2IO AMERICAN MIDLAND NATURALIST 



(c) Lower petal spurred, flowers violet blue. Style not 



capitate. . Subgenus Eucentrion (type V.rostrata) Pursh. 

 (c( Lower petal not spurred, flowers not blue, white 

 within, base yellow. Style capitate. Subgenus 



Eulophion (type V. canadensis Linn.) 

 (c) Lower petal spurred. Flowers white or cream colored. • 

 Style not capitate Subgenus Rhabdotion (type V. striata Ait.) 

 (a) Cleistogamous flowers absent. Plants annual or biennial 



Genus Mnemion' (type V. tricolor Linn.) 



Onionychion Gen. Nov. Viola Linn, pro parte. 



Planta acaulescens ramulos stoloniferos carens, radicibus 

 fibrosis rhizomate praemorso, carnoso, erecto, brevi, vel cormo 

 elongate, stricte simplice nunquam ramoso; floribus cleistogamis 

 nullis, vernalibus autem magnis purpureis; foliis vernalibiis 

 parvis, subpedate 5-9-partitis, laciniis latioribus; aestivis yero 

 linearibus longioribus et angustioribus cum pedunculo flores 

 multo excedente, 4-angulato. Stamina cum appendicibus magnis, 

 antheris sessilibus, bina inferiora caudata, inferius obtuse plus 

 minus ve calcaratum. Petala non barbata. Stylus clavatus eros- 

 tratus, apice oblique concavus, cum stigmate in tuberculo parvo, 

 quod eodem medio apice concavo inclusum est. 



Acaulescent stolonless plants with fibrous roots without 

 acstival cleistogamous floWers and with large showy purplish 

 vernal ones. Rootstocks short, premose, erect, or elongate corm- 

 like, unbranching. Leaves of two kinds, small early ones broad- 

 lobed less dissected. Orange stamen tips large, or obovate, anthers 

 sessile the two lower with a curved projection into the more or 

 less saccate spur. Style club-shaped, beakless, obliquely concave 

 at the summit. Stigma within a small protuberance near centre 

 of cavity. Petals all beardless entire. Peduncles somewhat 4- 

 angled much longer than leaves. 



Oionychion pedatum (Linn.) Comb. Nov. 



Viola pedaia Linn. Sp. PI. p. 933, (1753). 



Oionychion pedatum var. inornatum (Greene). 



Viola pedata var. inornata Greene Pitt. IIL, p. 35, (1896). 



I The name Ion. Medicus Malv. p. 102, (1787), is probably only a 

 synonym for the Linnaean Viola, and not meant as a segregate of the pansics 

 from the genus. The name was a synonym before Linnaeus and is but 

 the literal Greek translation of the Latin Viola. Ion arvense would be less 

 appropriate than Mnemion arvense. We therefore reject the name in favor 

 of the later Mnemion Spach. 



