KUNGL. SV. VET. AKADEMIBNS HANDUNGAE. BAND 55. N:0 5. 



83 



nervation of leaves and ligules. It joins to the Polygoni {Ochreati and Compressi) by 

 the leaf-base also, but differs by the structure of the peduncle, stem, and leaves. 



The two species here below 

 considered have the front-field of 

 thestipularsheathslO— 15-fibrous, 

 in this respect also keeping a me-^ 

 dium position between the two 

 groups mentioned above. If the 

 Oxyphylli nevertheless be con- 

 sidered, on accountof thestylesand 

 stigmas, to belong to the Pusilli, 

 they must, however, form a sepa- 

 rate series within this subsection. 

 Their nearest relative among the 

 Pusilli may be P. orientalis 

 Hagstr. 



Assumably P. sibiricus Ar. 

 Benn., p. manchuriensis Ar. 

 Benn. an d P. Henningii Ar. Benn. 

 are to be included with the oxy- 

 phyllus-group, and the distribution 

 area of the group would thus be 

 decidedly Asiatic. 



P. oxypliyllus Miquel. 



Annales Mus. Bot. Lugduni-Batav. Ill, 1867, 

 161. — Fig. 32. 



Stem and peduncle compressed so that the 

 crosscut-form becomes oval (2—3 : 1), the former 

 sometimes sligtly canaliculate, both of about the 

 same thickness. 



The anatomy is the one common to the body of 

 the small-leaved species, but the epidermis-cells are 

 comparatively broad, about 2—3 times as long as 

 broad. The subepidermal bast-bundles are strong, 

 but no pseudo-hypoderma has been observed. For 

 the rest I refer to the fig. 32, D. The central axis 



Fig. 32. P. oj-i/pJii/Jhis MiQ. A, a, basis and 

 b top of a stem-leaf, Y. B, Pistil, o, lateral view, 

 b, from above, c, ventral view, y ; ^> Transverse 

 section of a stem-leaf, showing the lacunar system 

 (I), vascular bundles [m, n'), and the mechanical 

 strands (str), lower half, ^y**; Z>, Transverse sec- 

 tion of stem, cc, central axis, str, subepidermal 

 strands, ^ » ^> Transv. sect, of the peduncle, 

 showing the lacunte (/) and vascular bundles 

 (hatched), V- 



shows the usual oblong diagram. 



The two median vascular bundles run close to each other in the peduncle also, 

 the lateral ones, again, more remotely. The small sclerenchymatous strands of the 

 stem seem to disappear completely in the peduncle, which also reaches a length of 

 only 2,5—5,5 cm. The internodes of the stem are in general 4 — 6 cm in length. 



