World Library  
Flag as Inappropriate
Email this Article

Rosette (botany)

Article Id: WHEBN0002779031
Reproduction Date:

Title: Rosette (botany)  
Author: World Heritage Encyclopedia
Language: English
Subject: Parsley, Nepenthes pitopangii, Rosette (design), Dandelion coffee, Cushion plant
Collection: Leaves, Plant Morphology
Publisher: World Heritage Encyclopedia

Rosette (botany)

A rosette of leaves at the base of a dandelion
Rosette of leaves of Agave americana

In botany, a rosette is a circular arrangement of leaves, with all the leaves at a similar height.

Though rosettes usually sit near the soil, their structure is an example of a modified stem.


  • Function 1
    • Protection 1.1
  • Taxonomies 2
  • Form 3
  • See also 4
  • References 5


Often, rosettes form in perennial plants whose upper foliage dies back with the remaining vegetation protecting the plant. Another form occurs when internodes along a stem are shortened, bringing the leaves closer together, as in lettuce and dandelion and some succulents.[1] (When plants such as lettuce grow too quickly, the stem lengthens instead, a condition known as bolting.) In yet other forms, the rosette persists at the base of the plant (such as the dandelion), and there is a taproot.


Part of the protective function of a rosette like the dandelion is that it is hard to pull from the ground; the leaves come away easily while the taproot is left intact.

Another kind of protection is provided by the caulescent rosette which is part of the growth form of the giant Espeletia genus in South America, which has a well-developed stem above the ground.[2] In tropical alpine environments a wide variety of plants in different plant families and different parts of the world have evolved this growth form characterized by evergreen rosettes growing above marcescent leaves. Examples where this arrangement has been confirmed to improve survival, help water balance, or protect the plant from cold injury are Espeletia schultzii and Espeletia timotensis, both from the Andes.[3][4]


Many plant families have varieties with rosette morphology; they are particularly common in Asteraceae (such as dandelions), Brassicaceae (such as cabbage), and Bromeliaceae. The fern, Blechnum fluviatile or New Zealand Water Fern (Kiwikiwi) is a rosette plant.


The rosette form is the structure, the relationship of the parts, and the variations within it, as shown in the following study from a herbarium:

  • Dryas octopetala (White Dryas, Rosaceae) has a leaf rosette of leaf blades with a short petiole, slim, egg-shaped leaves with cordate bases with clearly and regularly toothed margins, and single flowers on usually long peduncles or stalks, two to four centimetres across. The flowers have seven to nine, often even more, white egg-shaped petals. The sepals are lanceolate.[5]
  • Silene nutans (Nottingham Catchfly, Caryophyllaceae) shows ensiform-lanceolate leaves. The slightly rosette-like ground leaves are bigger and of different shape than the sparse, opposite leaves on the stem.[6] This is explained in that side shoots with greatly prolonged internodes may spring from rosettes. They have one or more flowers at their tip, like the primrose. Especially in biennial plants, the main shoot can, too, grow with prolonged internodes and even branch. It is not unusual that the leaves of the rosette and those of the shoot differ in shape.[1]

As form then, "rosette" is used to describe plants that perpetually grow as a rosette and the immature stage of plants such as some ferns.

See also


  1. ^ a b Botany online: Features of Flowering Plants - Leaves
  2. ^ shows many images
  3. ^ 6: 649-656.Plant, Cell & EnvironmentGoldstein, G. and Meinzer, F.1983. Influence of insulating dead leaves and low temperatures on water balance in an Andean giant rosette plant.
  4. ^ 11: 43-47.Biotropica (Compositae), and Andean caulescent rosette species. Espeletia schultziiSmith, Alan P.1979. Function of dead leaves in
  5. ^ Botany online: Features of flowering Plants - Rosettes - Whorls
  6. ^ Botany online: Features of flowering Plants - Rosettes - Whorls
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.