| Quercus canbyi | |
| Author | Trel. 1924 Mem. Natl. Acad. Sci. 20:
188 1924. Diagnosis here |
| Synonyms |
alamarensis C.H.Mull. 1936 Diagnosis here |
| Local names | chisos oak; slender oak; canby oak; graceful oak; |
| Range | Mexico (Coahuila,
Nuevo Leon, Tamaulipas); Texas (Chisos Mountains ) ; from 0 to 2100 m
in rocky canyons ; restricted area; |
| Growth habit | 4-15 m tall,
with trunk 20-50 cm in diameter; long flexible branches somewhat drooping;
|
| Leaves | 4-10 x 1-4 cm;
semi-evergreen or lately deciduous; thick, subleathery; lanceolate, elliptic,
sometimes oval; apex pointed, bristle-tipped; base acute, obtuse or rounded;
margin thick, slightly revolute, with 5-6 pairs of bristle-tipped, short
teeth (from base to apex, or only on the apical 3/4) with shallow sinuses;
dark lustrous green above, hairless or sometimes with shorts stellate
hairs, and glandular ones, mostly along veins; dull, yellowish-green beneath,
glabrous or with axil tufts of fascicled hairs; 5-7 vein pairs, mostly
straight, flat above, slightly raised beneath; epidermis slightly papillose
; petiole hairless, slender, flexible, 1-2 cm long; |
| Flowers | April-May; |
| Fruits | acorn 1-1.5
cm, ovoid; peduncle 2-5 mm long; singly or to 2 together; cup covering
1/2 of nut, with nearly flat scales; maturing in 1 year from August to
October; |
|
Bark, twigs and |
bark
brown green, smooth, becoming dark grey, warty, sulcate; twig red brown,
shiny, thin (1 mm in diameter), soon glabrous, with rare, inconspicuous
lenticels; terminal bud red brown, ovoid to conical, 1.5-3 mm, shortly
ciliate; |
| Hardiness zone, habitat | hardy
zone 7; prefers dry, rocky soils; |
| Miscellaneous | --
A. Camus : n° 384; -- Sub-genus Quercus, section Lobatae, Series Erythromexicanae, Group Acutifoliae; -- Confusion is possible with Q. albocincta, which has ovate or elliptic leaves, more veins pairs, longer teeth, longer bristle-tips and longer petioles. -- Resembles Q. affinis but this species has coriaceous leaves, shorter |
| Subspecies and varieties |
--- Q.canbyi has been described as a variety of Q.graciliformis
in the south of its range (North Mexico), and differs from
the type in having acorns maturing in 1 year, less lobes (4 pairs instead
of 5...), and a shallower cup. In fact, it seems that it is nothing but
a geographical form...For today's Mexican Authors (Silvia
Romero Rangel, 2006), the accepted name is Q.canbyi, and Q.graciliformis
is the synonym... For POWO 2023, Q. graciliformis is a true
species, in Texas (Brewster County, Chisos Mountains). --- Q.alamarensis : --- Q.langtry (Langtry Oak) ; first considered as synonymous for Q.gravesii in 1850, is currently defined as a member of the graciliformis-canbyi group; discovered near Langtry (Texas), it bears 2 years maturing acorns and a greater number of lobes (5-7 instead of 2-5); but more studies are necessary to precise the taxonomical place of this species; hardiness zone : 7; |
| Pictures |
|
