ארכיון יומן של אוגוסט 2020

אוגוסט 26, 2020

Notes on Tree Morphology: “The Difference Between a Simple and Compound Tree Leaf” by Steve Nix

Web link: https://www.thoughtco.com/simple-and-compound-tree-leaf-4051112

Shape of individual leaf – Compound Leaves

As suggested earlier in Notes on Taxonomy of Trees, “trees of the genus have the same basic flower structure and may resemble other genus members in outward appearance. Tree members within a genus can still vary significantly in leaf shape, style of fruit, the color of bark and tree form.”

There are three types of compound leaves: pinnately, double pinnately, and palmately.

Pinnately Compound - The term pinnation, when talking about a tree's leaf, refers to how multi-divided leaflets arise from both sides of a common axis, or rachis. There are three types of pinnate leaflet arrangement:

• Even-pinnate leaflet arrangement: rachis divisions on pinnately compound leaves in which leaflets sprout in pairs along the rachis without a single terminal leaflet. Also called "paripinnate."

• Odd-pinnate leaflet arrangement: rachis divisions on pinnately compound leaves in which there is a single terminal leaflet at the top of the structure rather than a terminal pair of leaflets. Also called "imparipinnate."

• Alternate-pinnatel leaflet arrangement: rachis divisions on pinnately compound leaves in which leaflets sprout alternately along the rachis, usually with a single terminal leaflet. It is also called "aternipinnada."

Double Pinnately Compound - This compound leaf arrangement has several names, including bi-pinnate, double pinnate, and twice pinnate. In this case, leaflets are arranged on what are actually secondary stems, which grow off a main stem, or rachis.

Palmately Compound - The palmately compound leaf is easy to recognize because it looks like a palm frond, with its distinctive hand-and-finger shape.

פורסם ב אוגוסט 26, 2020 07:39 לפנה"צ על־ידי lunababy22 lunababy22 | 0 comments | הוספת תגובה

Notes on Taxonomy of Trees – “Tree Species Taxonomy” by Steve Nix

Web link: https://www.thoughtco.com/tree-species-taxonomy-1342627

Tree species and their names are a product of a two-part plant naming system that was introduced and promoted by Carolus Linnaeus in 1753.

The problem before the use of this taxonomic Linnaean tree classification system was the confusion surrounding the use, or misuse, of common names. ……
(American) Sweetgum, for example, the scientific name - Liquidambar styraciflua, has several common names including redgum, sapgum, starleaf-gum, gum maple, alligator-wood, and bilsted.

Linnaeus' grand achievement was the development of what is now called "binomial nomenclature" - a formal system of naming species of living things, including trees, by giving each tree a name composed of two parts called the GENUS and the SPECIES. These names are based on never-to-change Latin words. So Latin terms, when broken into their respective tree genus and species, are called a tree's scientific name. When using that special name, a tree can be identified by botanists and foresters around the world and in any language.

What does "genus" of tree mean? Genus [plural: Genera] refers to the lowest classification of a tree before determining the related species. Trees of the genus have the same basic flower structure and may resemble other genus members in outward appearance. Tree members within a genus can still vary significantly in leaf shape, style of fruit, the color of bark and tree form.

Trees of the same species have the same characteristics of bark, leaf, flower, and seed and present the same general appearance. The word species is both singular and plural.

The Hawthorn tree, genus Crataegus, leads the tree genera with the longest list of species - 165. Crataegus is also the most complicated tree to identify down to the species level.

The oak tree or genus Quercus is the most common forest tree with the greatest number of species. Oaks have some 60 related species and are native to nearly every state or province in North America.

פורסם ב אוגוסט 26, 2020 06:11 לפנה"צ על־ידי lunababy22 lunababy22 | 0 comments | הוספת תגובה

אוגוסט 29, 2020

13 Plants Observations (as at August 2020)

  1. Plantain [Musa x Paradisiaca] < Banana [Musa] < Banana [Musaceae] < Gingers, Bananas, and Allies [Zingiberales] < Monocots [Liliospsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]
  2. Papaya [Carica papaya] < Papaya [Carica < Caricaceae] < Mustards, Capers, and Allies [Brassicales] < Dicots [Magnoliopsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]
  3. Tropical Sundew [Drosera burmanni < Thelocalyx < Drosera] < Sundews [Drosera] < Sundew [Dorseraceae]
  4. Flamingo Feather Flower [Celosia spicata < Celosia < Amaranthoideae] < Amaranths [Amaranthaceae]
    < Pinks, Cactuses, and Allies [Caryophyllales] < Dicots [Magnoliopsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]

  5. Billygoat Weed [Ageratum conyzoides] < [Ageratum < Ageratinae] < Bonesets, Blazingstars, and Allies [Eupatorieae < Asteroideae (菊亞科)]
  6. Black-Jack [Bidens pilosa] < Bur Marigolds [Bidens] < Coreopsis and Allies [Coreosideae < Asteroideae (菊亞科)]
  7. False Daisy [Eclipta prostrata < Eclipta < Ecliptinae] < Sunflowers and Allies [Heliantheae < Asteroideae (菊亞科)]
  8. Oriental False Hawksbeard [Youngia japonica < Youngia < Crepidinae < Cichorieae] < Chicories, Dandelions, and Allies [Cichorioideae]
    < Sunflowers, Daisies, Asters and Allies [Asteraceae] < Asters, Bellflowers, Fanflowers and Allies [Asterales] < Dicots [Magnoliopsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]

  9. Madagascar Periwinkle [Catharanthus roseus] < Periwinkle [Catharanthus < Catharanthinae < Vinceae < Rauvolfioideae] < Dogbane [Apocynaceae] < Gentians, Dogbanes, Madders, and Allies [Gentianales] < Dicots [Magnoliopsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]
  10. African Coromandel [Asystasia gangetica ssp. Micrantha] < Coromandel [Asystasia gangetica < Asystasia] < Acanthus [Acanthaceae]
  11. Creeping Lantana [Lantana montevidensis] < Lantana [Lantana < Lananeae] < Verbena [Verbenaceae]
    < Mints, Plantains, Olives, and Allies [Lamiales] < Dicots [Magnoliopsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]

  12. Largeflower Pink-Sorrel [Oxalis debilis < lonoxalis < Oxallis]
  13. Creeping Woodsorrel [Oxalis corniculata < Corniculatae < Oxalis]
    < Woodsorrels [Oxalis] < Woodsorrels [Oxalidaceae] < Woodsorrels, Quandongs, and Allies [Oxalidales] < Dicots [Magnoliopsida] < Flowering Plants [Angiospermae] < Vascular Plants [Tracheophyta] < Plants [Plantae]

פורסם ב אוגוסט 29, 2020 10:29 לפנה"צ על־ידי lunababy22 lunababy22 | 13 תצפיות | 0 comments | הוספת תגובה