therophyte


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therophyte

a herb which survives the winter, or other unfavourable conditions, in the form of seeds - one of RAUNKIAERS LIFE FORMS.
References in periodicals archive ?
Hafir: Th > Ch > Ge > He > Ph; Sebdou: Th > Ch > Ge > He, Ph; Tlemcen: Th > Ch > He > Ge, Ph; Sidi Djilali: Th > Ch > He > Ph > Ge (Th: therophytes, Ch: chamaephytes; He: hemicryptophytes; Ph: phanerophytes; Ge: geophytes).
As illustrated in Figure 1, the floral community in Tabuk region was dominated by therophytes and chamaephytes.
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.
Moreover, therophyte was the dominant life form consisting of 16 grass species (59.2%) followed by hemicrytophytes with 09 species (33.3%) and phanerophytes with 02 species (7.4%) as shown in Figure 2.
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.
Therophyte plants completed their life cycle from seed to seed and died.
This North American therophyte has a high invasive potential as has been shown in various parts of Europe (e.g.
The therophyte dominant component occurring in the Dasypyrum villosum community lead other authors (IZCO, 1977; PIRONE & al., 1997; GIGANTE & VENANZONI, 2007; BLASI & al., 2012) to classify these communities in the Taeniathero-Aegilopion geniculatae.
albopilosa Kentucky Life form Phanerophyte 39.1 51.4 16.3 Chamaephyte 1.1 2.9 1.4 Hemicryptophyte 37.9 28.6 51.2 Cryptophyte 12.6 10.0 15.3 Therophyte 9.2 7.1 15.8 Growth form Trees 19.0 26.7 7.7 Shrubs 10.0 14.0 6.8 Woody vines 7.0 4.7 2.5 Forbs(a) 40.0 20.9 61.9 Graminoids 10.0 16.3 16.8 Ferns 13.0 17.4 4.3 a Includes all herbaceous spermatophytes, except graminoids.
marina as a therophyte that thrives in gaps within the upper salt marsh associations of the Salicornietea fruticosae, (Arthrocnemion glauci) or in the associations of the Thero-Salicornietea dominated by Suaeda (Thero-Suaedion).