| Quercus opaca | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Fagaceae |
| Genus: | Quercus |
| Subgenus: | Quercus subg. Quercus |
| Section: | Quercus sect. Quercus |
| Species: | Q. opaca |
| Binomial name | |
| Quercus opaca | |
Quercus opaca, commonly called the colonial oak, [2] is a species of evergreen shrub in the genus Quercus . It is found throughout northeastern Mexico.
Quercus opaca typically does not exceed 2 meters in height, with an average height of around 1-1.5 metres. [1] [3] The leaves of Quercus opaca are evergreen. They are oblong, lanceolate to elliptic in shape, measuring approximately 2.5 to 4.5 centimetres in length and 1 to 1.5 centimetres in width. The leaf apex can be acute, obtuse, or rounded, often with a mucronate tip. The base of the leaf is typically obtuse to cordate, sometimes rounded. The leaf margin is thickened and may appear flat or slightly rolled back. Most leaves are observed to be entire, although some may possess 1-3 pairs of sharp mucronate teeth near the apex. The adaxial surface has a glaucous appearance and appears dull. Small star-shaped hairs can be found at the base of the midvein. The abaxial surface is not lustrous and also appears glaucous. There are only a few sessile stellate trichomes and white glandular hairs that are mainly present on the midvein. The epidermis of the leaf is notably whitish papillose. The leaf veins consist of 6-10 pairs that are flat above and slightly raised beneath. The petiole measures 3-7 millimeters in length and is pubescent with a reddish-brown colour. [3]
Quercus opaca produces male catkins that are 3-4 centimetres long and contain many flowers. Quercus opaca's fruit is an ovoid acorn which measures around 9 millimetres long which is also glabrous. The acorn is partly enclosed by a cupule that is half-rounded and slightly tomentose. The acorns mature within the first year and are typically observed in September. They are solitary or appear in pairs on a glabrescent peduncle that is 0.5 centimetres long. [3]
The bark of Quercus opaca is grey and scaly in appearance. The twigs have a diameter of 1.5-2 millimeters and are sulcate, waxy, and covered in short pubescence consisting of sessile multiradiate trichomes and glandular hairs. Over time, the twigs become glabrescent. The buds are subglobose, measuring 1-2 millimetres in width, and have a brown color with pubescent scales along the margins. The stipules are pubescent and sometimes are deciduous.
Quercus opaca is found in the states of Hidalgo, Nuevo Leon, San Luis Potosi, and Tamaulipas in Mexico. This species is native to the Mexican Plateau region. Quercus opaca lives in arid tropical scrub habitats, usually 1200-2000 meters above sea level. [3]
Currently, there is a lack of data regarding the population size, population trends, and potential threats to the species. The absence of population data and threat assessments, along with under sampling, hinders researchers' ability to determine whether the species is at risk or not. Due to this, the International Union for Conservation of Nature classifies Quercus opaca as Data Deficient. [1]
Quercus pubescens, commonly known as the downy oak, pubescent oak or Italian oak, is a species of white oak native to southern Europe and southwest Asia. It is found from northern Spain (Pyrenees) and France in the West to Turkey and the Caucasus in the East.
Pachypodium brevicaule is a species of plant that belongs to the family Apocynaceae.
Quercus chrysolepis, commonly termed canyon live oak, canyon oak, golden cup oak or maul oak, is a North American species of evergreen oak that is found in Mexico and in the western United States, notably in the California Coast Ranges. This tree is often found near creeks and drainage swales growing in moist cool microhabitats. Its leaves are a glossy dark green on the upper surface with prominent spines; a further identification arises from the leaves of canyon live oak being geometrically flat.
Quercus durata, commonly known as leather oak, is a species of oak endemic to California, common in the Coast Ranges and the foothills of the Sierra Nevada. The common name "leather oak" is derived from the leathery texture on the lop of its leaves. Taxonomically it is placed in the white oak group.
Quercus hemisphaerica is a species of oak native to the southeastern and south-central United States. It is in the red oak section of Quercus sect. Lobatae. It is often confused with and closely related to Quercus laurifolia, from which it differs in several key characteristics.
Quercus parvula, the Santa Cruz Island oak, is an evergreen white oak found on north-facing Santa Cruz Island slopes and in the California Coast Ranges from Santa Barbara County north to Mendocino County. It was taxonomically combined with Quercus wislizeni until resurrected as a separate species by Kevin Nixon in 1980. The type locality of Q. parvula var. shrevei is Palo Colorado Canyon in Monterey County. It is placed in Quercus section Quercus.
Solanum chilense is a plant species from the "tomato" subgenus Lycopersicon within the nightshade genus Solanum.
Quercus franchetii, commonly known as the zhui lian li evergreen oak, is a species of oak in the Ilex section of the genus, native to a wide area of eastern Asia. It is an oak native to China, northern Thailand and Vietnam, growing at altitudes between 800 and 2,600 metres.
Dipterocarpus turbinatus is a species of tree in the family Dipterocarpaceae native to north-eastern India and mainland Southeast Asia, and cultivated in surrounding regions. It is an important source of the wood known as keruing, and is often used in the plywood industry.
Oplismenus compositus, the running mountaingrass, is a species of perennial plant from the family Poaceae that can be found throughout Asia, Africa, Australia, South America, Mexico and Hawaii.
Oplismenus thwaitesii is a flowering plant that is endemic to India.
Melica parodiana is a species of grass found in Buenos Aires, Argentina and Uruguay.
Solanum arcanum is a species of nightshade, commonly called the "wild tomato," endemic to Peru.
Quercus obtusata is an oak in the white oak group endemic to Mexico, with a distribution ranging from San Luis Potosí and Nayarit south to Oaxaca, from 620 to 2800 MSL.
Cadaba aphylla ("Swartstorm") is one of the many species in the genus Cadaba. It is indigenous to southern Africa.
Crassula atropurpurea is a succulent plant, very common and widespread in the southern Karoo regions of South Africa and Namibia.
Salix breviserrata is a species of willow belonging to the family Salicaceae. It is found in southern Europe in the Alps, and in the Iberian Peninsula in the Cantabrian Mountains, especially in the Picos de Europa, Somiedo, and the Sierra and Valle del Híjar.
Cryptocarya mackinnoniana is a species of tree in the Lauraceae family. Growing up to 25m in size, it is found in well developed rainforests from the Iron Range area on Cape York Peninsula south to Paluma in North Queensland, Australia. It was first botanically described by Ferdinand von Mueller in Fragmenta Phytographiae Australiae 5: 169 (1865).
Sandbergia is a genus of flowering plants belonging to the family Brassicaceae. They are also in the Boechereae Tribe.
Quercus panamandinaea is a species of oak tree native to Costa Rica and Panama. It belongs to the Lobata section of the subgenus Quercus and is named after its distribution in Panama and the Andean region. It prefers a wet, tropical biome.
