Question: What are are commonly known as milkworts or snakeroots, Nothofagus or Polygala ?

Context paragraphs:
Polygala lutea: Polygala lutea, commonly known as orange- or yellow milkwort, is a herbaceous plant native to the United States.

Ulmus parvifolia: Ulmus parvifolia, commonly known as the Chinese elm or lacebark elm, is a species native to eastern Asia, including China, India, Taiwan, Japan, North Korea, and Vietnam.  It has been described as "one of the most splendid elms, having the poise of a graceful "Nothofagus"".

Polygala nana: Polygala nana, commonly known as candyroot or low bachelors' buttons, is a very small herbaceous plant which is native to the southeastern United States.  The root has a sweet liquorice flavor when it is chewed, but it is usually hidden underground until the plant flowers.  The seeds of candyroot are dispersed by ants.

Nothofagus: Nothofagus, also known as the southern beeches, is a genus of 43 species of trees and shrubs native to the Southern Hemisphere in southern South America (Chile, Argentina) and Australasia (east and southeast Australia, New Zealand, New Guinea and New Caledonia).  The species are ecological dominants in many temperate forests in these regions.  Some species are reportedly naturalised in Germany and Great Britain.  The genus has a rich fossil record of leaves, cupules and pollen, with fossils extending into the late Cretaceous and occurring in Australia, New Zealand, Antarctica and South America.  In the past, they were included in the family Fagaceae, but genetic tests revealed them to be genetically distinct, and they are now included in their own family, the Nothofagaceae (literally meaning "false beeches" or "bastard beeches").

Polygala amarella: Polygala amarella (or "P. amara"), commonly known as dwarf milkwort, is a plant of the family Polygalaceae.  A European native it grows on chalky grass land and limestone mountain pastures.

Chalciporus piperatus: Chalciporus piperatus, commonly known as the peppery bolete, is a small pored mushroom of the family Boletaceae found in mixed woodland in Europe and North America.  It has been recorded under introduced trees in Brazil, and has become naturalised in Tasmania and spread under native "Nothofagus cunninghamii" trees.  A small bolete, the fruit body has a 1.6 – orange-fawn cap with cinnamon to brown pores underneath, and a 4 – high by 0.6 – thick stipe.  The rare variety "hypochryseus", found only in Europe, has yellow pores and tubes.

Fuscospora alessandri: Fuscospora alessandrii (ruil) is a species of plant in the family Nothofagaceae, commonly known as the southern beeches.  It is endemic to Chile, occurring chiefly in the Chilean matorral ecoregion.  It is threatened by habitat loss.  The species is protected within Los Ruiles National Reserve.  It was known as "Nothofagus alessandrii" prior to 2013.

Polygala: Polygala is a large genus of flowering plants belonging to the family Polygalaceae.  They are commonly known as milkworts or snakeroots.  The genus is distributed widely throughout much of the world in temperate zones and the tropics.  The genus name "Polygala" comes from the ancient Greek "much milk", as the plant was thought to increase milk yields in cattle.

Fuscospora fusca: Fuscospora fusca, commonly known as red beech (Māori: tawhai raunui) is a species of southern beech, endemic to New Zealand, where it occurs on both the North Island and South Island.  Generally it is found on lower hills and inland valley floors where soil is fertile and well drained.  It was known as "Nothofagus fusca" prior to 2013.

Cyttaria gunnii: Cyttaria gunnii, commonly known as the myrtle orange or beech orange, is an orange-white coloured and edible ascomycete fungus native to Australasia.  It is a specific parasite of myrtle beech ("Nothofagus cunninghamii") trees.

Supporting paragraphs: Nothofagus Polygala
Answer: Polygala