Quercus canbyi (Canby oak, Sierra oak), synonyms including Quercus graciliformis, is a North American species of oak tree.[1]
Quercus canbyi is a semi-evergreen - evergreen tree,[2] up to 40- tall in cultivation. Although, it can reach up to 80feet in the wild in Mexico. It starts as a pyramidal form and then matures into an open irregular shape.[3] It can reach a spread of 30- wide.[4]
The dark, glossy green leaves are 6- long and have serrated edges. The petioles can have a reddish hue.[5] It blooms in March and the acorns are then seen in August.[6] [7]
It has been distinguished from Quercus graciliformis by its twig shape and by producing acorns biennially rather than annually;[8] however, Plants of the World Online regards them as synonymous.[1]
Quercus canbyi was first described by William Trelease in 1924.[1] It is placed in Quercus section Lobatae.[9]
The species has been found only in Texas and in northeast Mexico.[1] [10]
Quercus canbyi was assessed in 2016 for the IUCN Red List as "least concern". Quercus graciliformis, regarded as a synonym by Plants of the World Online, was assessed as "critically endangered" in 2016.[11]
Quercus canbyi will tolerate most kinds of soils and is used in gardens to provide shade.[12]