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FOC | Family List | FOC Vol. 12 | Tiliaceae | Tilia

16. Tilia amurensis Ruprecht, Mém. Acad. Imp. Sci. Saint Pétersbourg, sér. 7. 15(2) [Fl. Caucasi]: 253. 1869.

紫椴 zi duan

Trees to 25 m tall, 1 m d.b.h. Bark dark gray, exfoliating; branchlets white or reddish stellate pubescent, glabrescent; terminal bud glabrous, bud scales 3. Petiole slender, 2-3.5 cm, glabrous; leaf blade broadly ovate or ovate-orbicular, 4.5-6 × 4-5.5 cm, abaxially greenish, hairy only in vein axils, adaxially glabrous, lateral veins 4-5 pairs, base cordate or rarely obliquely truncate, margin serrate, teeth ca. 1 mm, pointed, apex acute, acuminate, truncate or slightly emarginate or 3-lobed. Cymes 3-20-flowered, slender, 3-5 cm, glabrous. Bracts on 1-3.5 cm stalk, narrowly band-shaped, 3-7 × 0.5-0.8 cm, adnate to peduncle for 1/3-1/2 of length, both surfaces glabrous. Pedicel 7-10 mm. Sepals broadly lanceolate, 5-6 mm, abaxially stellate puberulent. Petals 6-7 mm. Stamens 20, 5-6 mm; staminodes absent. Ovary canescent-tomentose; style ca. 5 mm, glabrous. Fruit ovoid-globose, 5-angled or obscurely angled, 5-8 mm, stellate tomentose; exocarp thickly leathery, fragile, indehiscent. Fl. Jul. 2n = 82.

Mixed Abies and Picea forests; 1300-1400 m. Heilongjiang, Jilin, Liaoning [Korea, Russia].

Tilia amurensis is similar to T. japonica but differs in having smaller leaves and bracts and a shorter cyme.

1 Leaf base truncate or slightly cordate; branchlets reddish stellate pilose.   16c var. taquetii
+ Leaf base cordate; branchlets white stellate pubescent   (2)
2 (1) Leaf blade 4.5-6 × 4-4.5 cm, hairy only in vein axils on abaxial surface.   16a var. amurensis
+ Leaf blade 3-4.5 × 2.5-4.5 cm, densely hairy on abaxial surface.   16b var. araneosa


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