96 ENGLISH BOTANY. 



shire ; formerly also by Watling Street, near Brook Hall, where it 

 is now extinct. 



England. Perennial. Summer and Autumn. 



Rootstock elongate thickened. Stem erect or ascending, much 

 branched, 1 to 2 feet high. Radical leaves on stalks 2 to 8 inches 

 long, the lamina 3 to 8 inches across, deltoid and not decurrent in 

 the specimens I have from Plymouth, but rhomhoidal and decur- 

 rent, sometimes nearly to the base of the petiole, in those from 

 "Weston-super-Mare, pinnatifid with 4 to 6 pair of segments, each 

 pair with the decurrent portion narrowing downwards until it dis- 

 appears where the next pair of pinnae are situated ; lowest segments 

 much the largest and most deeply divided; stem-leaves smaller 

 than the radical ones, sessile, with large auricles embracing the 

 stem, which terminates in a single stalked flower-head, beneath 

 which it is trichotomously branched as in E. maritimum, but the 

 branches are more repeatedly dichotomous than in that plant, and 

 the stem itself is much more branched. Elower-heads ^ to f inch 

 across, at first globular, afterwards shortly-ovoid. Bracts of the 

 separate flowers usually entire. Calyx-segments lanceolate, abruptly 

 acuminate, with a long excurrent spinous midrib. Cremocarp ^ inch 

 long, roughened, thickly clothed with white scarious lanceolate 

 scales. Plant pale glaucous-green, glabrous. 



Field JErt/ngo. 



French, Pcmicaut des Cliamps. German, Feld Mtinnertreu. 



Tribe III.— AMMINE^. 



Cremocarp laterally compressed, often sub - didymous ; colu- 

 mella distinct, generally free ; mericarps with 5 primary ridges, 

 ridges equal, filiform, rarely winged, the lateral ones usually mar- 

 ginal, all equal. Seed flat on the inner face, or nearly so. Elowers 

 in regular compound umbels. 



GENTJS F.— CI OUT A. Linn. 



Calyx-limb of 5 deltoid-ovate teeth. Petals obovate, pbcordate, 

 with a short inflexed point coming from the notch. Cremocarp 

 smooth, sub-globular, laterally compressed, constricted at the line 

 of junction of the mericarps, so as to be didymous ; columella 

 free, bipartite; mericarps with the ridges broad and flat, nearly 

 equal, the lateral ones remote from the margin; interstices each 

 with a single vitta. Involucre none or few-leaved; involucels 

 many-leaved. 



Glabrous perennial aquatic herbs, with fistulose stems and 



