266 AMERICAN MIDLAND NATURALIST 



developed. The vegetable characters are, however, so striking 

 as to warrant segregation on these marks alone. The type is in 

 the herbarium of the United vStates Department of Agriculture, 

 collected by S. B. Buckley somewhere in N. Carolina, Georgia, 

 or Florida. " Distrib. by the Shaw School of Botany." No more 

 details are given on the label. 



By vegetative characters alone the plant deserves to be 

 distinct from any other Lythra to which it may be referred. The 

 leaves are as strictly opposite and decussate as in L. linear e Linn., 

 and yet as evident from their description not at all like those 

 of typical L. alatum Linn. The slender separate twigs have the 

 long scarcely branched appearance of the plant called by some 

 L. flagellare, but the cordate broad leaves distinguish it from this. 

 The calyx and hypanthium are of a totally different kind. The 

 mode of branching is decidedly divaricate opposite, and more 

 leafy. The hypanthium differs too in being ridged or even creased. 



The plant differs from L. lineare Linn, in the shape of the 

 leaves which are broader and shorter, the branches are tetragonal 

 or even winged, but the habit about the same. 



From L. gracile Bentham, a Mexican plant, its nearest ally 

 in appearance of habit and branching it differs by having broader 

 oval leaves shorter than the internodes. Though the branches 

 are long and gracilient the flowers have a different calyx, rather 

 more like L. alatum with long reflexed appendages than calyx 

 segments or teeth. These in L. gracile Bentham are subequal. 

 The hypanthium, deeply ridged in L. cprdifolium, is only slightly 

 striate or terete in L. gracile. The latter, moreover, is suffruticose. 



Lythrum dacotanum nov. sp. 



Planta glabra caule et ramis subteretibus aliquantulum 

 alatis, foliis lanceolatis, sessilibus vel basi rotundatis vel sub- 

 cordatis, acutis vel acuminatis, marginibus scabris, 2.5-4.5 cm. 

 longis subtus pallescentibus facie superiore viridibus: fqliis in- 

 florescentiae permultis divaricatis vel reflexis, tenuioribus sibi 

 propinque aggregatis, 1.5 cm. longis vel longioribus, flores axillares 

 excedentibus: ramis paucis virgatis, elongatis. Flores magni 

 circa i cm. longi, staminibus 6, longe exsertis, stylo incluso vel 

 baud exserto etiam fructu facto; antheris suborbicularibus 

 subnigris; ovario circa 2 mm. longo; stylo et stigmate circa 3 

 mm. et calicc circa 6 mm. longo, subsessili, cum duabus bracteis 



