in areas with spring flooding, and may be emersed during periods of lower water. The buried rhizomes provide one method to survive periods of drought, fire, or ice scour.[2] The flowers are wind pollinated, the male flower clusters being separate and more highly elevated than the female.[3] It also produces large seeds, which can accumulate in the soil as buried reserves.[4] It can form dense stands under the right conditions; for example, Sparganium is one of the four main vegetation types in the Ottawa River, Canada.[5] Muskrats feed on the plant, particularly its rhizomes, while the seeds are an important food source for waterfowl.[1]
Sparganium eurycarpum is a species of bur-reed known by the common names broadfruit bur-reed and giant bur-reed. It is native to wetlands in Eurasia and North America. It is a clonal perennial, spreading by below-ground rhizomes. The common name, bur-reed, arises from the distinctive round clusters of fruits that take the form of a mace. It can be distinguished from all other species of bur-reed by the presence of two stigmas.
This species frequently occurs in areas with spring flooding, and may be emersed during periods of lower water. The buried rhizomes provide one method to survive periods of drought, fire, or ice scour. The flowers are wind pollinated, the male flower clusters being separate and more highly elevated than the female. It also produces large seeds, which can accumulate in the soil as buried reserves. It can form dense stands under the right conditions; for example, Sparganium is one of the four main vegetation types in the Ottawa River, Canada. Muskrats feed on the plant, particularly its rhizomes, while the seeds are an important food source for waterfowl.[1]
Sparganium eurycarpum es una planta acuática de la familia del junco (Typhaceae), dentro del orden Poales en lo que comúnmente llamamos grupo de las monocotiledóneas, aunque hoy en día se agrupan dentro del grupo Liliopsida; también se clasifica este género dentro de su propia familia Sparganiaceae. El nombre del género Sparganium se deriva del griego “Sparganion” un nombre que era usado por Dioscórides, un farmacólogo griego del siglo I d. C., la especie, S. eurycarpum, se deriva del griego “eury” (ancho) y “karpos” (fruto), es decir “fruto ancho”.[1][2]
Planta acuática, herbácea, robusta, de hasta 2,5 m de altura, hojas e inflorescencia emergentes; hojas erectas, quilladas, pero algunas veces aplanadas distalmente de hasta 2,5 m de largo y entre 6 a 20 mm de ancho; inflorescencias usualmente ramificadas y erectas. Se diferencia de S. americanum por su fruto sésil en forma de pirámide invertida y por presentar dos estigmas en cada flor (es la única especie en el género con esta característica).[3][4][2]
Tiene una amplia distribución en Canadá y Estados Unidos de América; en México solo se conoce de dos colectas, una en Baja California (Sierra de Juárez, cerca de Ensenada) y otra en el estado de México, dichas colectas se realizaron hace más de medio siglo.[4]
Dulceacuícola, o en ocasiones salobre, en lagos, zonas inundadas o canales, sobre una amplia variedad de sustratos, se ha colectado en México entre los 1,500 y 2,400 msnm.[4]
En México se le considera bajo la categoría de “En Peligro de extinción” (P) según la NOM-059-SEMARNAT-2010. Considerada como de Preocupación Menor (LC = Least Concern) por la Lista Roja de especies amenazadas de la IUCN.[5]
Sparganium eurycarpum es una planta acuática de la familia del junco (Typhaceae), dentro del orden Poales en lo que comúnmente llamamos grupo de las monocotiledóneas, aunque hoy en día se agrupan dentro del grupo Liliopsida; también se clasifica este género dentro de su propia familia Sparganiaceae. El nombre del género Sparganium se deriva del griego “Sparganion” un nombre que era usado por Dioscórides, un farmacólogo griego del siglo I d. C., la especie, S. eurycarpum, se deriva del griego “eury” (ancho) y “karpos” (fruto), es decir “fruto ancho”.
Sparganium eurycarpum là một loài thực vật có hoa trong họ Typhaceae. Loài này được Engelm. miêu tả khoa học đầu tiên năm 1867.[1]
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Bài viết liên quan đến Bộ Hòa thảo (Poales) này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn. Sparganium eurycarpum là một loài thực vật có hoa trong họ Typhaceae. Loài này được Engelm. miêu tả khoa học đầu tiên năm 1867.
