POLYGONEiE. 
259 
*** Ochrea 2-lobed. Root fibrous. Cotyledons incumbent. 
Nut triquetrous. Statn.8. Styles 3. Fl. axillary. Avi- 
cularia. 
10. P. aviculare (L.);fl. 1 — 3 together axillary, 1. lanceolate 
or elliptical plane stalked, ockrece lanceolate acute with few di- 
stant simple nerves at length torn, nut triquetrous striated with 
raised points opaque shorter than the perianth. — E. B. 1252. — 
L. usually blunt sometimes acute. The varieties are innumera- 
ble. Fl. either very distant and scattered, or so much collected 
as almost to form a leafy spike. St. erect or procumbent. A 
form with very short internodes and leaves, small fl. and much 
branched stems occurs on the sandy coasts of the south of En- 
gland ; another with more numerous fl., fleshy elongated st. and 
L is found on the sea-shore and is probably the P. littorale Link. 
A corn-field plant with long slightly branched st. having very 
long internodes, scattered fl., long and much torn ochrere, and 
linear-lanceolate acute 1. is possibly P. virgatum Loisel. — Waste 
places. A. V. — IX. Knot-grass. 
11. P. Raii (Bab.) ; fl. 1 — 3 together axillary, 1. elliptic-lan- 
ceolate, ochrecB lanceolate acute with few distant simple nerves at 
length torn, nut triquetrous smooth shining longer than the peri- 
anth.— E. B. S. 2805. P. Roberti Loisell, Hook. P. dubium 
Beak. Florig. Brit. ii. 576. — St. long, straggling, resembling 
P. avicidare in habit and ochreee, but P. maritimum in fruit. 
Filaments broader at the base. A variety with smaller 1. and 
fl. occurs in the Channel Islands. This may be P. Roberti, 
but I have great doubts on the subject as most of the French 
specimens thus named are the P. avictdare var. littorale men- 
tioned above. Dr. Deakin appears not to have known that this 
plant was described. — Sandy sea-shores. A. ? VIII. IX. 
12. P. maritimum (L.) ; fl. 1 — 3 together axillary, I. elliptical- 
lanceolate coriaceous, ochrece lanceolate with numerous branched 
nerves at length torn, nut triquetrous smooth shining longer 
than the perianth. — E. B. S. 2804. — St. procumbent, quite 
woody below, often much buried. Filaments broader at the 
base. Dr. Deakin (Florig. Brit. ii. 577.) quotes several stations 
for this plant all of which I suspect belong to P. Raii, as I pre- 
sume does Killiney Bay quoted by Hooker. — On the sands of the 
sea-shore near Christchurch Head and in the Channel Islands. 
P. VIII. IX. E. 
**** Ochrece semicylindrical. Root fibrous. Cotyledons ac- 
cumbent, nut triquetrous. Stam. 8. Styles 3. Fl. race- 
mose. Tinaria. 
13. P. Convolvulus (L.) ; st. twining angular, 1. triangular- 
cordate, segments of perianth bluntly Jceeled, nut triquetrous opaque 
