190 THE FLORA UF THE DAKOTA GROUP. 



Protophyllum ceenatum.' 

 PL LXV, Fig. 7. 



Leaf small, nearly round or ovate (upper part destroyed), 4™ long' 

 T"" broad, api)arently of thin texture, obscurely undulate-dentate on the bor- 

 ders, round peltate, the strong median nerve passing under the border 1.5™ 

 above the base ; basilar lower pair of secondaries horizontal, the four i)airs 

 above opposite, curving in traversing the lamina, more or less branching. 



The pelta or border base is not auricled, or like a continuation of the 

 border, but is traversed downward by four smaller nerves from the base of 

 the median nerve, and curving along the borders. There are two speci- 

 mens of the small leaves which by their characters appear identical with 

 P. imdidatum as figured (PI. XLII, Fig. 2), but far different in the size of the 

 leaves and their texture. 



Habitat: Ellsworth County, Kansas. No. 567 of the collection of Mr. 

 R. D. Lacoe. 



Protophyllum dimorphxjm, sp. nov. 

 PI. XLI, Fig. 1. 



Leaf small, coriaceous, rigid, round-quadrangular in outline, truncate, 

 enlarged, obtusely lobed at apex, cordate and entire at base, undulate-den- 

 tate on the borders, ])etioled; nervation very thick, craspedodrome; basilar 

 primaries tlu-ee pairs, the upper at right angles, simple on one side, branch- 

 ing on the other, the middle attached to the base of the upper, curving 

 downward, the lower very thin, close to the borders or marginal; seconda- 

 ries three to four pairs, the lower opposite and branching, the upper with 

 few branches and alternate; nervilles strong, forlced at the middle or anas- 

 tomosing l)y oblique branches. 



This fine small leaf is remarkable for the abnormal disposition of its 

 nerves and the unequal width of the lamina, being more expanded, as seen 

 by the figure, on the right side of the median nerve. Owing to this the 

 lateral nerves are longer apd more branching on the right side than on 

 the left. The secondaries pass to the point of the short teeth or luidula- 

 tions of the borders, which by contraction at their extremities and declining 

 on both sides become thus slightly emarginate. The leaf seems to have 



I This species was marked "Protophyllum undiilatum or u. sp." iu the manuscript by Prof. Les- 

 quereux. As it seems from the appearance of the leaves and by the description to difl'er from 

 P. ttndulatum, I have thought best to regard it as a new species, and have named it ProtophyUum 

 frenatum. — F. H. K. 



