1G4 OCTANDRIA TRIGYNIA. [PolygoAuttl. 



Sandy sea-shores in the west of England, Wales, and Scotland, and 

 about Dublin. Fl. Aug. Sept. ©. — A large straggling species, ap- 

 pearing, as Mr Babington well observes, exactly intermediate between 

 P. aviculare and P. maritimum. 



5. P. nmrilimum, L. (sea-side Knot- grass^ ; flowers axillary, 

 leaves crowded elliptico-lanceolate fleshy glaucous, stipules about 

 as long as the internodes with about \'2 nerves at length torn, 

 stem procumbent woody below, fruit longer than tiie perianth 

 quite smooth on the surface. Bab. in hinn. Trans, v. xvii./>. 457, 

 and in E. Bot. Siippl. t. 2804. 



Christ-Church Head, on the sandy shore towards Muddiford, where 

 it was recently discovered by J\Ir Sorrer. Herm Sands, Jersey, 3Ir 

 Treve/i/au ; and Grand Havre, Guernsey, Babington and Christy. 

 •Fl. Aug. Sept. 11 . — This, which is considered by Mr Borrer as the true 

 P. muritimtnn, has nevertheless stipules shorter than the internodes, and 

 with fewer nerves than the continental specimens. 



6. Y*.*Fagopyrum, L. (^Buch-Wheat^; leaves cordato-sagit- 

 tate, stem nearly upright without prickles, angles of the fruit 

 even. E.Bot.t. 1044. 



Dunghills and about cultivated land. Fl. July, Aug. 0. — Stem 

 nearl}' erect, waved, 1 foot high, branched. Flowers in spreading jioni- 

 cles, terminal and lateral, pale reddish. An excellent food for poultry. 



7. P. Convolvulus, L. (^climbing Buck- Wheat); leaves cor- 

 dato- sagittate, stem twining angular, segments of the perianth 

 bluntly keeled, fruit opaque striated with minute points. E. 

 Bot. <. 941. 



Corn-fields, frequent. Fl. July, Aug. 0. — Very long, climbing. 

 Spikes lateral and leafy, of 4 whorled ^reeinsh flowers. 



8. P.*dumet6rum, L. (copse Buck- wheat); leaves cordato- 

 sagittate, stem twining striated, segments of the perianth with a 

 membranous wing, fruit quite smootli and shining on the surface. 



Wood at Wimbledon. 3Jr J. A. Hanliey. Hedge by Wood's Nur- 

 sery, near Marcsfield, Sussex. Air Borrer. Fl. Sept. 0. 



** Styles mostly 2, and fruit compressed, or 2-edged. 



9. P. amphibium, L. (amphibious Persicaria); flowers pentan- 

 drous, styles forked, spike oblongo-ovate, leaves petiolate cor- 



dato-lanceolate rough at the margins. E. Bot. t. 4J36 a. aqua- 



ticum; leaves floating broadly lanceolate glabrous, spikes oblong. 

 — /S. terrestre ; nearly erect, leaves narrow-lanceolate rough with 

 short rigid appressed hairs on both sides, spikes ovate. 



Margins of ponds, lakes and ditches, frequent. Fl. July, Aug. If. — 

 Stem 2 — 3 feet long, scarcely branched when growing in the water. 

 Leaves arising from long tubular sheaths or stipules ; glabrous in «. 

 but hispid in |3. Spikes mostly solitary, terminal, of a bright rose-colour. 

 This is t'.ie only perennial species of the Persicaria groupe. 



10. P. Persicaria, L. (spotted Persicaria); flowers hexandrous,, 

 styles forked, leaves lanceolate (often spotted), spikes oblonjj 

 erect their peduncles smooth, stipules fringed. E. Bot. t. 756. 



