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Panicle

(PAN-ih-kul) A branching raceme.

Last Updated: 01-26-2008 @ 04:54 PM  Submitted By: Oscarman

Peduncle

(PEE-dung-kol) The basal stalk of an inflorescence.

Last Updated: 06-28-2006 @ 12:14 PM  Submitted By: Oscarman

Peloric

A term used to describe an unusual condition where all three petals (instead of just one) have developed to mimic the labellum in shape and/or color. Coined by Darwin to describe a mutant flower that has many planes of reflectional symmetry.

Last Updated: 06-28-2006 @ 10:46 AM  Submitted By: Oscarman

Perianth

(PEAR-ee-anth) The sterile parts of a flower; collectively, the sepals and petals

Last Updated: 07-06-2010 @ 12:52 AM  Submitted By: Oscarman

Petal

The whorl of flower parts just inside the sepals, usually colorful. The median petal of orchids, the labellum, is often differentiated in form and/or function. http://www.orchidboard.com/community/gallery/data/506/medium/Part_of_Flower.jpg][/url]

Last Updated: 07-23-2015 @ 11:56 PM  Submitted By: Oscarman

Photoperiod

(pho-toe-peer-i-od) The interval in a 24-hour period during which a plant (or animal) is exposed to light.

Last Updated: 06-21-2014 @ 02:35 PM  Submitted By: Oscarman

Photosynthesis

The process in green plants and certain other organisms by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source. Most forms of photosynthesis release oxygen as a byproduct.

Last Updated: 04-27-2006 @ 11:09 PM  Submitted By: Oscarman

Phototropism

Phototropism is a growth movement induced by a light stimulus. Growth towards a source of light is called positive phototropism, that away from the source is termed negative phototropism. The tips of shoots are usually positively, that of roots negatively phototropic.

Last Updated: 07-20-2006 @ 10:47 PM  Submitted By: Oscarman

Pilose

Covered with hair, especially soft fine hair; furry.

Last Updated: 01-31-2013 @ 01:52 AM  Submitted By: Oscarman

Pod

See Capsule.

Last Updated: 05-08-2006 @ 11:48 PM  Submitted By: Oscarman

Pollinarium

A functional unit in orchid pollination, consisting of two or more pollinia, stalk or stipe, and viscidium.

Last Updated: 04-27-2006 @ 11:10 PM  Submitted By: Oscarman

Pollinium

(pol-LIN-ee-um) pl. pollinia A compact mass of pollen grains. Often yellow, distinct, and found under the anther cap of the column.

Last Updated: 04-27-2006 @ 11:11 PM  Submitted By: Oscarman

Polyploidy

The state where all cells have multiple pairs of chromosomes beyond the basic set.

Last Updated: 04-27-2006 @ 11:11 PM  Submitted By: Oscarman

Primary Hybrid

The progeny which result from a cross between two species.

Last Updated: 08-01-2006 @ 09:35 PM  Submitted By: Oscarman

Proliferation

A tendency for protocorms to grow into a mass of relatively unorganized plant tissue rather than develop into individual plantlets.

Last Updated: 04-27-2006 @ 11:12 PM  Submitted By: Oscarman

Protocorm

A swollen tuber-like structure that is the first stage of growth after an orchid seed germinates.

Last Updated: 04-27-2006 @ 11:12 PM  Submitted By: Oscarman

Pseudobulb

(SOO-doh-buhlb) - a false bulb. Thickened or bulb-like stems produced by some sympodial orchids to store water and food. Most often topped with one or two leaves. Characteristic of orchids whose habitat has seasonal periods of dryness or drought.

Last Updated: 05-08-2006 @ 11:49 PM  Submitted By: Oscarman

Pubescent

Covered with fine hairs.

Last Updated: 04-27-2006 @ 11:13 PM  Submitted By: Oscarman