Alternate leaves originate from different points along the stem/branch:
In some cases they are widely spaced, in other cases, such as the 'leaves' of Lycopodium
, they are arranged in dense spirals:
Plants without leaves: some plants are devoid of well-developed leaves, the photosynthetic function being carried out by modified stems:
Among them are the horsetails (genus Equisetum
), in which the leaves are reduced to membranous sheaths...:
...the opuntias, with leaves transformed into acicles...
...the species of Ephedra
, with leaves transformed into short, inconspicuous sheaths...
...and several parasitic or saprophytic species which do not need true leaves since they are devoid of chlorophyll, such as those of the genus Cuscuta