POLYPETAL^— UMBELLIFER^ 



147 



the Cow-parsnip, and to a less degree in the Carrot, the flowers 

 (fig. 183) at the margin of the inflorescence are zygomorphic by 



..an 



-M 



-.Sg 



Fig. 183. — Vertical section of a marginal zygomorphic flower of 

 Herachum sphondylium, 



reason of the special enlargement of the anterior petals (ap), 

 which are directed outwards. Sepals (ex) five or none ; when 

 present the calyx is small, and is only re- /■» 



presented by five teeth ; in some Umbel- 

 liferae the calyx is absent. Petals {ap, pp), 

 five, separate, often bent inwards at their 

 tips. Stamens {an) five, epigynous, sepa- 

 rate, alternate with the petals, bent in- 

 wards in the bud. Carpels two, syncar- 

 pous, inferior ; ovary two - chambered, 

 with one ovule in each chamber ; styles 

 two, short. Disk. — The fleshy disk {d) 

 lies on the roof of the ovary chamber, 

 and the styles appear to emerge from 

 this disk. The disk is a nectary. Fruit, pj^ j8^._Fiorai diagram 



The fruit (figs. 181;, 186) is a SchizOCarp of zygomorphic flower of 



sphttmg into two one-seeded closed men- 

 carps, which remain for a time attached to the persistent 

 thin portion of the axis {cK) {carpophore) of the fruit. The 



