Clethra mexicana DC.

Clethra lanata Mart. & Gal. Bull. Acad. Brux. 9^: 538. 1842
Yotmg twigs and petioles densely brown-tomentose. Leaves obovate, firm-chartaceous, 6-10 cm. long, 5 cm, wide or less, entire or sparingly dentate, rounded or acute at the apex, narrowed or cuneate at the base, glabrous or very nearly so above when old, densely brownishtomentulose beneath, especially on the veins, the lateral veins ascending, the slender petioles 8-15 mm. long; racemes 5-9, densely flowered, 10-16 cm. long, the rachis and pedicels tomentose; pedicels 1.5-3.5 mm. long; calyx 3-3.5 mm. long, its segments ovate, acutish or obtuse ; petals obovate, short-fimbriate, somewhat longer than the calyx; style about 2 mm. long; capsule puberulent, 4 mm. wide.
Typb i^ocawtv: Temperate regions of Oaxaca. Distribution: Oaxaca to Guatemala and Panama.

Clethra quercifolia Undl Bot. Reg. 28: pj, 23, 1842
Cletkra obo ata H. & A. Bot. Beech. Voy. 302. 1837. Not C. obovata R. & P. 1834. ? Kowalewskia serrulata Turcz. Bull. Soc. Nat. Mosc. 32i: 264. 1859. ? Clethra serrulata Turcz. Bull. Soc. Nat. Mosc. 362: 233. 1863.
A large shrub, with stout finely tomentulose twigs. Leaves coriaceous, obovate to elliptic, 6-16 cm. long, 4-10 cm. wide, strongly veined, the veins widely spreading, rather coarsely and sharply serrate, or some of them subentire, acute or obtuse at the apex, narrowed or obtuse at the base, loosely stellate-pubescent or becoming glabrous above, densely brownishtomentulose beneath, the stout tomentulose petioles 1-3 cm. long; racemes 3-7, stout, tomentose, 10-17 cm. long; pedicels stout, tomentose, 1.5-4 mm. long; bracts linear, as long as the pedicels or longer; calyx tomentulose, 4-4.5 mm. long, its segments ovate, acutish or obtuse; petals obovate, denticulate and ciliate, somewhat longer than the calyx; ovary densely villous; style about 3 mm. long; stigma 3-lobed.
Type locality : Jalapa, Vera Cruz.
Distribution: Vera Cruz, Morelos, and Federal District.

Clethra costaricensis Britton, sp. nov
Twigs stout, densely villous with long brown hairs. Leaves obovate or ellipticob ovate, chartaceous, 10-17 cm. long, sparingly undulate-dentate or entire, 8 cm. wide or less, darkgreen and loosely pubescent or becoming glabrous above, paler and densely villous beneath, obtuse or acutish at the apex, somewhat harrowed to the obtuse base, the stout, densely villous petioles 1.5-2.5 cm. long; racemes 4-6, densely brown-villous, 12-20 cm. long, the central one sometimes with 2 or 3 slender, divergent branches; pedicels ^-$ mm. long; calyx tomentose, 4 mm. long, its segments ovate-oblong, obtuse; petals obovate, erose, about one third longer than the calyx; style about 3 mm. long.
Type collected on the border of savannas of Cafias Gordas, Costa Rica, at 1100 m. altitude, February, 1897, H. Pittier 11115 (herb. N. Y. Bot. Gard.).

Clethra salvadorensis Britton, sp. nov
Young twigs, inflorescence, and under surfaces of the leaves densely shorttomentose. Leaves obovate or oblongobovate, subcoriaceous, 10-15 cm. long, 3.5-5 cm. wide, sparingly pubescent above, obtuse at the apex, narrowed at the base, the tomentose petioles 1-1,5 cm. long; racemes about 6, densely flowered, 6-10 cm. long; flowering pedicels 1-2 mm. long; calyx about 3 mm. long, its broadly ovate segments tomentulose, obtuse; petals broadly obovate, rounded, ciliate; style about 2 mm. long; capsule tomentulose, about 4 mm. broad.
Type collected at southern foot of the volcano Izalco, at 1000 m. altitude, Salvador, February 25, 1907, H. Pittier 1983 (U. S. Nat. Herb.).

Clethra mexicana DC. Prodr. 7: 590. 1839
Clethra integrifolia Moc; DC. Prodr. 7: 590, as synonym. 1839.
Clethra ovalifolia Moc.; DC. Prodr. 7: 590, as synonym. 1839.
Kowalewskia integerrima Turcz. Bull. Soc. Nat. Mosc. 32^: 264. 1859. (According to Hemsley.)
Clethra Kowalewskii Turcz. Bull. Soc. Nat. Mosc. 362; 233. 1863.
Young twigs, petioles, and rachis brown-tomentose. Leaves obovate, coriaceous, 6-12 cm. long, 4^6.5 cm. wide, finely pubescent above, even when old, densely brownish-tomentose, especially on the veins, beneath, entire or sparingly low-dentate, rounded at the apex, narrowed to the base, the lateral veins rather widely spreading, the stout petioles 1-2 cm. long ; racemes 3-5, 8-20 cm. long, the rachis stout; pedicels 3-7 cm. long; calyx 4-5 mm. long, tomentulose, its segments ovate-oblong, obtuse or acutish; petals obovate, erose, a little longer than the calyx; style about 3 mm. long; capsule tomentose, about 4 mm. broad.
Type tocALiTv: Mexico, Distribution: Jalisco and Sinaloa.

El mamojuaxtle (Clethra mexicana) es un árbol de la familia Clethraceae.​

Clethra mexicana là một loài thực vật có hoa trong họ Clethraceae. Loài này được DC. mô tả khoa học đầu tiên năm 1839.