Question: Which is a genus of tree, Zigadenus or Taxus?
Context: Taxus contorta commonly known as the west Himalayan yew is a species of tree in the genus "Taxus".  It lives in temperate forests of Afghanistan Northern India, Tibet and Pakistan. Torreya grandis ((pinyin=Xiāngfěi) is a species of conifer in either the family Taxaceae, or Cephalotaxaceae.  "T. grandis" is a large tree that can attain height of 25 m , and possibly as high as 39 m .  "T. grandis" is endemic to eastern and south-eastern China; it is found in the coastal provinces Fujian, Zhejiang, and Jiangsu, as well as in Anhui, Guizhou, Hunan, and Jiangxi inland.  Its natural habitat are mountains and open valleys, often by streams, between 200 - ASL.  One common name is Chinese nutmeg yew (although it is not related to nutmeg, and the true yews belong to the genus "Taxus"), which refers to its edible seeds that superficially resemble nutmeg () and its yew-like foliage.  The seeds can be pressed for oil.  The wood is used in construction and furniture.  "T. grandis" is used as an ornamental tree in Europe and North America. Caesarsboom (Caesar's Tree) is a very old tree whose precise age is unknown but is believed to be over 2000 years in age.  The ancient tree grows in Lo, a town in Lo-Reninge, a municipality of the province of West-Vlaanderen of Belgium.  Its species is "Taxus baccata", common name European Yew.  The tree is designated a national monument of Belgium. Melanthieae is a tribe of flowering plants within the family Melanthiaceae.  Molecular phylogenetic studies in the 21st century have resulted in a large-scale reassignment of many of its species to different genera; in particular the genus "Zigadenus" (deathcamases) has been restricted to a single species, "Zigadenus glaberrimus".  Plants contain alkaloids, making them unpalatable to grazing animals; many are very poisonous to both animals and humans. Taxus celebica is a large, evergreen shrub or tree of the yew family (Taxaceae), widespread in China at elevations up to 900 meters (3,000 feet).  It is commonly called Chinese yew though the term also refers to the "Taxus chinensis" or "Taxus sumatrana". Taxus cuspidata, the Japanese yew or spreading yew, is a member of the genus "Taxus", native to Japan, Korea, northeast China and the extreme southeast of Russia. Koca Porsuk, is a 4,112-years-old yew tree (Taxus baccata) growing high in Zonguldak district of Black Sea Region, in Turkey.  It is 3rd oldest tree living in the world. Zigadenus is a genus of flowering plants now containing only one species, Zigadenus glaberrimus, the sandbog death camas, found in the southeastern United States from Mississippi to Virginia.  Around 20 species were formerly included in the genus, but have now been moved to other genera. Taxus is a genus of small coniferous trees or shrubs in the yew family Taxaceae.  They are relatively slow-growing and can be very long-lived, and reach heights of 2.5 – , with trunk girth averaging 5 m .  They have reddish bark, lanceolate, flat, dark-green leaves 10 – long and 2 – broad, arranged spirally on the stem, but with the leaf bases twisted to align the leaves in two flat rows either side of the stem. Anticlea is a genus of flowering plants in the family Melanthiaceae, tribe Melanthieae.  Molecular phylogenetic studies in the 21st century have resulted in number of changes to placements within this tribe.  "Anticlea" was long submerged into the genus "Zigadenus"; however its separate position has been confirmed.  Some species were also moved from "Stenanthium" into "Anticlea".  (See also Phylogeny of Melanthieae.)  Members of "Anticlea" may also be distinguished from other members of the former genus "Zigadenus", the deathcamases, by the presence of narrow tepals with a single, conspicuous, bilobed gland.  It also has a wider distribution, occurring in Asia and much of North and Central America, ranging south to Guatemala.
Answer: Taxus