It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth within the mother plant. The formation of the seed completes the process of reproduction in seed plants (started with the development of flowers and pollination), with the embryo developed from the zygote and the seed coat from the integuments of the ovule.

Seeds have been an important development in the reproduction and spread of flowering plants, relative to more primitive plants like mosses, ferns and liverworts, which do not have seeds and use other means to propagate themselves. This can be seen by the success of seed plants (both gymnosperms and angiosperms) in dominating biological niches on land, from forests to grasslands both in hot and cold climates.

The term seed also has a general meaning that predates the above â€” anything that can be sown i.e. \"seed\" potatoes, \"seeds\" of corn or sunflower \"seeds\". In the case of sunflower and corn \"seeds\", what is sown is the seed enclosed in a shell or hull, and the potato is a tuber.

Seed structure

A typical seed includes three basic parts: (1) an embryo, (2) a supply of nutrients for the embryo, and (3) a seed coat.

The embryo is an immature plant from which a new plant will grow under proper conditions. The embryo has one cotyledon or seed leaf in monocotyledons, two cotyledons in almost all dicotyledons and two or more in gymnosperms. The radicle is the embryonic root. The plumule is the embryonic shoot. The embryonic stem above the point of attachment of the cotyledon(s) is the epicotyl. The embryonic stem below the point of attachment is the hypocotyl.

Within the seed, there usually is a store of nutrients for the seedling that will grow from the embryo. The form of the stored nutrition varies depending on the kind of plant. In angiosperms, the stored food begins as a tissue called the endosperm, which is derived from the parent plant via double fertilization. The usually triploid endosperm is rich in oil or starch and protein. In gymnosperms, such as conifers, the food storage tissue is part of the female gametophyte, a haploid tissue. In some species, the embryo is embedded in the endosperm or female gametophyte, which the seedling will use upon germination. In others, the endosperm is absorbed by the embryo as the latter grows within the developing seed, and the cotyledons of the embryo become filled with this stored food. At maturity, seeds of these species have no endosperm and are termed exalbuminous seeds. Some exalbuminous seeds are bean, pea, oak, walnut, squash, sunflower, and radish. Seeds with an endosperm at maturity are termed albuminous seeds. Most monocots (e.g. grasses and palms) and many dicots (e.g. brazil nut and castor bean) have albuminous seeds. All gymnosperm seeds are albuminous.

Read more at Wikipedia.org





	* FRENCH LILAC SYRINGA VULGARIS *GREAT BONSAI! 10 SEEDS US $1.59	* HELICONIA NIGRAEFIXA * EXOTIC!! SEEDS US $1.59

	mint, MOUNTAIN MINT WILD, shade or sun 350 seeds! GroCo US $1.47	NEW Chia Pet Gourmet Herb Garden Spices dill cilantro US $9.99

	* MUSA SIKKIMENSIS BANANA PALM * COLD HARDY!! SEEDS US $1.49	MY CHOCOLATE MINT SEEDS ARE READY FOR YOU! US $2.99

	* PASSION FLOWER QUADRANGULARIS GRENADILLA * SEEDS US $1.39	CHIVE SEEDS - FREE SHIPPING US $2.50

	Organic Culinary Herb Seeds 500 for1.00 Many Types US $1.00	1 ounce WILD WOODSGROWN American Ginseng Seeds US $9.99

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	cilantro, CORIANDER, CHINESE PARSLEY, 355 SEEDS! GroCo US $1.27	5 LBS STRATIFIED AMERICAN GINSENG SEEDS US $229.00

	* COLUMBINE CHOCOLATE SOLDIER * SCENTED!! SEEDS US $1.79	Organic White Sacred Sage Seeds~ Many Medical Uses. US $1.99

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	* HELICONIA MIX * EXOTIC!! 10 SEEDS US $1.79	* HELICONIA PSITTACORUM-PARROT'S BEAK * SEEDS US $1.59

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	100 Catnip Seeds Picked Fresh (see Hommade Catnp Toy) US $1.99	Rosemary 100 Seeds -"MUST HAVE" herb! US $3.99

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	* ORGANIC WHEAT GRASS FOR YOU OR YOUR CAT * 500 SEEDS US $3.00	Cilantro also known as Corriander 100 seeds US $1.99

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	HERB SEEDS: MARJORAM - Excellent Garnish, Like Oregano US $1.97	LEMON CATNIPFOR YOUR PAMPERED PUSSY**30 SEEDS US $1.50

	NEWLIME BASILSO TASTY AND DIFFERENT30 SEEDS US $1.50	NEWSWEET MACE COLOURFUL AROMATIC HERB**30 SEEDS US $1.50

	* RUDBECKIA CHERRY BRANDY * SEEDS US $2.99	HERB SEEDS: CARAWAY - Ideal For Meats, Colesaw, Salads US $1.97

	HERB SEEDS: SORRELL Excellent All Purpose Seasoning US $1.97	HERB SEEDS: ANISE - Great For Pasta Sauces, Breads US $1.97

	HERB SEEDS: BORAGE - Ideal For Soups, Tea & Salads US $1.97	HERB SEEDS: THYME - Excellent All Purpose Seasoning US $1.97

	HERB SEEDS: DILL- Ideal For Pickling,Meats,Vegetables US $1.97	HERB SEEDS: CHIVES - Ideal For Meats and Vegetables US $1.97

	HERB SEEDS: CHAMOMILLE - Perfect For Tea, Apple Scent US $1.97	HERB SEEDS: CATNIP - Excellent Treat 4 Kitty! US $1.97

	HERB SEEDS: OREGANO - Pasta Sauces, Pizza, Soups US $1.97	HERB SEEDS: FENNEL - Bulb Can Be Cooked And Eaten US $1.97

	HERB SEEDS: WATERCRESS/Peppegrass - Green garnish US $1.97	HERB SEEDS: CORIANDER - Broad Range Of Cooking Uses US $1.97

	HERB SEEDS: SWEET BASIL - Ideal For Fish, Sauces, Salad US $1.97	HERB SEEDS: SUMMER SAVORY- All Purpose Seasoning US $1.97

	HERB SEEDS: SAGE - Ideal For Meat, Sauces, Stuffing US $2.17	HERB SEEDS: LEMON BALM - Ideal For Teas, Headaches US $1.97

	HERB SEEDS: CHERVIL- Parsley-type Flavor, Sauces/Soups US $1.97	HERB SEEDS: LAVENDER - Potpourri, Oils, Fragrant US $2.27

	HERB SEEDS: ROSEMARY - Ideal For Meats, Garnish US $2.27	SPEARMINT SEEDS - MINT HERB - FREE SHIPPING US $2.50

	NEWGREEK OREGANOGREAT ALL ROUND HERB30 SEEDS US $1.50	Discount Items Tobacco Seeds Seed Grow Smoke Tax Free US $18.85

	Aerogarden International Basil Seed Kit US $5.51	Wild Dagga SEED Leonotis leonorus - Lions Tail US $1.00

	ROCKET ARUGULA SEEDS - HERB - FREE SHIPPING US $2.50

Click to see more Seeds items Prices current as of last update, 01/08/09 4:31pm.

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