Quercus merrillii

Acorns and leaves are not drawn on same scale.

Quercus merrillii or Cyclobalanopsis merrillii is the only oak specie in the Philippines and is found in the province of Palawan. It may also be found in the island of Borneo. This specie is a shrub. The 2 cm. acorn is ovoid, brown and hairless (glabrous) half enclosed by a sessile cup with 7 to 8 denticulate rings. The 2-4 x 1-2 cm leaves are oval, rounded at both ends or attenuate at base; leathery but thin;  entire or remotely crenate in apical 1/3; shiny green above, whitish beneath; 6-8 pairs of secondary veins, raised beneath; petiole 2-3 cm long. (1)

Illustration: An array of four individual art cards. Pigment ink on 2.5"x3.5" Bristol boards.

Quercus obconica

Leaf and influrescens are not drawn on same scale.

Quercus obconica (Y.C.Hsu & Z.K.Zhou 1998). Synonyms: Cyclobalanopsis litoralis (Chun and Tam ex Hsu &Wei Jen 1979), Cyclobalanopsis macrocalyx var. litoralis (Hsu and Jen), Deng &Z.K.Zhou 2005

Found in China (Hainan) where it eaches 15 meters tall. It is not hardy.

The leaves measure 8-15x4-10 centimeters with 6-9 curved vein pairs, abaxial inconspicuous tertiary veins; ovate to obovate; leathery; apex is obtuse or shortly pointed; cuneate base, entire margin or slightly denticulate near apex, greyish green beneath, tomentose then later glabrous.

Fruits: May be 3 to 5 together. Measure 3 to 4.5 centimeters L, 2.2 to 2.8 centimeters W, ovoid to cylindrical with rounded apex. Enclosed 1/2 or 1/3 by cup; 3-5 mm thick, 2-3 cm H by 2.5-3 cm W, tomentose outside and silky inside. 9-12 concentric rings, basal rings always entire while others may be dentate. It matures in 2 years from October to December.

References: (1) (2) (3) (4)
Illustration: Pigment ink on 2.5"x3.5" Bristol Board