Sentence:  Herbaceous; leaves alternate, pinnatifid, asperate; flowers large, terminal and solitary, <WSD>vespertine</WSD>, (or expanding towards sun-set,) not deciduous or marcescent after closing, but re-opening at the usual time for several days in succession, when closed involute in a cone;.... 
Meaning of the word marked with <WSD> tags:  That opens or blooms in the evening.