Quercus greggii és una espècie de roure perennifoli que pertany a la família de les fagàcies i està dins de la secció dels roures blancs del gènere Quercus.
Creix a Mèxic als estats de Coahuila i Nuevo León, Sierra Madre i a Guatemala, entre els 2000 als 2900 m d'altitud.[1]
Quercus greggii és un petit arbre que creix fins als 10-12 m, de vegades només creix en forma d'arbust fins als 2 m en les altes elevacions i al nord de la seva àrea de distribució. L'escorça és de color gris fosc, escamosa. Les branques són primes i de color gris, amb petites lenticel·les destacades, el primer any tomentós, convertint glabrescents. Els brots són velluts, vermellosos, que fa entre 4 a 5 mm de llarg. Les fulles fan 4-7 per 3-5 cm, el·líptiques a obovals, gruixudes i coriàcies, l'àpex és obtús, base arrodonida o cordiforme, marge fortament enrotllat per sota, dentades a la meitat apical (1-4 parells de dents curtes), de vegades senceres, brillants, però aspres per sobre, tomentós i marró per sota, venes secundàries prominents per sota. Els pecíols fan entre 0,5 a 1 cm, densament pubescents. Les glans fan 2 cm de llarg, 1 cm de diàmetre, mucronats, entre 1 a 5 junts, sèssils o pedunculades curtes, la cúpula és escamosa, que tanca només 1/4 a 1/2 de la núcula i maduren al cap d'1 any.
Quercus greggii s'hibrida amb Quercus rugosa.
Quercus greggii és una espècie de roure perennifoli que pertany a la família de les fagàcies i està dins de la secció dels roures blancs del gènere Quercus.
Quercus greggi, otherwise known as the Mexican oak, is a monoecious semi-evergreen oak that is adapted to survive in arid conditions. It is native to Mexico and commonly grow around 2,000–3,300 metres (6,600–10,800 ft) north of the 24th parallel and spreads across multiple locales.
The plants grow to approximately 6.1–7.6 m (20–25 ft) in height (can be as small as 1.8 m or 6 ft) and 3–4.6 m (10–15 ft) in width with waxy rounded-ovular leaves that have dimensions of around 3–6 x 2–4 centimetres. The leaves are generally covered in a dense layer of trichomes. The bark is scale-like and light gray; it is covered in small lenticels, allowing the plants to undergo gas exchange with the surrounding atmosphere. The twigs of the plant are covered in thick woolly hairs.
Around April, the trees produce catkins that can have approximately 18 flowers are around 3–4.5 cm long. As the plants are monoecious (producing male and female cones on the same plant), they also produce female inflorescences. The female inflorescence generally grow around 2–4 flowers and are covered in trichomes, like the leaves of the plants. Like many more commonly known oaks, Mexican oaks utilize their male and female reproductive structures to produce the acorn nuts of the plant, which can appear alone or in clusters on small peduncles stemming from the main branches. The acorns contain a seed and eventually fall from the tree to start the growth of a new Mexican oak.
La Siberia is a cultivar of this species.
Quercus greggi, otherwise known as the Mexican oak, is a monoecious semi-evergreen oak that is adapted to survive in arid conditions. It is native to Mexico and commonly grow around 2,000–3,300 metres (6,600–10,800 ft) north of the 24th parallel and spreads across multiple locales.
The plants grow to approximately 6.1–7.6 m (20–25 ft) in height (can be as small as 1.8 m or 6 ft) and 3–4.6 m (10–15 ft) in width with waxy rounded-ovular leaves that have dimensions of around 3–6 x 2–4 centimetres. The leaves are generally covered in a dense layer of trichomes. The bark is scale-like and light gray; it is covered in small lenticels, allowing the plants to undergo gas exchange with the surrounding atmosphere. The twigs of the plant are covered in thick woolly hairs.
Around April, the trees produce catkins that can have approximately 18 flowers are around 3–4.5 cm long. As the plants are monoecious (producing male and female cones on the same plant), they also produce female inflorescences. The female inflorescence generally grow around 2–4 flowers and are covered in trichomes, like the leaves of the plants. Like many more commonly known oaks, Mexican oaks utilize their male and female reproductive structures to produce the acorn nuts of the plant, which can appear alone or in clusters on small peduncles stemming from the main branches. The acorns contain a seed and eventually fall from the tree to start the growth of a new Mexican oak.
La Siberia is a cultivar of this species.
Quercus greggii là một loài thực vật có hoa trong họ Cử. Loài này được (A.DC.) Trel. miêu tả khoa học đầu tiên năm 1922.[1]
Quercus greggii là một loài thực vật có hoa trong họ Cử. Loài này được (A.DC.) Trel. miêu tả khoa học đầu tiên năm 1922.
