The extreme climatic conditions, overgrazing, over exploitation of plants and anthropogenic activities supported the annuals and short lived plants so the life form was dominated by therophytes followed by hemicryptophytes and chamaephytes
which are pulvinate chamaephytes
having cushion forms and spines.
1988; see also Meddour, 2010) about some Moroccan vegetation: "complex and heterogeneous vegetation structures, mainly integrating heavily anthropized degradation stages ('dematorralisation' process), in which the chamaephytes
linked to the Cisto-Lavanduletea or Rosmarinetea can play an important physiognomic role and whose interpretation is not easy".
The life form spectrum of the recorded species showed the prevalence of theorphytes (37%) followed by chamaephytes
(32%), geeophytes (13%), hemicryptophytes (10%) and Phanerophytes (8%).
We considered only the life-form categories originally proposed by Raunkiaer: phanerophytes, chamaephytes
, hemicryptophytes, cryptophytes and therophytes.
The proportions of herbaceous-subshrub/shrub-arboreal (epiphytes, succulents, chamaephytes
, hemicryptophytes, and therophytes /phanerophytes) species were calculated for each of the vegetation types, for cerrado-caatinga transition, and for the different cerrado physiognomies.
Proposed by Raunkiaer (1934), the system classifies plants according to forms used to protect their perennating buds during unfavorable seasons, and groups them into five main classes: therophytes, cryptophytes, hemicryptophytes, chamaephytes
and phanerophytes, according to their different resistance strategies to environmental conditions.
Hemicryptophytes life form, of temperate regions, Therophytes index arid areas and mountainous areas is Chamaephytes
In the investigated area cold conditions, low temperature, wind and biotic factors result in un-favorable conditions paving way for chamaephytes
Life form analysis of these two sites indicated the presence of therophytes (Th), chamaephytes
(Ch), hemicryptophytes (H), geophytes (G) and phenerophytes (Ph).
The dominant life forms were Chamaephytes
(dwarf shrubs) and Hemicryptophytes (graminoids).
The most frequent biological types in deserts and subdeserts (therophytes, many geophytes, hemicryptophytes, and some chamaephytes
) are species with passive strategies; only chamaephytes
and phanerophytes have to adopt active strategies to deal with the arid climate.