IITTMEX. 291 



2. OxYRiA. Perianth 4:-parted; 2 inner segmen|;s (pet.) 

 larger. Stam. 6. Stigmas 2, multifid. Nut compreased, 

 with a membranous wing, larger than the persistent seg- 

 ments of perianth ; embryo central. 



3. Polygonum. Perianth 5-parfcd. Stam. 5 — 8. Styles 

 ,2 — 3. Stig. capitate. iSTut trigonous or compre.sSed ; em- 

 bryo lateral, incurved ; cotyledons not contorted. 



4. Pagopyrum. Perianth 5-parted. Stam. 8. Styles 3. 

 Stig. capitate. Nut trigonous ; embryo central ; cotyledons 

 large, leaflike, plicate-twisted. 



1. Eu'mex Linn. Dock. 

 * Fl. perfect. Herbage not acid. Lapathiim Toum. 



1. M. mariiiTtms (L.) ; enlarged pet. rhomboidal narrow, each 

 with a lanceolate entire point a promiinent narrow oblong tubercle 

 and upon each side 2 setaceous teeth as long as the pet., whorls 

 crowded many-flowered leafy, 1. all linear-lanceolate narrowed 

 at both ends. — ^Nut very small ; faces elliptic. — ^Marshes princi- 

 pally neai- the sea. P. or B. VII. VUI. Golden Bock. E. S. I. 



[J!, limdsus (Thuil.) ; enlarged pet. ovate-oblong and on each 

 side 2 setaceous teethj whorls distant, 1. all linear-lanceolate nar- 

 rowed at both ends. — P. palustris Koch, St. 73. 2. Gold Dock 

 Vest. t. 2. f, 7.— A plant to be looked for. See Bot. Gaz. i. 296.] 



2. P^palus'tris (Sm.) ; enlarged pet. ovate-oblong, each with 

 a lanceolate entire point a,prominent narrow oblong tubercle and 

 upon each side 2 or 3 setaceous teeth shorter than tfte pet., whorls 

 distant many-flowered leafy, root-1. narrowly lanceolate rounded 

 or slightly decj.u'rent below. — Curt. i. 68. — Nut 3 times as large 

 as that of i?.' marHimus; faces'ovate. Upper. 1. linear-lanceolate, 

 narrowed below. — Marshy places, rare. P. VII. — IX. E. S. I. 



3. R. conglotnerdttis (MmT.) ; enlarged pet. linear-oblong blunt, 

 each bearing a large tubercle and entire or obscurely tootlied at 

 the base, whorls distafit leafy, 1. oblong pointed, lower 1. cordate 

 or rounded at the base. — P. aautus Sm. P. gloineratus R. I. f. 

 552. — Nut ovate, acute. Enlarged pet. broadest near the base ; 

 the sides nearly parallel. Unopened anth. white- Branches 

 mostly spreading. Uppermost whorls often leafless. — Wet 

 places. P. VI.— VIII. E.S.I. 



[A plant found at St. Aubin's, Jersey,, is probably'iJ. rupestris 

 (Le Gall). It has a narrower base to the enlarged pet., closely 

 placed, whorls, strapshaped lower 1. narrowed to their base.] ' 



4. R. sanguin! eus.(Li.) ; enlarged pet. narrotdy oblong blunt en- 

 tire only, one bearing a tubeircle, whorls distant le€tfless, 1. ovate- 



2 



