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(Of a capsule fruit) dehiscing through terminal fissures [obscure term].  

Used of characters that arise during the lifetime of a plant as a result of environmental (not genetic) influences. Characteristics of a person that are not ascribable to heredity. Referring to a condition which is neither congenital nor hereditary and which a person develops after birth in reaction to his or her environment. Resulting from…

Sterile male flower found with a fertile female flower as a flower pair in the inflorescence of Calamus (specialist term used in Palmae).  

Scimitar-shaped, thin and curved with pointed apex [unusual term].  

Of surface, with fine lines, as if scratched.  

Of flowers, without calyx or corolla. Without floral envelopes.  

Without a lip [obscure term].  

An aggregation of achenes [obscure term].