UMBELLlFiiRjE. 105 



SPECIES II.— P ETROSELINUM SEGETUM. Koch. 



Plate DLXXVII. 



Reich. Ic. FL Germ, et Ilelv. Vol. XXI. Tab. 1856. 

 Billot, Fl. Gall, et Germ. Exsicc. No. 770. 

 Sison segetum, Linn. Sm. Eng. Bot. No. 228. 



Stems ascending, straight between each node, slender, finely 

 striated. Leaves all strapshaped or lanceolate in outline, pinnate ; 

 leaflets sessile, ovate, cut or serrate, with the lobes or serratures 

 mucronate ; uppermost leaves with a few pairs of linear pinnre. 

 Involucre of 2 or 3 linear subacute leaves; involucel of 3 or 4 

 short subacute leaves. Umbels very irregular, with the rays all 

 unequal, erect-ascending. Columella split about halfway down. 

 Styles erect, shorter than the stylopod. 



On hedge-banks and by road-sides and waste places. Local; 

 abundant in Kent and Essex, and other places in the South of 

 England, extending as far North as the neighbourhood of Hull. 



England. Biennial or Annual. Late Summer and Autumn. 



Root slender, fusiform, producing at first a rosette of shortly- 

 stalked leaves, spreading in a circle, with leaflets | to 1 inch long. 

 Primary stem erect, with long straight internodes, afterwards much 

 brancbed, and the branches ascending or procumbent, forming 

 acute angles with each other, 6 inches to 3 feet long, bright-s^eerf, 

 polished, resembling the stems of a rush. Stem-leaves similar to 

 the root-leaves, but smaller, most of them usually decayed by the 

 time of flowering. Umbels with the longest rays 1 to 2 inches long ; 

 umbellules with very unequal pedicels, the longest about £ inch 

 the innermost flowers subsessile. Involucre of unequal leaves, the 

 longest about half the length of the longest umbel rays ; involucel 

 about one-third of the length of the longest umbellule ray. Elowers 

 p, inch across, white ; petals sub-orbicular, nearly entire, with an 

 indexed lobe. Cremocarp ovate-ovoid, i inch long, olive, with the 

 ridges rather thick, elevated, green. Styles very inconspicuous. 

 Plant dark-green, glabrous. 



Corn Parsley. 



GENUS IX.— S ISON. Linn. 



Calyx-limb obsolete. Petals roundish-obovate, deeply notched, 

 with a small broad inflexed point in the notch. Cremocarp sub- 

 globular, laterally compressed ; columella free, bipartite ; mericarps 

 with 5 equal filiform ridges, the lateral ones marginal ; interstices 



VOL. IV. P 



