Ticket #5843 (new)

Opened 11 days ago

Struggling With Nerve Pain? Don’t Delete This.

Reported by: "Nerve Pain" <NeuropathyTreatment@…> Owned by:
Priority: normal Milestone: 2.11
Component: none Version: 3.8.0
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Struggling With Nerve Pain? Don’t Delete This.



Distichous phyllotaxis, also called "two-ranked leaf arrangement" is a special case of either opposite or alternate leaf arrangement where the leaves on a stem are arranged in two vertical columns on opposite sides of the stem. Examples include various bulbous plants such as Boophone. It also occurs in other plant habits such as those of Gasteria or Aloe seedlings, and also in mature plants of related species such as Kumara plicatilis.

A Lithops species, showing its decussate growth in which a single pair of leaves is replaced at a time, leaving just one live active pair of leaves as the old pair withers
In an opposite pattern, if successive leaf pairs are 90 degrees apart, this habit is called decussate. It is common in members of the family Crassulaceae Decussate phyllotaxis also occurs in the Aizoaceae. In genera of the Aizoaceae, such as Lithops and Conophytum, many species have just two fully developed leaves at a time, the older pair folding back and dying off to make room for the decussately oriented new pair as the plant grows.

A decussate leaf pattern

Decussate phyllotaxis of Crassula rupestris
The whorled arrangement is fairly unusual on plants except for those with partic

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