Register ICMag Forum Menu Features Search Today's Posts Mark Forums Read
You are viewing our:
in:
Forums > Marijuana Growing > Cannabis Botany and Advanced Growing Science > Cannabis Systematics at the Levels of Family, Genus, and Species

Thread Title Search
Post Reply
Cannabis Systematics at the Levels of Family, Genus, and Species Thread Tools Search this Thread
Old 05-22-2019, 01:08 AM #1
Weird
3rd eye jedi

Weird's Avatar

Join Date: Jul 2010
Posts: 7,590
Weird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivorWeird is a survivor
Cannabis Systematics at the Levels of Family, Genus, and Species

Cannabis Systematics at the Levels of Family, Genus, and Species

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6225593/

Quote:
New concepts are reviewed in Cannabis systematics, including phylogenetics and nomenclature. The family Cannabaceae now includes Cannabis, Humulus, and eight genera formerly in the Celtidaceae. Grouping Cannabis, Humulus, and Celtis actually goes back 250 years. Print fossil of the extinct genus Dorofeevia (=Humularia) reveals that Cannabis lost a sibling perhaps 20 million years ago (mya). Cannabis print fossils are rare (n=3 worldwide), making it difficult to determine when and where she evolved. A molecular clock analysis with chloroplast DNA (cpDNA) suggests Cannabis and Humulus diverged 27.8 mya. Microfossil (fossil pollen) data point to a center of origin in the northeastern Tibetan Plateau. Fossil pollen indicates that Cannabis dispersed to Europe by 1.8–1.2 mya. Mapping pollen distribution over time suggests that European Cannabis went through repeated genetic bottlenecks, when the population shrank during range contractions. Genetic drift in this population likely initiated allopatric differences between European Cannabis sativa (cannabidiol [CBD]>Δ9-tetrahydrocannabinol [THC]) and Asian Cannabis indica (THC>CBD). DNA barcode analysis supports the separation of these taxa at a subspecies level, and recognizing the formal nomenclature of C. sativa subsp. sativa and C. sativa subsp. indica. Herbarium specimens reveal that field botanists during the 18th–20th centuries applied these names to their collections rather capriciously. This may have skewed taxonomic determinations by Vavilov and Schultes, ultimately giving rise to today's vernacular taxonomy of “Sativa” and “Indica,” which totally misaligns with formal C. sativa and C. indica. Ubiquitous interbreeding and hybridization of “Sativa” and “Indica” has rendered their distinctions almost meaningless.

Keywords: :
__________________
galatians 6:7

WWDLBD

WW1.618D

Quote:
The shape it takes could be yours to choose

What you may win, what you may lose
Sativa is manna from heaven - BLueGrassToker

Ounce of prevention is worth a pound of cured - Ureapwhatusow

nobody every told me i found out for myself, you've got to believe in foolish miracles - o. osborne

Although the masters make the rules
For the wise men and the fools
I got nothing, Ma, to live up to - b. Dylan
Weird is offline Quote


3 members found this post helpful.

Post Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT +2. The time now is 05:30 AM.




This site is for educational and entertainment purposes only.
You must be of legal age to view ICmag and participate here.
All postings are the responsibility of their authors.
Powered by: vBulletin Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.