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Manihot Walkerae
''Manihot walkerae'', commonly known as Walker's manihot, is a species of flowering plant in the spurge family, Euphorbiaceae, that is native to the Lower Rio Grande Valley of Texas in the United States and Tamaulipas in Mexico. The specific name honours amateur botanist Thelma Ratcliff (Mrs. E. J.) Walker, who discovered the type specimen near Mission and La Joya, Texas in 1942. Description ''Manihot walkerae'' is a perennial herb or small shrub that reaches a height of up to . The entire plant has an odor resembling hydrogen cyanide. Roots are carrot-shaped and tuberous, while stems are prostrate or ascending-erect. The peltate leaves are alternate, simple, glabrous, long and wide. They are palmately lobed, with 3-5 pandurate to halberd-shaped lobes. The white flowers occur in androgynous, axillary, subspicate racemes. The fruit is a dehiscent capsule in length. Habitat Walker's manihot generally grows under the branches of larger shrubs and trees. In Texas, this specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Léon Croizat
Léon Camille Marius Croizat (July 16, 1894 – November 30, 1982) was a French-Italian scholar and botanist who developed an orthogenetic synthesis of evolution of biological form over space, in time, which he called panbiogeography. Life Croizat was born in Torino, Italy to Vittorio Croizat (aka Victor Croizat) and Maria (Marie) Chaley, who had emigrated to Turin from Chambéry, France. In spite of his great aptitude for the natural sciences, Leon studied and received a degree in law from the University of Turin. Croizat and his family (wife Lucia and two children) emigrated to the United States in 1924; an avid artist, Leon worked selling his artwork for several years, but could not succeed economically as a working artist after the stock market crash of 1929. During the 1930s, Croizat found a job identifying plants as part of a topographic inventory performed in the public parks of New York City. During his visits to the Bronx Botanical Gardens, he became acquainted with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaf Shape
The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular or irregular, may be smooth or bearing hair, bristles or spines. For more terms describing other aspects of leaves besides their overall morphology see the leaf article. The terms listed here all are supported by technical and professional usage, but they cannot be represented as mandatory or undebatable; readers must use their judgement. Authors often use terms arbitrarily, or coin them to taste, possibly in ignorance of established terms, and it is not always clear whether because of ignorance, or personal preference, or because usages change with time or context, or because of variation between specimens, even specimens from the same plant. For example, whether to call leaves on the same tree "acuminate", "lanceolate", or "linear" could ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leucophyllum Frutescens
''Leucophyllum frutescens'' is an evergreen shrub in the figwort family, Scrophulariaceae, native to the U.S. state of Texas, where it is the official "State Native Shrub of Texas", and to the states of Coahuila, Nuevo León, and Tamaulipas in northern Mexico. Although commonly known as Texas sage, it is not a true sage and is distinct from the genus ''Salvia''. The species is also called Texas Ranger, Texas rain sage, ''cenizo'', Texas silverleaf, Texas barometerbush, ash-bush, wild lilac, purple sage, ''senisa'', ''cenicilla'', ''palo cenizo'', or ''hierba del cenizo''. The solitary axillary flowers are bell- or funnel-shaped, with five lobes and two lips. This species is found in rocky, calcareous soils. Cultivation Texas sage is a popular ornamental plant, commonly used for edge and area plantings in warmer and drier areas; it requires minimal water, is easily shaped into hedges, and blooms over the entire surface. It is available in a variety of cultivar A cultivar i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karwinskia Humboldtiana
''Karwinskia humboldtiana'', commonly known as coyotillo, cacachila or Humboldt coyotillo, is a species of flowering shrub or small tree in the family Rhamnaceae. It is native to southern and western Texas in the United States as well as much of Mexico. The seeds and leaves of this plant contain the quinones eleutherin and 7-methoxyeleutherin and chrysophanol and β-amyrin in the fruits that are toxic to humans and livestock. The toxins typically induce paralysis, which is often followed by death. However, it often takes days or even weeks after consumption for the symptoms to manifest. References humboldtiana ''Humboldtiana'' is a genus of American air-breathing land snails, terrestrial pulmonate gastropod mollusks in the subfamily Humboldtianinae. Anatomy Snails in this genus create and use love darts as part of their mating behavior. The scann ... Plants described in 1819 Flora of Mexico Flora of Texas Taxa named by Joseph Gerhard Zuccarini {{Rhamn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylindropuntia Leptocaulis
''Cylindropuntia leptocaulis'', the desert Christmas cactus, desert Christmas cholla, pencil cactus, or tasajillo, is a species of cholla cactus. Distribution and habitat ''Cylindropuntia leptocaulis'' is widely distributed in deserts, grasslands, chaparral, and woodlands in the Southwestern United States and several states in Northern Mexico. Description The shrubby ''Cylindropuntia leptocaulis'' plants reach tall, reaching the extreme height when supported within desert trees. Branches are narrow, 3–5 mm across. Spines 0-1 (occasionally as many as 3) at each areole. Flowers open in the late afternoon and are pale yellow or greenish yellow, with occasional red tips. Around December, the plant grows red berries that when consumed, can have an intoxicating effect. The fruits are crushed and mixed with a beverage by the Apache, Chiricahua, and Mescalero to produce narcotic effects. Gallery File:Desert_Christmas_Cactus_Sahuarita_Arizona.jpg, Desert Christmas Cactus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citharexylum Brachyanthum
''Citharexylum'' is a genus of flowering plants in the verbena family, Verbenaceae. It contains shrub and tree species commonly known as fiddlewoods or zitherwoods. They are native to the Americas, ranging from southern Florida and Texas in the United States to Argentina. The highest diversity occurs in Mexico and the Andes. The generic name is derived from the Greek words κιθάρα (''kithara''), meaning "lyre", and ξύλον (''xylon''), meaning "wood," referring to the use of the wood in the sounding boards of string instruments. Several species, especially '' C. caudatum'' and '' C. spinosum'', are cultivated as ornamentals. ;Species # ''Citharexylum affine'' D.Don - from northern Mexico to Nicaragua # '' Citharexylum alainii'' Moldenke - Dominican Republic # '' Citharexylum albicaule'' Turcz. - Cuba # ''Citharexylum altamiranum'' Greenm. - northeastern Mexico # ''Citharexylum andinum'' Moldenke - Bolivia, Jujuy Province of Argentina # ''Citharexylum argutedentatum'' Mold ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acacia Rigidula
''Vachellia rigidula'', commonly known as blackbrush acacia or chaparro prieto, and also known as ''Acacia rigidula'', is a species of shrub or small tree in the legume family, Fabaceae. Its native range stretches from Texas in the United States south to central Mexico. This perennial is not listed as being threatened. It reaches a height of . Blackbrush Acacia grows on limestone hillsides and canyons. Phytochemistry A phytochemical study of ''V. rigidula'' by workers at the Texas A & M University Agricultural Research and Extension Center at Uvalde, TX, reported the presence of over forty alkaloids, including low amounts (up to around 15 ppm) of several amphetamines that had previously been found by the same research group in the related species ''Senegalia berlandieri'', but which otherwise are known only as products of laboratory synthesis. Compounds found in the highest concentrations (ranging from a few hundred to a few thousand ppm) were phenethylamine, ''N''-methy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caliche
Caliche () is a sedimentary rock, a hardened natural cement of calcium carbonate that binds other materials—such as gravel, sand, clay, and silt. It occurs worldwide, in aridisol and mollisol soil orders—generally in arid or semiarid regions, including in central and western Australia, in the Kalahari Desert, in the High Plains of the western United States, in the Sonoran Desert, Chihuahuan Desert and Mojave Desert of North America, and in eastern Saudi Arabia at Al-Hasa. Caliche is also known as calcrete or kankar (in India). It belongs to the duricrusts. The term ''caliche'' is Spanish and is originally from the Latin ''calx'', meaning lime. Caliche is generally light-colored, but can range from white to light pink to reddish-brown, depending on the impurities present. It generally occurs on or near the surface, but can be found in deeper subsoil deposits, as well. Layers vary from a few inches to feet thick, and multiple layers can exist in a single location. A caliche laye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loam
Loam (in geology and soil science) is soil composed mostly of sand (particle size > ), silt (particle size > ), and a smaller amount of clay (particle size < ). By weight, its mineral composition is about 40–40–20% concentration of sand–silt–clay, respectively. These proportions can vary to a degree, however, and result in different types of loam soils: sandy loam, silty loam, clay loam, sandy clay loam, silty clay loam, and loam. In the , textural classification triangle, the only soil that is not predominantly sand, silt, or clay is called "loam". Loam soils generally contain more nutrients, moisture, and |
Calcareous
Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines. In zoology ''Calcareous'' is used as an adjectival term applied to anatomical structures which are made primarily of calcium carbonate, in animals such as gastropods, i.e., snails, specifically about such structures as the operculum, the clausilium, and the love dart. The term also applies to the calcium carbonate tests of often more or less microscopic Foraminifera. Not all tests are calcareous; diatoms and radiolaria have siliceous tests. The molluscs are calcareous, as are calcareous sponges ( Porifera), that have spicules which are made of calcium carbonate. In botany ''Calcareous grassland'' is a form of grassland characteristic of soils containing much calcium carbonate from underlying chalk or limestone rock. In medicine The term is used in pathology, for example i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tamaulipan Mezquital
The Tamaulipan mezquital ( es, Mezquital Tamaulipeco) is a deserts and xeric shrublands ecoregion in the southern United States and northeastern Mexico. It covers an area of , encompassing a portion of the Gulf Coastal Plain in southern Texas, northern Tamaulipas, northeastern Coahuila, and part of Nuevo León. Distribution The Sierra Madre Oriental range to the west separates the Tamaulipan mezquital from the drier Chihuahuan Desert. The Tamaulipan matorral is a transitional ecoregion between the mezquital and the Sierra Madre Oriental pine-oak forests to the west and the Veracruz moist forests to the south. The Western Gulf coastal grasslands, known as the Tamaulipan pastizal south of the border, fringe the Gulf of Mexico. The Edwards Plateau savannas lie to the north, and the East Central Texas forests and Texas blackland prairies to the northeast. Geography The Bordas Escarpment transects this ecoregion, running from near the southern limit northwest to the vicinity of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xeric
Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature. Deserts and xeric (ancient Greek xērós, “dry") shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area. Ecoregions in this habitat type vary greatly in the amount of annual rainfall they receive, usually less than annually except in the margins. Generally evaporation exceeds rainfall in these ecoregions. Temperature variability is also diverse in these lands. Many deserts, such as the Sahara, are hot year-round, but others, such as East Asia's Gobi, become quite cold in winter. Temperature extremes are a characteristic of most deserts. High daytime temperatures give way to cold nights because there is no insulation provided by humidity and cloud cover. The diversity of climatic conditions, though quite harsh, supports a rich array of habitats. Many of these habitats are ephemeral in nature, reflecting the paucity and seasonality of available water. Woody-stemm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
