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Polygonum (Greek for many-jointed). Including Persicaria, Bistorta, Tovara. Polygonaceae. Jointweed. Knotweed. Smartweed. Erect or twining plants, grown for ornament, the flowers and foliage often attractive.

Polygonum (Greek for many-jointed). Including Persicaria, Bistorta, Tovara. Polygonaceae. Jointweed. Knotweed. Smartweed. Erect or twining plants, grown for ornament, the flowers and foliage often attractive.

Most of the cultivated polygonums are hardy border plants, requiring no special skill or care. They are propagated by seed and division, chiefly the latter. The riuzomatous species, as those of the East Asian region, produce readily divisible plante. Some of the cultivated kinds are annual, as P. orientale, and this species is the only one that is known as a familiar flower-garden plant, although it is now little grown and the seed is difficult to secure in the trade. P..sachalinense is a robust coarse plant of some value where screening foliage is desired and to occupy intractable ground; it was once extravagantly advertised as a forage plant. P. baldschuanicum is an attractive and worthy climber, hardy in the northern states. P. Sieboldii is one of the best of the species for the back or bold border and is useful for forming single clumps when strong herbaceous foliage effects are desired. The other species are employed mostly in wild gardening or for similar effects. The amphibious kinds make interesting subjects for bog- gardens. The pink or red often curved spikes of the Persicaria group are sometimes very ornamental. The Asian set, from elevations in the Himalayan region and eastward to China and Japan, comprises very interesting plants for rock-gardens and herbaries. The polygonums provide good autumn-blooming plante.

Most of the cultivated polygonums are hardy border plants, requiring no special skill or care. They are propagated by seed and division, chiefly the latter. The riuzomatous species, as those of the East Asian region, produce readily divisible plante. Some of the cultivated kinds are annual, as P. orientale, and this species is the only one that is known as a familiar flower-garden plant, although it is now little grown and the seed is difficult to secure in the trade. P..sachalinense is a robust coarse plant of some value where screening foliage is desired and to occupy intractable ground; it was once extravagantly advertised as a forage plant. P. baldschuanicum is an attractive and worthy climber, hardy in the northern states. P. Sieboldii is one of the best of the species for the back or bold border and is useful for forming single clumps when strong herbaceous foliage effects are desired. The other species are employed mostly in wild gardening or for similar effects. The amphibious kinds make interesting subjects for bog- gardens. The pink or red often curved spikes of the Persicaria group are sometimes very ornamental. The Asian set, from elevations in the Himalayan region and eastward to China and Japan, comprises very interesting plants for rock-gardens and herbaries. The polygonums provide good autumn-blooming plante.

Index.

Index.

cuspidatum, 19.   Persicaria, 5. Zuccarinii, 19.

cuspidatum, 19.   Persicaria, 5. Zuccarinii, 19.

P. crispulum, Sims=Atraphaxis buxifolia.—P. cymosum, Trev. (Fagopyrum cymosum, Meissn. ). Puberulous perennial: lvs, triangular: fls. white, secund on long recurved branchee of cymes. Himalaya to China.—P. molle, Don. Shrubby perennial, allied to P. polystachyum, the branches stout, terete and villous: lvs. elliptic-lanceolate, pubescent or tomentose beneath: fls. white, in large thyrse-like tomentose terminal panicles. Himalaya.—P. multiflorum, Thunb. Tuberous-rooted climber, with reddish sts.: lvs. cordate-ovate, acute, shining: fls. small and whitish, in spreading panicles. China and Japan.—P. platycaulon, Hort.=Muehlen- beckia platyclada.—P. scandens, Hort., as once described, is a twiner, with firm lvs., cordate at base, dark green above and claret- colored beneath. G.C. III. 28:187.—P. sericeum. Pall. Stout perennial, 4 ft., free-branching, with spirea-like panicles in July and Aug. of white fls.: densely pubescent: lvs. subsessile, oval-oblong, lanceolate, attenuate at base: fls. in short simple racemes terminal or in upper axils. Siberia.—P. sphaerostachyum, Meissn. Allied to P. affine, from which it differs in the "dense broad cylindric or globose spike of blood-red pendulous fls.": tufted perennial, suitable for small rock-gardens. Himalaya. B.M. 6847. L H B

P. crispulum, Sims (Atraphaxis buxifolia).—P. cymosum, Trev. (Fagopyrum cymosum, Meissn. ). Puberulous perennial: lvs, triangular: fls. white, secund on long recurved branchee of cymes. Himalaya to China.—P. molle, Don. Shrubby perennial, allied to P. polystachyum, the branches stout, terete and villous: lvs. elliptic-lanceolate, pubescent or tomentose beneath: fls. white, in large thyrse-like tomentose terminal panicles. Himalaya.—P. multiflorum, Thunb. Tuberous-rooted climber, with reddish sts.: lvs. cordate-ovate, acute, shining: fls. small and whitish, in spreading panicles. China and Japan.—P. platycaulon, Hort. (Muehlen- beckia platyclada).—P. scandens, Hort., as once described, is a twiner, with firm lvs., cordate at base, dark green above and claret- colored beneath. —P. sericeum. Pall. Stout perennial, 4 ft., free-branching, with spirea-like panicles in July and Aug. of white fls.: densely pubescent: lvs. subsessile, oval-oblong, lanceolate, attenuate at base: fls. in short simple racemes terminal or in upper axils. Siberia.—P. sphaerostachyum, Meissn. Allied to P. affine, from which it differs in the "dense broad cylindric or globose spike of blood-red pendulous fls.": tufted perennial, suitable for small rock-gardens. Himalaya.

 

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==Gallery==

==Gallery==