286 
66. POLTGOXACE^. 
. ttt Ocrea 2-lobed. Soot Jihrous. Nut triqitetrovs. Stam. 8. 
Sti/ks 3. Fl. axillary, 1 — 3 together. Aviciilaria. 
10. P. aviculure (L.) ; 1. lanceolate or elliptic stalked, ocreee 
lanceolate acute ^cith few distant simple veins at length torn, 
nut striate with raised jwitits opaque about equalling the pe- 
rianth. — E. B. 1252. — L. usually blunt, sometimes acute. Fl. 
either very distant and scattered, or so much collected as almcst 
to form a leafy spike. St. erect or procumbent. Ocrese some- 
times long and much torn. Extremely variable. Nut usually 
falling short of the perianth, but sometimes slightly exceeding 
it. Very variable. Some botanists think that it includes several 
species. — /3. P. littorale (Link) ; st. long diffuse prostrate, 1. thick 
broad, nut minutely punctured finely striate. — Waste places. 
Sands by the sea. A. V. — IX. Knot-grass. E. S. I. 
11. P. Rdii (Bab.) ; /. elliptic-lanceolate^firf, ocrece lanceolate 
acute tvith fetv distant simple veins at length torn, nut smooth 
shining exceeding the perianth. — E. B. S. 2805. P. Kobeili Hook., 
not Loisel. — St. long, straggling, prostr-ate. L. bending towards 
the stem. Resembling P. aviculare in habit, but P. maritimtim 
in fruit. Filaments broader at the base. It varies with smaller 
1. and fl. — P. Roberti (Lois.) is formed of portions of several 
species (DC. Prod. xiv. 89). — Sandy sea-shores. A. or P. VIII. 
IX. E. S. I. 
12. P. 7narit'imum (L.) ; /. elliptic-lanceolate coriaceous 
ibith revolide edges, ocrca lunceolate with many branched veins 
at length torn, nut smooth shining exceeding the perianth. — 
E. B. S. 2804. — St. procumbent, quite woody below, often much 
buried. L. convex above, diverging from the stem. Filaments 
broader at the base. — Sands of the sea-shore. Christchurch 
Head, Hants. Channel Islands. P. VIII. IX. E. 
tttt Ocreee semicylindrical. Root Jibr&us. Nid triquetrous. 
IStaiti. 8. Styles 3. Fl. racemose. Tinaria. 
13. P. Convol'vidus (L.) ; st. tnoning angular, 1. cordate-sagit- 
tate, segments of perianth bluntly keeled, nut opaque striate with 
minute points. — E. B. 941.— St. climbing or prostrate, much 
shorter than in the next species. Perianth sometimes winged, 
when the plant is often taken for P. dunwtorum. — Cultivated 
and waste land. A. VII. — IX. Black Bindweed. E. S. I. 
14. P. dumetorum (L.) ; st. twining striate, 1. cordate-sagit- 
tate, segments of jicrianth winged, nut very smooth and shining. 
—E. B. S. 2811.— St. -sviry, climbing to the height of 4 or 5 
feet.— Thickets in the South. A. VIL— IX. E. 
4. Fagopt'bum Gaert. Buck-wheat. 
[*F. esculen'tum (Moench); st. erect v^dthout prickles, fl. in 
