In between Oxydendrum and Polygonum which one has  about 220 species?
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Oxydendrum Sourwood or sorrel tree, Oxydendrum arboreum, is the sole species in the genus Oxydendrum, in the family Ericaceae. It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains. The tree is frequently seen as a component of oak-heath forests.
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Polygonum Polygonum is a genus of about 220 species of flowering plant in the buckwheat and knotweed family Polygonaceae. Common names include knotweed, knotgrass, bistort, tearthumb, mile-a-minute, smartweed and several others. In the Middle English glossary of herbs "Alphita" ( 1400-1425), it was known as ars-smerte. There have been various opinions about how broadly the genus should be defined. For example, Buckwheat ("Fagopyrum esculentum") has sometimes been included in the genus as "Polygonum fagopyrum".
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Pyrrosia Pyrrosia is a genus of about 100 fern species in the polypod family, "Polypodiaceae".
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Ptychopetalum Ptychopetalum is a genus of two species of flowering plants in the family Olacaceae (not to be confused with the Oleaceae or olive family), native to the Amazon rainforest. The indigenous name for the genus is Muira Puama, "potency wood". The species are shrubs or small trees growing to about 14 feet in height. Its leaves are short-petioled, up to 3 inches in length and 2 inches in breadth light green on upper surface, dark brown on lower surface. The inflorescences consist of short axillary racemes of 4 to 6 flowers each. The root is strongly tough and fibrous, internally light brown with thin bark and broad wood, has a faint odor, and tastes slightly saline and acrid.
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Polygonum tenue "Polygonum tenue", the slender knotweed or pleat-leaf knotweed, is a North American species of plants in the buckwheat family. it is widespread across south-central Canada (Ontario) and the eastern and central United States from Maine to Georgia, west as far as Minnesota, South Dakota, Nebraska, and Texas (though apparently now extirpated from Maine and New Hampshire).
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Polygoniodes Polygoniodes is a genus of moths of the Noctuidae family.
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Amaranthus polygonoides Amaranthus polygonoides is a species of flowering plant. It goes by the common name of tropical amaranth.
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Calligonum Calligonum is a genus of plants in the family Polygonaceae with about 80 species across the Mediterranean Sea region, Asia and North America.
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Polygonum spergulariiforme Polygonum spergulariiforme is a North American species of flowering plants in the buckwheat family known by the common name spurry knotweed or fall knotweed. It grows in western Canada (British Columbia and Saskatchewan) and the western United States (primarily Washington, Oregon, and northern and central California but with a few isolated populations in Idaho, Wyoming and Montana).
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Trigonachras Trigonachras is a genus of 8 species of trees known to science, constituting part of the plant family Sapindaceae.
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Xanthophyllum longum Xanthophyllum longum is a tree in the family Polygalaceae. The specific epithet "longum " is from the Latin meaning "long", referring to the petioles.
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Pogonatum urnigerum Pogonatum urnigerum is a species of moss in the family Polytrichaceae, commonly called urn haircap. It can be found on gravelly banks and similar habitats and can be identified by the blue tinge to the overall green colour.
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Sairocarpus Sairocarpus is a genus of the family Plantaginaceae, and is one of a group of plants commonly known as 'snapdragons'. It has twelve accepted species and is being considered to include many species formerly considered as New World species of "Antirrhinum".
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Phyllanthus Phyllanthus is the largest genus in the flowering plant family Phyllanthaceae. Estimates of the number species in this genus vary widely, from 750 to 1200. "Phyllanthus" has a remarkable diversity of growth forms including annual and perennial herbs, shrubs, climbers, floating aquatics, and pachycaulous succulents. Some have flattened leaflike stems called cladodes. It has a wide variety of floral morphologies and chromosome numbers and has one of the widest range of pollen types of any seed plant genus.
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Grevillea polychroma Grevillea polychroma , commonly known as Tullach Ard grevillea, is a species of the plant genus "Grevillea". It is endemic to the state of Victoria in Australia. The taxon was first formally described as a subspecies of "Grevillea brevifolia " in 2000. It was promoted to species status in 2005. The species is listed as "Rare in Victoria" on the Department of Sustainability and Environment's "Advisory List of Rare Or Threatened Plants In Victoria".
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Potamogeton polygonifolius Potamogeton polygonifolius or bog pondweed, is an aquatic plant. It is found in shallow, nutrient-poor, usually acid standing or running water, bogs, fens and occasionally ditches.
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Epidendrum tridens Epidendrum tridens ("the three-toothed "Epidendrum"") is a terrestrial orchid closely allied to "E. nocturnum", of which it has often been considered a variety or synonym. For example, Reichenbach 1861 lists "Epidendrum tridens" as a synonym of "Epidendrum nocturnum" and "Epidendrum nocturnum" var. "latifolium" as a distinguishable variety of "Epidendrum nocturnum".
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Pteropyrum Pteropyrum is a genus of plants in the family Polygonaceae with about five species in western Asia.
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Aroideae Aroideae is a subfamily of flowering plants in the Araceae family. It is the largest subfamily in Araceae and consists of about 72 different genera, and 2,300 species. Many Aroideae have spiny pollen grains without a sporopollenin outer exine layer and lacking an aperture.
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Polygala tenuifolia Polygala tenuifolia (Yuan Zhi) is an herb in the family Polygalaceae which is hardy to USDA Zone 6.
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Pyrethrum Pyrethrum was a genus of several Old World plants now classified as "Chrysanthemum" or "Tanacetum" (e.g., "C. coccineum") which are cultivated as ornamentals for their showy flower heads. Pyrethrum continues to be used as a common name for plants formerly included in the genus "Pyrethrum". Pyrethrum is also the name of a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium and Chrysanthemum coccineum.
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Polychrysum Polychrysum is a genus of flowering plants in the daisy family.