Quercus acutissima Carruthers

[From Latin, quercus = the oak and acutus = sharpen]

Physical description: Quercus acutissima Carruthers is a tree native to China, Japan and Korea. It is widespread in temperate Asia and is even found in the US. The stems are greyish, lenticelled, and hairy. Leaves: simple, spiral and stipulate.

Common name: Sawtooth oak; kunugi (Japanese).

Uses: In China, the acorns are astringent and used to treat diarrhea, flux, prolapse of the rectum, to promote resorption of tuberculous nodules and to check menorrhagia. In Korea, the acorns are used to stop diarrhea. The pharmacological properties of this plant are yet unveiled. Are tannins involved here?

Fig. 55. Quercus acutissima Carruther. From: KLU 043859. The Forest Herbarium (BKF), Royal Forest Department. Flora of Thailand. Field collector & botanical identification: D Bunpheng, 29 Sep 1949. Geographical localization Thailand, Northeast: Loei, Phu Krading.

The stipules are deciduous. The petiole is long and flat above. The surface of the blade is lanceolate, glabrous, except the midrib, 16 cm x 5cm-4cm x 11 cm and coriaceous. The base of the blade is asymmetrical and the apex is acute. The margin is conspicuously toothed, and each tooth is 3 mm long. The blade shows 3-6 pairs of secondary nerves with tufts of hairs near the margin. The inflorescences are spikes. The fruits are glossy acorns with fluffy involucres of 2.5 cm diameter (Fig. 55).

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