Hfl v^ tf pg ^ H J? + U 

 THE BOTANICAL MAGAZINE. 



[Vol. V. March 10,1891. No. 49, ] 



A N6W Japanese Siom. 



Ryokichi Yatabe^ Sc. D. 



Slum ovatum, nov. sp. 



Nom.Jap, Hiroha-7io-miinazeri. 



(Plate XXII.) 



Rootstock short, stoloniferous, with numerous fibrous roots. Stem gla- 

 brous, green, erect, sulcate or angular, branched at the top, 3-4 feet high, 

 \ inch thick at the base. Leaves glabrous, pinnate. Lower leaves long- 

 stalked, with 3-5 pairs of sessile pinnae; leaflets ovate or oblong-ovate, sharply 

 serrate, 1-4 inches long; terminal leaflet often broadly ovate or almost orbicular, 

 sometimes deeply cordate at the base. Upper leaves short-stalked with 1-3 

 pairs of pinnae, or soinetimes simple; leaflets ovate, lanceolate, or linear- oblong, 

 often with acuminate serratures. Umbels at most lo-rayed; rays about i inch 

 long including the umbellets; bracts of the involucre about 6, linear or subulate, 

 2-5 lines long. Umbellets at most 20-flowered; bracteoles of the involucel 

 about 6, subulate, unequal. Flowers white, a little over i line across; calj'x- 

 teeth dentiform; petals imbricate, obcordate, with an inflected point; st3-"Iopod 

 convex. Cremocarp subovoid, curved, one of the mericarps being but little 

 developed, 1J-2 Unes long; mericarps with 5 projecting ribs; vittas unequal, 1-2 

 in each interval, i under each rib. Carpophore 2-partite, the branches very 

 slender, Seeds subterete, somewhat curved. — In ditches and wet places. 

 Fl. August — October. 



