4 MONANDRIA— MONOGYNIA. Zostera. 



Nat. Ord. Inundatoe. Linn. 15. Naiades. Juss. 6. Akin 

 to Haloragece. Br. Terr. Austr. 17. Very doubtful. 

 « Most akin to Myriophi/llum, and CallitriclieP Br. 



C«Z. a border, scarcely discernible, crowning the osdS. germen. 

 Cor. none. Filam. superior, produced as the anther 

 ripens. Anth. of 2 round lobes ; at first sessile. Style 

 awl-shaped. Stigma simple, acute. Seed oval. 



Aquatic herbs. Ste7n simple, hollow. Leaves whorled. Fl. 

 axillary, sessile, naked. 



1. H. vulgaris. Common Maie's-tail. 

 Leaves linear, many in each whorl. 



H. vulgaris. Linn. Sp. PL 6. Willd. v. 1. 26. Vahl Enum. v. 1. 13. 



Fl. Br. 4. Engl. Bot. v.M.t. 763. Curt. Lond.fasc. 4. t. I. 



Hook. Scot. 2. FLDan.t.87. Bull. Fr.t. 36b. Poit.etTurp. 



Par. \.t. 1 . 

 Limnopeuce. Rail Syn. 136. 

 L. n. 1572. Hall. Hist. v. 2. 264. 

 Cauda equina fcemina. Ger. Em. 1114./. 

 Polygonum fcemina. Camer. Epit. 689. f. 

 Equisetum palustre, linariae scoparise folio. Bauh. Pin. 15. Prodr. 



24. Dill, in Rail Syn. 136. 



In ditcheSj pools, and the borders of slow streams. 



Perennial. May, June. 



Root creeping. Stem a foot, or more, above the water, round, 

 juicy, polished, reddish, with many whorls of spreading, linear, 

 entire, smooth, single-ribbed leaves. Fl,. small. Anth. red be- 

 fore it bursts. 



The lower leaves, deep under water, are long, thick-set, pellucid, 

 and pale ; the herb in winter bearing no other. In this state it 

 is noticed by Dillenius as a reinarkable variety. 



3. ZOSTERA. Grass-wrack. 



Linn. Gen. 472. Juss. 24. Fl.Br.7. Sm.in Rees's Cycl. w. 39. Lam. 

 t.737. Gcertn.t. 19. 



Nat. Ord. Piperitce. Linn. 2. Aroidece. Juss. 7. Fluviales 

 of Richard. Hook. Scot. 192. 



Cal, none, except an oblong sheath, formed of the base of 

 the leaf, splitting lengthwise. Cor. none. Spadix linear, 

 covered in front with many naked flowers. Anther cylm- 

 drical, tapering at each end, sessile, attached laterally, of 

 1 cell. Pollen mixed with branched fibres. Germen 

 shaped and attached like the anther, and pai'allel to it. 



