Quercus
Content
Description
Trees, sometimes buttressed, rarely with small stilt-roots.
Branchlets initially densely tomentose by simple or stellate hairs, or densely brownish, stiff pubescent, glabrescent;
Leaves spirally arranged, crowded near the top of the branchlets, or rarely pseudo-whorled;
Stipules extrapetiolar, linear-acute, densely tomentose or woolly pubescent, caducous.
Inflorescence male or female.
Fruit ovoid-conical, ovoid-globose or ovoid-cylindrical;
Distribution
Anambas Is present, Asia-Temperate: Hainan (Hainan present); Japan (Honshu present); Korea present, Asia-Tropical: Borneo present ‒ present ‒ present; Jawa (Jawa present); Malaya (Peninsular Malaysia present ‒ present); Sumatera (Sumatera present ‒ present); Thailand (Thailand present), Banka present, Billiton present, Burma present, E. and SE. Asia present, Japan present, Kanto Prov present, N. Sumatra present, NE. India present, Palawan present, Southern America: Argentina Northeast (Formosa present), W. and Central Java present, northern temperate zone, with an extension into the subtropics and tropics into W. Malesia (to 8° S) and the NE. corner of S. America present
Quercus has most of its c. 600 spp. in the northern temperate zone, with an extension into the subtropics and tropics into W. Malesia (to 8° S) and the NE. corner of S. America (see map in ). In Malesia occurs only Quercus subg. Cyclobalanopsis, which is confined to E. and SE. Asia, viz Japan (Kanto Prov., Honshu), Korea, China, Hainan, Formosa, Indo-China (with a centre of speciation), NE. India, Burma, Thailand; in Malesia it is found in Sumatra, the Malay Peninsula, Banka, Billiton, Anambas Is., W. and Central Java, Borneo, and Palawan. The wider spread species are rather equally spread over the Malay Peninsula, Sumatra, and Borneo, but few in Java. In Borneo occur 9 endemic spp., in N. Sumatra 1. .
Notes
The distribution of Malesian species of Quercus outside Malesia has but partially been investigated.
O. SCHWARZ () distinguished besides Cyclobalanopsis also Erythro-balanus and Macrobalanus as distinct genera; they are both New World taxa which, in my opinion, should not be segregated from Quercus.
O. SCHWARZ () distinguished besides Cyclobalanopsis also Erythro-balanus and Macrobalanus as distinct genera; they are both New World taxa which, in my opinion, should not be segregated from Quercus.
Citation
A.DC. 1864 – In: Prod.: 2
Hook.f. 1888 – In: Fl. Br. Ind.: 600
HUTCHINSON 1967 – In: Gen. Fl. Pl: 13
King 1889 – In: Ann. R. Bot. Gard. Calc.: 19
A. CAMUS 1938 – In: Chênes: 7
SOEPADMO 1968 – In: Gard. Bull. Sing.: 355
BARNETT 1942 – In: Trans. & Proc. Bot. Soc. Edinb.: 329
PRANTL 1889 – In: E. & P., Nat. Pfl. Fam. 3: 55
B. & H. 1880 – In: Gen. Pl: 407