NEW AMERICAN LYTHRA 267 



parvulis ad basim; petalis obovatis circa 5 mm. longis 3.5 mm. 

 latis. Calyx triangulo-dentatus appendicibus longis, subulatis, 

 reflexis, calicis dentes 3-plo excedentibus. 



Planes glabrous with roundish stems which are slightly 

 winged; leaves 2.5-4.5 cm. long, lanceolate acute or acuminate, 

 sessile rounded or subcordate at the base, scabrous margined, 

 rather thin, pale below and dark green on the surface. Leaves of 

 the inflorescence very numerous large widely spreading or reflexed, 

 closely aggregated 1.5 cm. or more long exceeding the axillary 

 flowers. Branches several long wand-like. Flowers rather large 

 about I cm. in length or slightly more. Stamens 6 long exserted, 

 style included or barely exserted even in. fruit. Ovary about 2 

 mm. long: style and stigma nearly 3 mm. long, calyx nearly 

 6 mm. long, hypanthium subsessile with two minute bracts 

 near the base. Petals obovate nearly 5 cm. long, 3.5 broad, calyx 

 teeth, broad triangular, processes long subulaiie spreading or 

 reflexed about three times as long as the calyx teeth. 



Type No. 240979 of the U. S. National Museum from South 

 Dakota, collected near Sioux Falls in August 1892 by J. J. Thornber. 

 Another specimen is numbered 516395, otherwise alike; both 

 from the herbarium of Thomas A. Williams. So difi'erent does the 

 plant appear from its nearest ally L. alatum Linn, in habit as to 

 seem at first sight more like L. Viilneraria Linn, with which, 

 however, it has no nearer relationship though intermediate perhaps. 



Lythrum parvulum nov. sp. 



Planta simplex vel minus ramosa circa 3 dm. alta vel minor 

 e radice crasso plus minusve erecto ligneo, rhizomata lignosa 

 emittens, caulibus pluribus 4-angulatis cum alis decurrentibus 

 e basi foliorum stricte sessilium; foliis pallescentibus utraque 

 facie, vel glaucis 5x9 mm. usque 7x18 mm. latis et longis ovalibus 

 vel oblongo-linearibus, abrupte acutis vel obtusiusculis, basi stricte 

 sessilibus, cordatis vel rotundatis vel infimis aliquando subcuneatis 

 et obovatis, et in superioribus caulibus praecipue perparvas 

 stipulas in fine alarum habentibus, foliis in inflorescentia linearibus 

 minoribus, margine striguloso, plerumque basi cordatis vel rotun- 

 datis. Flores circa i cm. lati petalis obovatis colore earuni L. 

 alati, mucronatis calice circa 6 mm. longi cujus dentes breves 

 obtusi membranosi, cum appendicibus brevibus, divaricatis, 

 triangulatis, hypanthio cyHndrico sub dcntibus calicis angustato: 



