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An annual plant whose seed is the only overwintering structure.



an annual plant that survives unfavorable seasons—cold or dry seasons—in seed form. Most therophytes are of Mediterranean origin and are characteristic of deserts, semideserts, and southern steppes of the northern hemisphere, where they include many Cruciferae and Papaveraceae. In the forest zone therophytes are represented mainly by field weeds, for example, cornflower, pennycress, and stork’s-bill.

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Therophyte plants completed their life cycle from seed to seed and died.
Geographic area Sites Species Medicinal species Eastern area 48 76 44 Western area 30 65 33 Middle area 1 10 1 Total 79 151 78 Table 6: Number of species in each life form for all species collected during the collection missions of Mediterranean coast of Libya during the spring and summer of 2009 and 2010 Life form Number of species % Trees 24 16 Phanerophyte (shrubs) 55 36 Chamaephyte (semi-shrubs) 11 7 Annual shrubs 4 3 Perennial forbs 24 16 Perennial grasses 17 11 Biennial forbs 2 1 Therophyte (annual forbs) 11 8 Climbers 3 2 Total 151 100 Table 7.
Hemicryptophytes life form, of temperate regions, Therophytes index arid areas and mountainous areas is Chamaephytes index.
Percent of area Number of area Life form 61 82 Therophytes 22 31 Hemicryptophytes 6 8 Helophytes 4 5 Geophytes 2 3 Phanerophytes 1.
Observation for life form pattern of the study area showed that therophytes was the largest life form class in both the plots.
Percentages of phanerophytes are higher and those of hemicryptophytes and therophytes lower in the rockhouse flora than in the Kentucky flora (Table IX).