Asteraceae
Transcript of Asteraceae
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A S T E R A C E A EK E V I N J . M E J Í A , M . S c
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A S T E R A C E A E
• Porte: plantas herbáceas, excepcionalmente arbóreas, erectas, trepadoras o rastreras.
• Hojas: alternas u opuestas; simples, generalmente lobadas o dentadas
• Flores: en inflorescencias conocidas con el nombre de capítulo (pseudanto), formado por muchas o pocas flores, rara vez reducida a una flor (Echinops).
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A s t e r a c e a e f l o r
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A S T E R A C E A E• Perianto: sépalos modificados en
forma de pelos, escamas o aristas que, posteriormente conformarán el "papus" usado para la dispersión del fruto.
• Androceo: 5 estambres unidos por las anteras (sinantéreos), formando un tubo, dentro del cual corre el estilo.
• Gineceo: ovario ínfero, bicarpelar, unilocular, uniovulado, de plancentación basal, estilo simple, dividido en dos ramas lineares o lanceoladas, agudos, obtusas o truncadas, presentan en su interior papilas estigmáticas receptivas del polen, y en el exterior pelos colectores.
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A S T E R A C E A E
• Fruto: cipsela (aquenio de ovario ínfero)
• Semillas: oleaginosas, embrión recto, grande, sin endosperma, germinación epígea.
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B I O L O G Í A F L O R A L• En su gran mayoría son entomófilas
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D I S T R I B U C I Ó N Y H Á B I TATA S T E R A C E A E
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P L A N TA S D E I N T E R É S
• Lactuca sativa L. (lechuga)
• Lactuca sativa L. var. longifolia (lechuga romana)
• Helianthus annuus L. (Girasol)
• Tagetes erecta (flor de muerto)
• Chamaemelum nobile (manzanilla)
• Bellis perennis (margarita)
• Cynara scolymus (alcahofa)
• Taraxacum officinale (diente de león)
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• Lactuca sativa L. (lechuga)
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• Lactuca sativa L. var. longifolia (Lehcuga romana)
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• Helianthus annuus L. (Girasol)
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• Tagetes erecta (flor de muerto)
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• Chamaemelum nobile (manzanilla)
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• Bellis perennis (margarita)
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• Cynara scolymus (alcahofa)
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• Taraxacum officinale (diente de león)
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P u r p l e G l o b e D a h l i a
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H y b r i d a x D a h l i a
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O s t e o s p e r m u m
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