John David Axtell (February 5, 1934 – December 2, 2000) was an American geneticist, Lynn Distinguished Professor of Agronomy, member of the National Academy of Sciences.
 Axtell received the Alexander von Humboldt Award in 1975, the Crop Science Research Award from the Crop Science Society of America in 1976, and the International Award for Distinguished Service to Agriculture in 1984.
 Axtell was widely noted for his research on sorghum(Sorghum bicolor L.). "
The New York Times" and other sources reported that Axtell had been one of discoverers of high-lysine sorghum, and that the discovery was crucial to the fight against world hunger.
This article is a list of diseases of sorghum ("Sorghum bicolor").
Herbaspirillum rubrisubalbicans is a nitrogen-fixing bacterium of the genus "Herbaspirillum" found in roots and stems of sugarcane ("Saccharum officinarum"), sorghum ("Sorghum bicolor"), and rice ("Oryza sativa").
 "H. rubrisubalbicans" can cause symptoms of the mottled stripe disease in sugarcane and sorghum.
 Leaves inoculated with "H. rubrisubalbicans" show red stripes along the secondary veins of the leaf blade.
Striga hermonthica, commonly known as purple witchweed or giant witchweed, is a hemiparasitic plant that belongs to the family Orobanchaceae.
 It is devastating to major crops such as sorghum ("Sorghum bicolor") and rice ("Oryza sativa").
 In sub-Saharan Africa, apart from sorghum and rice, it also infests maize ("Zea mays"), pearl millet ("Pennisetum glaucum"), and sugar cane ("Saccharum officinarum").
Dhurrin is a cyanogenic glycoside produced in many plants.
 Discovered in multiple sorghum varieties in 1906 as the culprit of cattle poisoning by hydrogen cyanide, dhurrin is most typically associated with "Sorghum bicolor", the organism used for mapping the biosynthesis of dhurrin from tyrosine.
 Dhurrin's name is derived form the Arabic word for sorghum, transliterated to "Dhura."
Sweet sorghum is any of the many varieties of the sorghum grass whose stalks have a high sugar content.
 Sweet sorghum thrives better under drier and warmer conditions than many other crops and is grown primarily for forage, silage, and syrup production.
 Although, in most of the United States the term "molasses" refers to a sweet syrup, made as a byproduct of sugarcane or sugar beet sugar extraction, sweet sorghum syrup is known as "sorghum molasses" in some regions of the U.S
Vigna umbellata (Thunb.)
 Ohwi and Ohashi, previously "Phaseolus calcaratus", is a warm-season annual vine legume with yellow flowers and small edible beans.
 It is commonly called ricebean or rice bean.
 To date, it is little known, little researched and little exploited.
 It is regarded as a minor food and fodder crop and is often grown as intercrop or mixed crop with maize ("Zea mays"), sorghum ("Sorghum bicolor") or cowpea ("V. unguiculata"), as well as a sole crop in the uplands, on a very limited area.
 Like the other Asiatic "Vigna" species, ricebean is a fairly short-lived warm-season annual.
 Grown mainly as a dried pulse, it is also important as a fodder, a green manure and a vegetable.
 Ricebean is most widely grown as an intercrop, particularly of maize, throughout Indo-China and extending into southern China, India, Nepal and Bangladesh.
 In the past it was widely grown as lowland crop on residual soil water after the harvest of long-season rice, but it has been displaced to a great extent where shorter duration rice varieties are grown.
 Ricebean grows well on a range of soils.
 It establishes rapidly and has the potential to produce large amounts of nutritious animal fodder and high quality grain.
Sporisorium sorghi is a species of fungus in the Ustilaginaceae family.
 It is a plant pathogen, causing covered smut of "sorghum" spp.
 such as "Sorghum bicolor" ("S. vulgare") (sorghum), "S. sudanense" (Sudan grass), "S. halepense" (Johnson grass) and "Sorghum" "vulgare" var.
 "technichum" (broomcorn).
Sorghum (Sorghum bicolor) comes from the Latin name “Syrucum (granum)” which means “grain of Syria” however it originated in eastern Africa.
 Sorghum is an important species of the grass family, Paceae, and is considered the world’s fifth most important cereal crop.
 There are many diverse and wild types of Sorghum, however there are seven basic races, the most common in Asia are Durra and Sballu.
 Sorghum is an important staple crop for more than 500 million people in sub-Saharan Africa and South Asia, including many people in Nepal.
 Sorghum is grown on more than 48 ha area around the world.
 In statistics collected from 1992-1994 about general millet, Nepal had an area of 0.21 million ha, with a yield rate of 1.14 (t/ha), and produced around 0.24 million tons of Sorghum.
 The entirety of the crop is highly valued, both the grain and the stem are very useful.
 Sorghum can be cooked in many different ways for food with a high nutritional content, among many other uses.
 Overall Sorghum is a very important crop worldwide.
Sorghum bicolor, commonly called sorghum ( ) and also known as great millet, durra, jowari, or milo, is a grass species cultivated for its grain, which is used for food, both for animals and humans, and for ethanol production.
 Sorghum originated in northern Africa, and is now cultivated widely in tropical and subtropical regions.
 Sorghum is the world's fifth most important cereal crop after rice, wheat, maize and barley.
 "S. bicolor" is typically an annual, but some cultivars are perennial.
 It grows in clumps that may reach over 4 m high.
 The grain is small, ranging from 2 to 4 mm in diameter.
 Sweet sorghums are sorghum cultivars that are primarily grown for foliage, syrup production, and ethanol; they are taller than those grown for grain.

Question: What tpe of vegetation does Sorghum bicolor and Sweet sorghum have in common?
Answer: grass