Polygonacoae. 
335 
13. Inner divisions of the perianth all, or at least one, with 
a callosity . ... . . . . . 14 
— Inner divisions of the perianth all without the callosity Id 
14. Inner divisions of the perianth triangular-oval, all with 
a callosity. Stem 10—20 dm. Ls very large, oblong- 
lanceolate, narrowed at the base.—Marshes, shores; not 
common. W. V. J. Z. S. 7 . Hydrolapathum L. 1901. 
— Inner divisions of the perianth suborbicular or cordate- 
orbicular ........ 15 
15. Ls rather thick, with wavy-crisp edges, lanceolate 
or oblong-lanceolate. Inner divisions of the perianth 
all with a callosity, but 2 of the callosities often smaller 
or indistinct.—Damp meadows, ditches; everywhere. 7 
crispus L. 1902. 
— Ls thinner and larger than in the last, the edges not, 
or only slightly, crisp, oval-lanceolate. Only one of the 
inner divisions of the perianth with a callosity.—Old 
walls and ruins, rarely naturalised (Sion, Aarburg, 
Wild egg). 7.Patientia L. 1903. 
10 (13). Ls very large, cordate-oval, acute, broader towards 
the base, almost triangular. Stem 10—15 dm. R. Hippo- 
lapathum Fr.—Shores, ditches, rare; Neuchatel, Solo- 
thurn, Ziirich, SchafFh. 8 . . aquaticus L. 1904. 
— Ls large, cordate-suborbicular, rounded-obtuse or shortly 
acuminate on the obtuse apex. Stem 5—10 dm.— Alp. 
and subalp., by preference near chalets; wanting on the 
Jura. 8.alpinus L. 1905. 
OBS. Hybrids: li. crispus-nemorosus on the Eschenberg and It. conglome- 
ratus-crispus near Walkenweier (both according to Siegfried). R. alpinus-obtusi- 
folius, Enzeindaz and Pilatus (according to Haussknecht). 
492. Oxyria. Mountain-sorrel. VI, 37. 
1. Ls reniform, emarginate at the top, almost all radical. 
—Detritus of the high Alp. 7 . digyna Hill. 1906. 
493. Polygonum. Knot-grass. VIII, 13, 22. 
Y, 60, 132, 142. YI, 36. 
1. Ls cordate-sagittate ...... 2 
— Ls not cordate-sagittate . . . . 5 
2. Stem erect. Fr. surrounded by the perianth only at the 
base ......... ,7 
— Stem winding. Fr. surrounded by the perianth . 4 
3 FIs rose or white. Corners of the fr. entire. Fagopyrum 
esculentum Monch. 7 . . t Fagopyrum L. 1907. 
— FIs greenish, smaller than in the last. Fr. with sinuate- 
dentate corners. —With the last, introduced and some¬ 
times subspontaneous. 7 . . f tataricum L. 1908. 
