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FOC | Family List | FOC Vol. 23 | Zosteraceae

1. Zostera Linnaeus, Sp. Pl. 2: 968. 1753.

大叶藻属 da ye zao shu

Rhizome monopodial, with 2 vascular bundles in cortex. Shoots short, with several leaves; flowering stems usually elongated, with several spathes. Leaves linear, with 3-11 parallel veins, margin entire or rarely minutely denticulate; sheaths membranous or subleathery, with an auricle, ligulate. Spadix axillary, sessile, axis flattened, without or only with inconspicuous projections (retinacula). Plants monoecious; flowers unisexual, small. Anthers 2-celled. Style short; stigmas 2, filiform or subulate. Fruit ovoid, with a short beak.

About 12 species: best represented along shores of N temperate regions; five species in China.

1 Leaves 3-veined; sheaths open; projections present on each side of spadix axil.   5 Z. japonica
+ Leaves 5-11-veined; sheaths closed; projections usually absent   (2)
2 (1) Rhizomes slightly erect, with very short internodes; sheaths slightly leathery, persistent; leaf apex retuse.   2 Z. caespitosa
+ Rhizomes creeping, internodes elongated; sheaths usually membranous, not persistent; leaf apex obtuse or mucronate, rarely retuse   (3)
3 (2) Seeds longitudinally ribbed; leaves 5-7-veined.   1 Z. marina
+ Seeds smooth on surface; leaves 5-11-veined   (4)
4 (3) Leaves 5-8 mm wide, apex obtuse or mucronate; fruit ca. 4 mm.   3 Z. caulescens
+ Leaves 1-1.5 cm wide, apex truncate or retuse; fruit 5-6.5 mm.   4 Z. asiatica

Lower Taxa


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