Explore Related Concepts

Best Results From Wikipedia Yahoo Answers Youtube


From Wikipedia

Herbaceous plant

A herbaceous plant (in botanical use simply herb) is a plant that has leaves and stems that die down at the end of the growing season to the soil level. They have no persistent woody stem above ground. Herbaceous plants may be annuals, biennials or perennials.

Annual herbaceous plants die completely at the end of the growing season or when they have flowered and fruited, and they then grow again from seed.

Herbaceous perennial and biennial plants have stems that die at the end of the growing season, but parts of the plant survive under or close to the ground from season to season (for biennials, until the next growing season, when they flower and die). New growth develops from living tissues remaining on or under the ground, including roots, a caudex (a thickened portion of the stem at ground level) or various types of underground stems, such as bulbs, corms, stolons, rhizomes and tubers. Examples of herbaceous biennials include carrot, parsnip and common ragwort; herbaceous perennials include peony, hosta, mint, most ferns and most grasses. By contrast, non-herbaceous perennial plants are woody plants which have stems above ground that remain alive during the dormant season and grow shoots the next year from the above-ground parts – these include trees, shrubs and vines.

Some relatively fast-growing herbaceous plants (especially annuals) are pioneers, or early-successional species. Others form the main vegetation of many stable habitats, occurring for example in the ground layer of forests, or in naturally open habitats such as meadow, salt marsh or desert.

Some herbaceous plants can grow rather large, such as the Musagenus, to which thebanana belongs.


Aerial stem modification

Ariel stem modifications are modifications to the aerial stems, vegetative buds and floral buds of plants which perform special functions. Overview The aerial stems, vegetative buds and floral buds of plants growing in different conditions undergo modifications to perform special functions. These modifications are called "aerial stem modifications'. They include tendrils, thorns, hooks, phylloclade, tuberous stems and bulbils. Tendrils Some weak stemmed plants produce wiry, coiled, sensitive and delicate organs for climbing. They are called tendrils . These may develop from either the axillary bud or the terminal bud of the stem. In Passiflora, the tendrils develop from the axillary bud. In Cissus quadrangularis. And in Vitis vinifera the terminal bud develops into tendrils. Thorns These are hard, woody, pointed structures meant for protection. They are provided with vascular tissue, which may develop from the axillary bud or terminal buds. They control transpiration by reducing the vegetative growth. In Bougainvillae, Punica granatum and Duranta the axillary bud develop into thorns. In Duranta, the thorns are provided with leaves and flowers. In Punica granatum, the thorns bear leaves and branches. In Carissa carundus the terminal bud produces a pair of thorns. They help in protection.


From Yahoo Answers

Question:And please also give an example.

Answers:Perennials can be herbaceous and die down to their crown during their dormant period or they can be woody and retain a large exposed structure even while dormant. The function of the stems in both cases is to provide vertical space to transport water & sap via vascular tissues to the transpiring photosynthetic organs (leaves) and the reproductive organs (cones or flowers) from the foraging roots. Woody stems often have the additional function of spatial array. They have a branching pattern in order to display their leaves over as dispersed a space as possible in order to maximized their exposure to sunlight while minimizing water loss. Stems provide height and spread so plants can seek sunlight more efficiently without shading out their own lower leaves. Herbaceous or deciduous perennials that die down each year are mint, peony, hosta, iris, and most grasses. Woody herbaceous herbs are thyme, sage, rosemary and lavender. Shrubs like oleander or rhododendron, plus palms, cactus, rattan, or bamboo are all woody perennials.

Question:I've googled this question, looked it up on several websites, looked through my textbook, found nothing. All I could find is that the limit for a woody stem's growth is greater. Some people said it was photosynthesis, but don't both go through photosynthesis? & this one person said something about stem propagation..Idk.

Answers:Herbaceous stems can perform photosynthesis, they're green because they contain chloroplasts, woody plants *typically* do not, but the level of photosynthesis is pretty minimal compare to the leaves. However, the only photosynthesizing portion of cacti are the stems and cacti are herbaceous so there is that exception. Also, yes there are more cells capable of redifferentiating into meristematic cells in herbaceous stems so they do propagate more easily.

Question:

Answers:

Question:I have about 70 days to grow a woody stem plant/tree from seed in a green house. I am looking for sugestions on what to grow. The seed must have some sort of pre treatment. I am in south central ontario USDA hardiness zone 6. I would like to collect my seed from outside if posable but seed sources for purchasing them would be benifical as well.

Answers:Check out leucaena.

From Youtube

Locating Vascular Bundles In a Stem :Check us out at www.tutorvista.com In plants, assemblage of conducting tissues and associated supportive fibres. Xylem tissue transports water and dissolved minerals to the leaves, and phloem tissue conducts food from the leaves to all parts of the plant. The condition of the xylem, the woody elements in the stem, defines several categories. The protostele has a solid xylem core; the siphonostele has an open core or one filled with generalized tissue called pith. The discontinuous vascular system of monocots (eg, grasses) consists of scattered vascular bundles; the continuous vascular system of dicots (eg, roses) surrounds the central pith.

Cyborgs & Stem Cells :Eyesight is one of our most valuable senses - if it's damaged in any way it has a major impact on life. Two exciting new developments from the South West of England could make a major difference to the lives of many sight-impaired people around the world. Researchers from the University of Bristol have recently reported the first evidence of progenitor cells, also known as stem cells, in the retina. They are now looking at the conditions needed to turn them into nerve cells or photo receptor cells. If they can achieve this, then they are well on the way to controlling eye disease by helping the injured retina restore itself. And for those suffering from colour blindness, the "Eyeborg" offers a way to accurately distinguish colour. A prosthesis that enables the wearer to identify different colours by a series of sounds associated with colour frequency, the "Eyeborg" has been developed by a lecturer in cybernetics, working with an artist suffering from achromatopsia - a condition that means he can only see in black and white!