198 UMBELLfFER^ 



usually many, pinnatifid ; sepals slender ; petals white or red, 

 notched, often irregular, with inflexed lobe ; 4 secondary ridges^ 

 each bearing a row of prickles ; seed flat in front. 



41. Cai^calis. — Leaves pinnate; bracts few, entire or absent; 

 bracteoles many ; sepals acute or absent ; petals as in Daiicus ; 

 primary and secondary ridges With, i — 3 rows of prickles each ; seed 

 deeply grooved in front. 



42. T6rilis. — Differing from C alkalis mainly in having \.\\q fruit 

 covered with prickles between the ridges. 



ERYN'GiUM MARiTiMUM {Sea Eryngo, Sea HoHj). 



I. Hydrocotyle (Marsh Pennywort). — Small creeping herbs ; 

 leaves simple, peltate, orhicuXsiX ; flowers in simple umbels ;/r?ir// 

 roundish, flattened. (Name from the Greek liudor, water, and 

 kotule, a dish, from the shape of the leaves and place of growth.) 



I. H. vulgaris (Marsh Pennywort, White-rot). — The only 

 British species, very unlike other British Umbelliferae, with round, 

 smooth, shining, .crenate leaves^ i — i^ in. across, with hairy stalks ;' 



