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Main differences between Q. xylina, Q. obtusata, Q. praeco, Q. rugosa, Q. laeta and Q. deserticola |
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| Blade |
6-8 x 3-5 cm, coriaceous, flat, apex round and mucronate sometimes acute, base round or cordate |
6-16 x 4-8 cm, flat or sometimes slightly convexe, subcoriaceous, apex round , base rounded to cordate, |
4-10 x 2-6 cm |
4-16 x 3-10 cm, apex round sometimes acute, mucronate, base round or subcordate | 5-10 x 2-5 cm, coriaceous, stiff, apex mucronate, base round or subcordate |
4-9 x 1.5-3 cm, |
| Petiole | 0.7-1.3 cm long, glabrescent | 0.5-1.2 cm long, glabrescent | 0.3-1 cm long | 0.5-1.2 cm long, pinkish, downy | 0.2-1 cm long, pubescent | 0.2-0.6 cm long, tomentose |
| Margin | thick, slightly revolute, with 3-6 pairs of teeth in apical half | never entire, slightly revolute, 3-8 pairs of teeth with a short mucro turned to the abaxial face | flat or revolute, almost entire or with more or less long mucronate teeth | thick, + or - flat, with 3-10 pairs of teeth in apical 2/3, mucro not turned to the abaxial face | sometimes entire, thick, slightly revolute, ondulate or often with 3-6 pairs of teeth in apical 1/3 | revolute, sometimes entire, often 2-5 pairs of teeth or lobes with straight mucro |
| Leaf adaxially | glabrous, or with some glandular and stellate trichomes | simple and multiradiate trichomes along midrib, then glabrescent | often some stellate and fasciculate trichomes | glabrous, or with some stellate trichome near base | glabrous, or with some stellate trichome near base | some sparse, multiradiate trichomes along midrib |
| Leaf abaxially | dense, fluffy, persistent, glandular and fasciculate trichomes | some stellate and numerous glandular trichomes, abundant glandula secretions | same trichomes as adaxially but very dense | yellowish or light brown, with stellate and glandular trichomes | long pediculate stellate trichomes, sometimes glandular ones, without secretions | dense stellate trichomes and some glandular ones |
| Veins | 7-12 pairs, impressed above, raised underneath | 7-12 pairs, curved, slightly impressed above | 7-12 pairs, flat above or remotely impressed | 7-12 pairs, straight or curved | 6-11 pairs | 6-9 pairs, impressed above, raised beneath |
| Epidermis | papillose, whitish | papillose, whitish or pale green, slightly bullate | papillose, pale green | glaucous, waxy, bullate and papillose | papillose, pale glaucous | slightly bullate |
| Acorn | 1.5-2 cm long, 1 to 8 together on a 4-10 cm long peduncle | 1-1.6 cm, mostly globose, 1 to 5 together on a thin 2-3 cm long peduncle | 1.7-2 cm long, ovoid, peduncle 3-7 cm long | 2 cm long, acute, 1 to 8 together on a 2-7 cm long peduncle | 1 cm long, on a short peduncle or sessile | 1.5 cm long, ovoid, on a stout tomentose peduncle 0.3-1 cm long |
| Cupule | straight margin, enclosing 1/2 nut | halfround, straight margin | margin strongly rolled inside | pubescent, verrucose scales | pubescent scales thickened at base | straight margin, halfround, pubescent scales |