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Glyptostrobus Endl.

水松属

Description from Flora of China

Trees semievergreen, monoecious; winter buds small; branchlets dimorphic: perennial and annual; perennial branchlets remaining green for several years, with white lines of stomatal dots, becoming ridged and grooved with decurrent leaf bases; annual branchlets deciduous, short, never developing scars or buds. Leaves spirally arranged, sessile, trimorphic: leaves on main branches, perennial branchlets (after 1st year), and fertile branchlets radially spreading, scalelike, relatively thick (resembling leaves of Cupressus but spirally arranged), persistent for 2 or 3 years; leaves on annual branchlets of mature trees in 3 rows, radially spreading, subulate, quadrangular in cross section (resembling leaves of Cryptomeria), deciduous with branchlet as a unit; leaves of annual branchlets of young trees and seedlings often 2-ranked, sessile, linear, flat, thin, deciduous (resembling leaves of Taxodium). Pollen cones terminal on short, erect branchlets bearing scalelike leaves, solitary, ellipsoid; microsporophylls 15-20, spirally arranged, sessile; pollen sacs (2-)5-7(-9). Seed cones terminal, shortly pedunculate, erect when mature, ± pyriform; bracts of mature cones ± completely connate with cone scales (free only at apex), triangular, recurved, borne on central or middle distal part of abaxial side of cone scales; ovules 2 per bract axil; cone scales 20-22, spirally arranged, sessile, woody, basal scales sterile, median scales 2-seeded, with 6-10 triangular, acute teeth at distal margin, distal scales ligulate, multiangular, sterile. Seeds ellipsoid, slightly flattened, small, with a single, terminal, recurved wing. Cotyledons 4 or 5. Germination epigeal. 2n = 22*.

One species: China, extinct in the wild in N Vietnam.

A Tertiary relict species, the only surviving member of a genus formerly widespread prior to the Quaternary glaciations. Resembling the American genus Taxodium (which is introduced in China) in its vegetative characters, and occurring in similar habitats.

药用植物园 Medicinal Plants Area, 引种苗圃 Introducing Plants Nursery

Lower Taxon


 

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