116 MONOCHLAMTDE^l. 



leaves ovate, a bunch of them collected at the extremities of the 

 branches, and spread out in rose-like form on the water ; stems 

 slender and hair-like ; flowers white, in the axils of the upper 

 leaves. Near Torre Abbey. Paignton osier-beds, etc. (E. B. t. 

 722.) A. iv.-ix. CallitricJie is the only genus in this Order. 



OBD. LXXIX. CEBATOPHYLLACE^. 

 CERATOPHYLLUIYI. HOENWOET. 



C. denier sum (common Hornwort.) In ditches, stagnant 

 waters, and slow streams. Stem long and slender, floating; 

 leaves in very close whorls, 2 or 3 times forked, segments linear ; 

 flowers sessile in the axils of the leaves ; fruit armed with two 

 lateral spines and crowned by the lengthened style. In the 

 Clyst, by Clyst Bridge, Fl. D. (E. B. t. 947.) P. vi. vn. This 

 Order contains only one genus. 



OED. LXXX. URTICACEJE, 

 STJBOED. I. URTICE&. 

 miTICA. NETTLE. 



1. XJ. urens (small Nettle.) In waste places and under 

 hedges, too frequent. Stem 12 or 18 inches high ; leaves oppo- 

 site, elliptical, deeply serrate, bright green, covered with minute 

 hair-like bristles ; flowers in axillary spikes. Abundant. (E. B. 

 t. 1236.) A. vi.-ix. 



2. 17. dioica (great N.) Same situations as the last. Stem 

 erect, from 2 to 3 feet high, bluntly 4- cornered, bristly ; leaves 

 opposite, stalked, heart-shaped at the base, pointed at the extre- 

 mities, sharply serrate ; but sometimes ovate-lanceolate and 

 rounded at the base, covered with stinging hairs ; flower-spikes 

 in pairs, axillary. Everywhere abundant. (E. B. t, 1750.) P. 



PARXETARIA. PELLITOEY OF THE WALL. 



F. ofHcinalis (common Pellitory.) On old walls and among 

 stony rubbish. Plant from 6 to 10 or 12 inches high, having much 



