What are Petrocrops? Example of Petroplants

Petroplants are the plants which provide liquid hydrocarbons as a substitute of liquid fuels. The hydrocarbons present in these plants can be converted to petroleum hydrocarbons. 
Petroplants  include the members Euphorbiaceae, Apocyanaceae, Urticaceae, Asclepiaceae

The oil crisis during World war II had led the Italians and the French to switch over to petroplants for petroleum production. The thick milky latex, extracted from Euphorbia abyssinica  was used in gasoline refinery. In 1970, Melvin Calvin showed the feasibility of procuring petroleum substitutes from certain specific groups of plants which are rich in hydrocarbons. Gopher plant (Euphorbia lathyris, milk bush (Euphorbia tirucalli) and milk weed(Calotrophis procera) are important petroplants. One advantage with the Euphoria plants is that they can grow even in semiarid lands and do not require irrigation and fertilizers for their growth. 
What are Petrocrops? Example of Petroplants
Certain tree species, such as Copaifea landsdorfii and  Copaifea   nultijuga are rich in oil . A single tree can give as much as 20-30 litres of oil in 2-3 hours in a single tapping. 
Villagers in India use Jatropha oil can be an efficient and environmentally clean substitute for diesel. In Philippines, bamboo tube filled ignited fruits of petroleum nut (Pittosporum) is used as a torch light. Oil of Pittosporum rosinifarum contains monoterpene hydrocarbons, pinene and myrcene

Cuphea oil (Cuphea spp), Cramble oil(Crambe abyssinica), Vernonia oil (Vernonia sp), bladderpod (Lesqurella sp), meadow foam oil (Limnanthes alba) etc, 
in the United States, a blend made of sunflower oil and diesel  called sunoil, is widely used in diesel engines. similarly, coconut oil is mixed with diesel to give a blend, called cocodisesl, for use in diesels engine. 
There are many species of Euphorbia which yield fuel oil resembling rude oil. Euphobia lathyris is an example. 
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