Water fern, oriental
Water net Watersilk Water weed Water weed, yellow Wattle
Webworm, fall Welwitschia Whale, sperm Wheat30 Wheel tree Whisk fern Whisk fern, fossil relatives of Whisk fern, living relatives of White pine blister rust Willow
Willow Family Window leaves, plants with Wintergreen oil, sources of
Microtus spp. and others
Euonymus alata and others
Dendroica spp. and others
Citrullus lanatus member of Phylum Oomycota,
Acacia decurrens, A. mearnsii, and others
Anaplectes spp., Hyphantoris spp., and others Hyphantria cunea Welwitschia mirabilis Physeter catodon
Trochodendron aralioides Psilotum spp.
Fenestraria spp. and others Gaultheria procumbens and others
29. Depending on the classification used, viruses may not have a scientific name. Many are named after the disease they cause; e.g., tobacco mosaic virus causes tobacco mosaic disease. One classification attempts to give them at least a Latin prefix, so that the virus for warts is Papavovirus; for smallpox, Poxvirus; for polio, Picornavirus; for measles and mumps, Paramyxovirus.
30. More than 20,000 varieties of cultivated bread wheat, which has a history dating back thousands of years, are presently recognized. The ancestry and cytology are complex and still not fully understood. The principal ancestors appear to have been Triticum monococcum (which, after mutant forms were incorporated, became known as einkorn wheat) and species of Aegilops, especially A. speltoides, with several other mutations and natural hybridizations having occurred throughout the past several thousand years. Emmer wheat has been recognized as Triticum dicoccom or T. turgidum var. dicoccum; durum wheat as T. durum or T. turgidum var. durum; Polish wheat (also known as Jerusalem rye) as T. polonicum; and common bread wheat as T. aestivum (which is believed to be have been derived from T. turgidum and a genome from Aegilops tauschii). Other taxa believed to have played a role in the development of cultivated wheat include T. longissima and T. searsii. Uncertainty as to the precise evolutionary history of wheat persists, however, and awaits further investigation.
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