nomes no trilho de navegação
Suaeda nigra exhibits much phenotypic plasticity, as well as genetic variability, and is wide ranging. This combination has resulted in the naming of many variants that often reflect a response to localized or regional habitat conditions such as degree of wetness, salinity, or freezing temperatures (C. O. Hopkins and W. H. Blackwell 1977). In California and adjacent states, for example, glabrous plants (S. torreyana var. torreyana) and pubescent plants (S. torreyana var. ramosissima) occur throughout the distribution of the species. In California it is coastal but not estuarine in the San Francisco Bay area and in Orange and San Diego counties. Plants of northern latitudes or higher elevations that are prone to freezing tend to have annual stems from a woody base. Plants that occur in more southern or milder conditions are usually shrubs with perennial stems. Plants in seasonally flooded wetlands tend to be facultative annuals.
In the western and northern part of the range, most plants of Suaeda nigra are glabrous or sparsely pubescent and more or less long leaved. In parts of Texas and New Mexico and south into Mexico, densely villous, short-leaved plants occur, often on gypseous soils; they have been called S. suffrutescens var. suffrutescens, and var. detonsa when the flowers and leaves are glabrous. Plants from Texas with thickened and persistent leaf bases and corky-thickened segments of the fruiting perianth have been called S. duripes, known from only two collections that probably represent environmentally stressed individuals. Also in the Southwest, plants that are more herbaceous than S. suffrutescens and have a darker color have been called S. nigrescens.
Suaeda nigra,[2] often still known by the former name Suaeda moquinii,[3] is a species of flowering plant in the amaranth family, known by the vernacular names bush seepweed[2] or Mojave sea-blite.[3]
Suaeda nigra was first formally described as a new species by Constantine Samuel Rafinesque in 1832.[1][2] Its holotype was collected by Edwin James along the Canadian River in the Texas panhandle in 1820. In 1827 John Torrey tentatively misidentified this specimen as "Chenopodium maritimum L. ?",[2] but only in 1856 did Torrey finally describe the taxon as Chenopodina moquini.[2][4] In 1889 Edward Lee Greene moved it to the genus Suaeda (he continued to misspell it as moquini).[2][5] Aven Nelson corrected the name to moquinii in 1909, and the species was often known under the name Suaeda moquinii until the 21st century.[2][4]
Rafinesque had named the Texas specimen Chenopodium nigrum on the basis of Torrey's 1827 summary description of the specimen. In 1918 James Francis Macbride moved it to the genus Suaeda, but in 1977 C. O. Hopkins and W. H. Blackwell argued that this name was both a nomen nudum and superfluous (not based on a real holotype), only for H. J. Schenk and W. R. Ferren Jr. to argue in 2001 that Rafinesque had clearly referenced Torrey's description of the specimen, and that it was thus provided with both a formal taxonomic description as well as a type.[2]
Suaeda nigra is genetically diverse and quite variable in appearance.[2] The species is a shrub or subshrub growing from a woody base with many spreading branches, reaching up to 1.5 metres (4.9 ft) in height. The plants may be facultative annuals when they find themselves growing in seasonally flooded wetlands.[2]
It may be hairy to hairless but is usually waxy. It may be green to red to dark purple in color, sometimes almost black. The succulent leaves are linear to lance-shaped, 1 to 3 centimetres long, and flat or cylindrical.
Flowers occur in clusters along the upper stems, each cluster containing 1 to 12 flowers. Leaf-like bracts accompany the clusters. The flower has no petals and is composed of a calyx of fleshy, rounded sepals.
The fruit is an utricle that grows within the calyx.
Suaeda nigra is native to much of western North America, from central Canada through the Western United States, Great Basin, the Mojave Desert in California, and into northern Mexico.
It grows in many types of habitat with saline and alkaline substrates, such as desert flats, dry lakes (locally called 'playas') and seeps.
It is mostly an inland species but is occasionally seen in coastal areas, such as estuaries.[6]
Suaeda nigra, often still known by the former name Suaeda moquinii, is a species of flowering plant in the amaranth family, known by the vernacular names bush seepweed or Mojave sea-blite.
Suaeda nigra là loài thực vật có hoa thuộc họ Dền. Loài này được (Raf.) J.F. Macbr. miêu tả khoa học đầu tiên năm 1918.[1]
Suaeda nigra là loài thực vật có hoa thuộc họ Dền. Loài này được (Raf.) J.F. Macbr. miêu tả khoa học đầu tiên năm 1918.
