? |
P
|
?
|
? |
Pachymorph |
Rhizome system characterized by a shortened, thick and fleshy stem and many-branched clumps and closely packed culms. |
 |
Palea |
Upper or inner of a pair bracts that subtends the floret panicle type of indeterminate branched inflorescence in which all the flowers are pedicellate (stalked) and borne by the secondary axis. |
 |
|
 |
Parallel Venation |
Numerous veins (bundles of vascular tissue) run through the blade of the leaf, serving to bring water and to collect the products of photosynthesis; in some plants, the larger veins all run the length of the blade with smaller veins branching off and interconnecting them and is called parallel venation |
 |
Parenchyma |
Brick-shaped, generally living cells, primarily for tge storage and distribution of carbohydrates |
 |
Perennial |
A plant that lives for a number of years |
 |
Pericarp |
Wall of a fertilized ovary; sometimes differentiated into distinct layers such as exocarp, mesocarp and endocarp (outer, middle and inner carps) |
 |
Permeability |
A measure of the ease of liquid penetration into bamboo tissue |
 |
Persistent |
Remaining attached even after the attainment of maturity, like the culm sheath in certain species of bamboos |
 |
Petal |
Sterile leaf-like structures in flowers that serve to attract pollinators |
 |
pH |
A measure of the amount of lime (calcium) contained in the soil; pH values of 0 to 6.5 indicate acidic conditions, a pH value of 7.0 indicates neutral conditions and pH values greater then 7.0 indicate alkaline conditions |
 |
Plantation |
A plot of land on which intensive cultivation is practised using scientific principles of managment |
 |
Plumose |
Covered with a fine, feather-like pubescence
|
 |
Powdery mass |
Silicaceous material with powder-like appearance, for the protection of young culms |
 |
Preservative |
Toxic chemicals that prevent the development and/or growth of wood destroying organisms |
 |
Pressure treatment |
Any treatment in which the preservative is forced into the wood by pressure in a closed vessel or pressure cylinder |
 |
Prophylactic treatment |
Prevention or short term protection against insect and fungal attack |
 |
Prophyll |
First leaf of a branch; a kind of sheath found at the first node of a branch or scale-like appendage |
 |
Prophyllate bud |
A bud with a prophyll |
 |
Pruning |
Removal of branches to divert nutrients for the growth of new culms and to prevent congestion |
 |
Pseudospikelet |
spikelet-like inflorescence; unlike a true spikelet, it has bracts at its base each of which bears a prophyllate bud |
 |
Pubescent |
Covered with hairs rachilla secondary axis, like the stalk of grass spikelets |
 |