Tonduzia longifolia (A. DC.) Markgr.

Tonduzia longifolia (A. DC.) Woodson
Rauwoljia longifolia A. DC. in DC. Prodr. 8: 338. 1844. Rauwolfia stenophylla Donn. Smith, Bot. Gaz. 44: 115. 1907. Tonduzia parvifolia Pittier, Contr. U. S. Nat. Herb. 12: 103. 1908. Tonduzia stenophylla Pittier, Contr. U. S. Nat. Herb. 12: 104. 1908.
Small tree, 3-6 m. tall, essentially glabrous throughout; leaves predominantly ternate, occasionally quaternate, or the upper rarely opposite, subcoriaceous, narrowly oblong-elliptic, 8-17 cm. long, 1,5-2.5 cm. broad, gradually and obtusely acuminate, narrowly and acutely cuneate and more or less decurrent at the base, the petioles 5-15 mm. long; inflorescence congested, much shorter than the subtending leaves, bearing numerous, rather small, white flowers; pedicels 3-6 mm. long; calyx-lobes ovate, acute to obtusish, 1-1.5 mm. long; corolla salverform, the tube 3-5 mm. long, about 1 mm. in diameter at the base, the lobes obliquely oblongobovate, obtuse, 4-5 mm. long, spreading; stamens inserted at about the lower third of the corollatube ; follicles rather stout, 7-12 cm. long.
Type I.OCAI.ITY: Near San Miguel Sola [Oaxaca]. Distribution: Vera Cruz and Oaxaca; Salvador; Costa Rica.

Tonduzia macrantha Woodson, Ann. Mo. Bot. Gard
24: 12. 1937.
Small tree, about 8 m. tall, wholly glabrous; leaves ternate, or the upper opposite, firmly membranaceous, oblong-elliptic, 10-18 cm. long, 2-4 cm. broad, gradually acuteacuminate, decurrently cuneate at the base, somewhat lustrous above, the petioles 10-20 mm. long; inflorescence terminal or subterminal, irregularly cymose, much shorter than the subtending leaves, bearing several to numerous, white or cream-colored flowers of medium size; pedicels 5-7 mm. long; calyx-lobes ovate-deltoid, rounded, 1-1.25 mm. long; corolla salverform, the tube 7 mm. long, about 1.25 mm. in diameter at the base, the lobes oblongdel abr if orm, rounded, 9-10 mm. long, spreading; follicles rather stout, 10-12 cm. long.
Typb LOCAI.ITY: Volca'n Zunil, Quezaltenango, Guatemala; alt. 1650 meters. Distribution : Known only from the type locality.

Tonduzia pittieri Donn. Smith, Bot. Gaz. 49: 456. 1910
Shrub or small tree, 3-4 m. tall, essentially glabrous throughout; leaves ternate or quaternate, or rarely opposite above, firmly membranaceous, rather narrowly elliptic, 4-11 cm. long, 1-3 cm. broad, acutely acuminate to obtusish, acutely cuneate at the base, the petioles 4—5 mm. long; inflorescence congested, corymbose, much shorter than the subtending leaves, bearing numerous, rather small, white flowers; pedicels 3-4 mm. long; calyx-lobes ovate-triangular, acute, 0.5-0.75 mm. long; corolla salverform, the tube 4-4.5 mm. long, about 0.75 mm. in diameter at the base, the lobes rather broadly oblong-dolabriform, rounded, 4-5 mm. long, spreading; stamens inserted near or slightly below the middle of the corollatube; follicles unknown.
Type locality: Fiscal, Guatemala; alt. 1110 meters. Distribution: Guatemala.

Alstonia longifolia is a plant species in the genus Alstonia, family Apocynaceae. It is native to southern Mexico and Guatemala at an elevation of 1400–1800 m.

This is a tree up to 11 m (33 feet) tall. It is distinguished from related species by its corolla tube 7–10 mm long, with obovate lobes 4–6 mm x 2–3 mm.

Tonduzia longifolia là một loài thực vật có hoa trong họ La bố ma. Loài này được (A.DC.) Markgr. miêu tả khoa học đầu tiên năm 1924.