104 CLASS XX. ORDER IV. 



Serpicula. Staminate flowers — calyx 4-tooth- 

 ed : corol 4-petalled. Pistillate flowers — calyx 4- 

 parted : nut lomentose. 15.88 — verticillata (little 

 snake-weed) leaves whorled prickly serrate, w. 



Eriocaulon. Common calyx many-leaved : 

 florets many in an imbricate head : corol 3 to 6- 

 petalled : stamens higher than the germ : capsule 

 S-celled : seed 1, crowned with the corol. Central 

 flowers staminate. 6. 13 — Jiellucidum (pipe-wort) 

 stem 6 or 7-angled, stem and root pellucid, leaves 

 awl-form 5-nerved. Grows mostly under water— ^ 

 decangular e^ stem 10-angled — gnajihaloides^ culia 

 sub-compressed. 



Order IV. Tetrandria. 



BoEHMERiA. Staminate flowers — calyx 4-part- 

 ed : corol : nectary 0. Pistillate flowers — calyx 

 : corol : styles 2 : seed I, compressed. (Flow- 

 ers capitate.) 53.98 — ci//mrfnca (round-head) leaves 

 opposite glabrous. %. — lateriflora, leaves alternate 

 rough. %. 



Urtica. Staminate flowers — calyx 4-leaved : 

 corol 0: nectary central cyathiform. Pistillate flow- 

 ers — calyx 2.1eaved (2-valved :) corol : seed 1, 

 glossy. 53. 98 — dioica, (nettle) leaves opposite cor- 

 date coarse-serrate, spike-panicled, dioecious. %» 

 g, — urensi leaves opposite oval 3 to 5-nerved, 

 racemes simple. 0. g. — fiumila. leaves opposite 

 ovate, racemes 2-parted shortish sub-corymbcd. 0. 

 — proccra, leaves opposite cordate, petioles ciliate. 

 y.. — canadensis^ leaves alternate heart-ovate,aments 

 branched 2-ranked erect. %. — ivhitlowi^ (Albany 

 flax) leaves alternate heart-ovate 3-nerved, upper 

 ones opposite, panicle forked, root tuberous. 2/. 

 About 6 feet high. Discovered near Albany by 

 Mr. Charles Whitlow. 



Parietaria. Polygamous. Perfect flowers— 



