Fort Towson

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This article was the subject of a Wiki Education Foundation-supported course assignment, between 11 January 2021 and 7 April 2021. Further details are available on the course page. Student editor(s): AdamBiolGuy123.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 20:59, 16 January 2022 (UTC)[reply]

I'm amazed that Welwitschia is mentioned in the introduction. The information is technically correct, but this is a single species with limited distribution, so maybe doesn't warrant this level of attention? Cfs14 (talk) 18:30, 14 February 2010 (UTC)[reply]

I have corrected the misconception that leaves on evergreen trees always persist for at least a year. The section on reasons for being evergreen is missing some information, although the material there is largely correct.Cfs14 22:23, 11 June 2007 (UTC)[reply]

Somebody should add to the explanation of why they are evergreens. Do they just rely on photosynthesis less than other plants, so they can get nutrients from the ground when it is too cold and dark for it? Then why are they "ever green"? wouldn't they have fewer chloroplasts?

Some sources that confirm both ends of the months-to-decades range of the "leaf life span (LLS)" of evergreens, as it's called in botany ---

• Leaves, Primary Plant Body, Leaf Anatomy section:
  

"Life Expectancy

Deciduous < 1 year

Evergreen > 1 year (usually < 5 years)"

Botany online - The Internet Hypertextbook

International Edition - Contents

http://www.biologie.uni-hamburg.de/b-online/library/plant_physiology/leaves.html

• In Abstract section: "While many evergreen herbs have a leaf longevity of more than 1 year, some species have leaf longevities shorter than 1 year. The latter species have leaf flushes in spring (summer leaves) and in autumn (winter leaves) and maintain their shoots as evergreen. Such leaf phenology has been termed as dimorphic (Givnish, 1987), heteroptic (Uemura, 1994), or evergreen shoot with deciduous leaves (Yoshie, 1995)."

In Materials and Methods, Species section: "Viola hondoensis (Violaceae) is one of the species that have evergreen shoots with a short-lived leaf. It is generally found in the understory of deciduous temperate forests in Japan and Korea. Its summer leaves are produced in spring and shed in autumn, whereas winter leaves are produced in autumn and shed in spring (Mishio, 1995)."

"Why does Viola hondoensis (Violaceae) shed its winter leaves in spring?"

Kouki Hikosaka, Yoshie Kawauchi and Takahide Kurosawa

American Journal of Botany

Published online: 15 November 2010

Printed: December 2010 vol. 97, no. 12, 1944-1950

DOI: 10.3732/ajb.1000045

http://www.amjbot.org/content/97/12/1944.full?sid=4ec3da60-dbae-4702-93d7-880b1e725ba2

• In Abstract section: "The mean leaf life span determined for Araucaria araucana (24 years) is among the highest figures reported for any plant species."

In Results, Leaf life spans section: "Mean leaf life spans ranged from ca. 3 years in Podocarpus saligna to ca. 24 years in Araucaria araucana (Table 1). Leaf life span of A. araucana was significantly influenced by light environment, the mean for shaded individuals being > 20 % higher than that for well-lit trees (Student t-test, P = 0.01, Table 1)."

"Leaf life spans of some conifers of the temperate forests of South America"

Christopher H. Lusk

Revista Chilena De Historia Natural, vol. 74, no. 3, 2001

http://rchn.biologiachile.cl/pdfs/2001/3/Lusk_2001.pdf

• The Majestic Basin and Range..., Did You Know? section: "Many of Great Basin National Park's bristlecone pines were growing at the time the Egyptians were building the pyramids. Not only are the trees themselves old, but the needles alone ::can be 25-40 yrs old!"

Great Basin National Park, National Park Service

http://www.nps.gov/grba/index.htm

All the best, Wordreader (talk) 04:59, 31 August 2013 (UTC)[reply]

In cool temperate climates, fewer plants are evergreen, with a predominance of conifers, as few evergreen broadleaf plants can tolerate severe cold below about -25 °C. Ufwuct 23:21, 8 January 2007 (UTC)[reply]

This is still here 15 years later, and also disagrees with the conifer article that states that most [conifers] are evergreen. I would suggest removing "fewer plants are evergreen" and saying "In cool temperate climates there is a predominance of conifers ... ". 81.6.40.151 (talk) 12:33, 14 February 2023 (UTC)[reply]

But that isn't true either. In many temperate climates decidious trees are more common. 83.54.227.133 (talk) 15:16, 16 December 2023 (UTC)[reply]

I have never seen an evergreen tree with no needles/leaves, but this sentence in the first paragraph implies that that is how it works in general with evergreen trees.

Hello! The edits I made for this article were mostly copy edits but with a few substantive edits. There were quite a few grammatical errors that I corrected, but the majority of the issues came with sentence structure. Either the sentence did not make sense, or the information in the sentence was not relevant. — Preceding unsigned comment added by Marisajm (talk • contribs) 17:48, 18 October 2020 (UTC)[reply]