P. pseudoginseng Wall. A very rare 30-60 cm tall erect herb distributed in the interior temperate mountainous regions of Sikkim,  Bhutan, Nepal and China, recorded in the Western Himalayas from Pithoragarh district in Uttar Pradesh.

L. syn. A. barbadensis Mill. is a perennial, herbaceous and succulent species which belongs to the family Liliaceae. It is a short-stemmed plant bearing fleshy, mucilaginous leaves. The margin of the leaves becomes spiny with maturity. The plant is a native to the Mediterranean region chiefly to the warm dry areas of South and tropical <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /?>Africa and is widely adopted in  other tropical countries. The leaves contain the purgative aloin and its use in folk medicine as embalming for skin and other disorders goes back over thousands of years (Gjerstad and Riner 1968).

Biomass contributes a significant share of global primary energy consumption and its importance is likely to increase in future world energy scenarios. Current  biomass use, although not sustainable in some cases, replaces fossil fuel consumption and results in avoided CO₂ emissions, representing about 2.7 to 8.8 % of 1998 anthropogenic CO₂ emissions. Improved conversion efficiencies, besides a suitable management of biomass resources , could contribute significantly to reduce it unsustainable use, contribute a larger share of final energy demand and lead to a higher rate of fossil fuel substitution per unit of biomass energy.

An increasing population explosion and rapid industrialization is causing rapid destruction of forests. Nature crude is resulting in green house gas emissions causing population problems.

Renewable energy sources provide answer to both of these problems by way of providing clean fuel on renewable basis utilizing the solar energy.

However, there is always a competition between food vs fuel use of oils and any major thrust on biofuel production must take in to account that edible oils are not diverted to the production of biofuels.

The non articulated laticifer cell present in C.procera (Asclepiadaceae) are distributed in cortex , phloem region, pith and among parenchyma cells present in the stem. The transverse and longitudinal sections of the plants treated with plant growth regulators gave varying distribution of non articulated cells. Treatment with all growth regulators i.e.