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Boechera Gracilenta
''Boechera'' (rockcress) is a genus of the family Brassicaceae. It was named after the Danish botanist Tyge W. Böcher (1909–1983), who was known for his research in alpine plants, including the mustards '' Draba'' and ''Boechera holboellii''. According to recent molecular-based studies, ''Boechera'' is closely related to the genus ''Arabidopsis'' which also includes the widely known model plant ''Arabidopsis thaliana''. Until recently, members of this genus were included in the genus '' Arabis'', but have been separated from that genus based on recent genetic and cytological data. Unlike the genus ''Arabis'' (x=8) ''Boechera'' has a base chromosome number of x=7. Many taxa are triploid. ''Boechera'' is a primarily North American genus, most diverse in the western United States, and its distribution range also includes Greenland and the Russian Far East. The genus is poorly known, and species within are difficult to separate morphologically though some clearly distinct specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Stricta
''Boechera stricta'' ( syn. ''Arabis drummondii'', ''Boechera drummondii'', ''Turritis stricta''Al-Shehbaz, I.A., 2003. ''Transfer of most North American species of ''Arabis'' to ''Boechera'' (Brassicaceae)''. Novon 13(4): 381-391.) is a species of flowering plant in the mustard family known by the common name Drummond's rockcress. It is native to much of North America, including most of Canada, and the western and northeastern United States. Habitat and Description It can be found in many habitat types, including disturbed areas. It is a biennial or perennial herb growing one or more erect stems from a small caudex. The stems may branch near the top and reach heights anywhere between 30 and 90 centimeters. They are generally not hairy. There is a basal clump of widely lance-shaped leaves about the caudex, each up to 8 centimeters long. There are also widely spaced leaves along the stem. The top of the stem is occupied by a narrow inflorescence of flowers which are usually white, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Laevigata
''Boechera laevigata'' is a species of flowering plant in the mustard family known by the common name smooth rockcress. It is native to many areas of the eastern United States and Canada, where it grows in calcareous rocky woods and bluffs. It is moderately common throughout its range, although it is absent from the southeastern coastal plain and the far north. This species is a biennial herb growing from a single stem. It flowers in early spring and has persistent fruit. It is differentiated by other members of ''Boechera'' by its auriculate-clasping leaves, short white petals, and glaucous ''Glaucous'' (, ) is used to describe the pale grey or bluish-green appearance of the surfaces of some plants, as well as in the names of birds, such as the glaucous gull (''Larus hyperboreus''), glaucous-winged gull (''Larus glaucescens''), g ... stem. ReferencesFlora of North America laevigata Flora of North America {{Brassicales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Dentata
''Boechera dentata'', commonly called Short's rockcress, is a species of flowering plant in the mustard family (Brassicaceae). It is native to the eastern North America, where it is found in Canada and the United States. In the United States, its range is primarily centered in the Midwest, and in Canada it is only known from Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca .... Its natural habitat is in nutrient-rich alluvial forests and loamy bluffs, often on calcareous substrate. IllinoisWildflowers ''Boechera dentata'' is a short ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Crandallii
''Boechera crandallii'', or Crandall's rockcress, is found in Wyoming and Colorado where it is found on limestone chip-rock and stony areas, often among sagebrush. Flowering time is from May to June. According to chromosome counts by Rollins (1941 and 1966) ''B. crandalli'' has been identified as a diploid Ploidy () is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Sets of chromosomes refer to the number of maternal and paternal chromosome copies, respectively ... with n=7 which presumably reproduces sexually. References crandallii Flora of Colorado Flora of Wyoming Flora of North America {{Brassicales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Constancei
''Boechera constancei'' is a species of flowering plant in the mustard family known by the common name Constance's rockcress. It is endemic to California, where it is known only from the northern Sierra Nevada of Plumas and Sierra Counties. It is a member of the serpentine soils flora. This is a perennial herb growing from a branching, woody caudex. It produces one or more erect, hairless stems to maximum heights between 15 and 30 centimeters. The caudex is surrounded by a dense basal rosette of stiff, blue-green, lance-shaped leaves up to 3 centimeters long. There may be a few smaller leaves along the stem. The inflorescence produces 5 to 10 white mustardlike flowers with protruding stamens. The fruit is a hanging green silique A silique or siliqua (plural ''siliques'' or ''siliquae'') is a type of fruit (seed capsule) having two fused carpels with the length being more than three times the width. When the length is less than three times the width of the dried fruit i ... 4 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Cobrensis
''Boechera cobrensis'' ( syn. ''Arabis cobrensis'') is a species of flowering plant in the mustard family known by the common names Masonic rockcress and sagebrush rockcress. It is native to the western United States from eastern California to Wyoming, where it is found in sandy habitat, especially sagebrush. This is a perennial herb growing several erect, slender stems to heights near half a meter from a branching caudex. The plant forms a narrow clump with a base of narrow, linear, densely hairy leaves up to 5 centimeters long. There are also a few slightly shorter leaves clasping the stems at intervals. The top of each stem is occupied by an inflorescence of small, nodding flowers with dull yellowish sepals and white petals. The flowers give way to fruits which are narrow, straight silique A silique or siliqua (plural ''siliques'' or ''siliquae'') is a type of fruit (seed capsule) having two fused carpels with the length being more than three times the width. When the lengt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Canadensis
''Boechera'' (rockcress) is a genus of the family Brassicaceae. It was named after the Danish botanist Tyge W. Böcher (1909–1983), who was known for his research in alpine plants, including the mustards ''Draba'' and ''Boechera holboellii''. According to recent molecular-based studies, ''Boechera'' is closely related to the genus ''Arabidopsis'' which also includes the widely known model plant ''Arabidopsis thaliana''. Until recently, members of this genus were included in the genus ''Arabis'', but have been separated from that genus based on recent genetic and cytological data. Unlike the genus ''Arabis'' (x=8) ''Boechera'' has a base chromosome number of x=7. Many taxa are triploid. ''Boechera'' is a primarily North American genus, most diverse in the western United States, and its distribution range also includes Greenland and the Russian Far East. The genus is poorly known, and species within are difficult to separate morphologically though some clearly distinct species ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boechera Breweri
''Boechera breweri'' is a species of flowering plant in the family Brassicaceae known by the common name Brewer's rockcress. Distribution The plant is native to northern California and southern Oregon. It grows in rocky areas in mountains and valleys, including in the northern Sierra Nevada and the Klamath Mountains. Description ''Boechera breweri'' is a perennial herb growing from a woody, branching caudex. It produces hairy, erect stems to up to about 20 centimeters tall. There is a basal clump of leaves around the caudex. They are oval-shaped and up to 3 centimeters long. They are coated in forked hairs. There are also a few leaves farther up the plant with bases that clasp the stem. The flowers have dark purple sepals and lighter purple petals. The fruit is a long, thin, ascending silique up to 6.5 centimeters long. The flowers have thick pinkish-purple sepals and spoon-shaped pink to purple petals. The fruit is a long, narrow, purple silique A silique or siliqua ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pieris Oleracea
''Pieris oleracea'', or more commonly known as the mustard white, is a butterfly in the family Pieridae native to a large part of Canada and the northeastern United States. The nearly all-white butterfly is often found in wooded areas or open plains. There are two seasonal forms, which make it distinct from other similar species. Because of climate change, populations are moving further north. As indicated by the common name, ''P. oleracea'' adults and larvae primarily feed on plants in the mustard family, ''Brassicaceae''. The species is threatened by the rapid, and monoculture-forming, spread of the invasive species ''Alliaria petiolata'', which is toxic to larvae. Populations of ''P. oleracea'' have been declining.https://etd.ohiolink.edu/!etd.send_file?accession=wright1431882480&disposition=inline It may be that this butterfly is slowly adapting to garlic mustard. However, it may not be a fast enough process to ensure its survival, due to the high level of aggression on the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Sexuality
Plant reproductive morphology is the study of the physical form and structure (the Plant morphology, morphology) of those parts of plants directly or indirectly concerned with sexual reproduction. Among all living organisms, flowers, which are the reproductive structures of flowering plant, angiosperms, are the most varied physically and show a correspondingly great diversity in methods of reproduction. Plants that are not flowering plants (green algae, mosses, Marchantiophyta, liverworts, hornworts, ferns and gymnosperms such as conifers) also have complex interplays between morphological adaptation and environmental factors in their sexual reproduction. The breeding system, or how the sperm from one plant fertilizes the ovum of another, depends on the reproductive morphology, and is the single most important determinant of the genetic structure of nonclonal plant populations. Christian Konrad Sprengel (1793) studied the reproduction of flowering plants and for the first time it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridisation, which include genetic and morphological differences, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act before fertilization and others after it. Similar barriers exist in plants, with differences in flowering tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microsatellite (genetics)
A microsatellite is a tract of repetitive DNA in which certain DNA motifs (ranging in length from one to six or more base pairs) are repeated, typically 5–50 times. Microsatellites occur at thousands of locations within an organism's genome. They have a higher mutation rate than other areas of DNA leading to high genetic diversity. Microsatellites are often referred to as short tandem repeats (STRs) by forensic geneticists and in genetic genealogy, or as simple sequence repeats (SSRs) by plant geneticists. Microsatellites and their longer cousins, the minisatellites, together are classified as VNTR (variable number of tandem repeats) DNA. The name "satellite" DNA refers to the early observation that centrifugation of genomic DNA in a test tube separates a prominent layer of bulk DNA from accompanying "satellite" layers of repetitive DNA. They are widely used for DNA profiling in cancer diagnosis, in kinship analysis (especially paternity testing) and in forensic identifica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
