370 lxxii. polygonace^e. '(Polygonum. 
the bulbs, and little, if at all, by seed, its triquetrous germen proving 
usually abortive. 
** Styles 3. Achene triquetrous. Stem branched. Flowers axillary. 
Stipules 2-lobed, at length torn. Root fibrous. Knot-grass. 
3. P. aviculdre L. ( common K.) ; leaves elliptic-lanceolate, 
stipules much shorter than the internodes with few distant 
simple nerves, stem herbaceous, achene about as long as and 
covered by the perianth. — a. vulgare; achene striate with raised 
points, the sides ovate. E. B. t. 1252. — 0. littorale ; achene ob- 
soletely striate minutely punctate, the sides ovate-oblong. 
P. littorale Link. P. crassinerve Ces. 
Waste places and way-sides, abundant. — 0. sandy sea-shores. Q. 
5 — 9. — A most variable species. 
4. P. Bail Bab. ( Ray's K.) ; leaves distant elliptic-lanceolate 
flat, stipules much shorter than the internodes with very few 
distant simple nerves, stem procumbent herbaceous, achenes 
longer than the perianth protruded quite smooth and shining. 
E. B. S. t. 2805. P. maritimum Ray Syn. p. 147. P. Roberta 
Loisel. (in part). 
Sandy sea-shores in the west of England, Wales, and Scotland, and 
about Dublin. ©. 7- — -9. — A large straggling species, appearing, 
as Mr. Babington well observes, exactly intermediate between P. 
aviculare and P. maritimum. According to Dr. Meisner, who has 
examined authentic specimens from Loiseleur, P. Roberti Loisel. is a 
mixed species, composed partly of P. aviculare, partly of P. littorale 
Link, and partly of P. Ruyi, “ideoque omniuo delenda.” 
5. P. maritimum L. (Seaside K.) ; flowers axillary, leaves 
crowded elliptic-lanceolate fleshy glaucous revolute at the 
margin, stipules about as long as the internodes with numerous 
branched nerves, stem procumbent woody below, achene longer 
than the perianth protruded quite smooth and shining. E. B. S. 
t. 2804. 
Christ- Church Head on the sandy shore towards Muddiford, Hants. 
Channel Islands. Caroline Park, near Edinburgh (only one plant 
found) : Rev. Walter Little. Killiney Bay, near Dublin. If.. 8, 9. 
*** Styles 3. Achene triquetrous. Flowers panicled or racemose. 
Stipules oblique at the summit. Root fibrous. Buck-wheat. 
f Stem erect, with cymose panicles. 
6. P. *Fagopyrum L. (common B .) : leaves cordato-sagit- 
tate, stem nearly upright without prickles, angles of the achene 
entire wingless. E. B. t. 10-t4. Fagopyrum esculentum Alcench. 
Dunghills and about cultivated land. ©. 7,8. — Stem nearly 
