40 



Sagittaria Aginashi jMakiao sp. nov. 



A glabrous aquatic perennial. Rhizome erect, thick, densely rooting, 

 without any stolon, furnished with small very numerous pedicellate tuher- 

 cules at the base within petiole-vaginte. Leaves radical, ftisciuulate, 

 erect, long-petioled ; lamina nearly perpendicular, firmly, herbaceous, tliickly 

 membranaceous, strongly nervate, sagittate and 12-38 cm. long, but in 

 the inferior ones often simply lanceolate without the basal lobes, 

 linear to broadly lanceolate, acuminate with a subcallose tip, entire, 2- 

 5-nerved on each side ; basal lobes usually shorter than the terminal lob(;, 

 directing downwards with a weak diverging degree, linear to lanceolate, 

 gradually acuminate towards a subcallose tip, entire, 2-4 on the outer 

 side and 1-3 on the inner side of the midrib ; i)etiolc elongated, semi- 

 terete, more or less angiilate above, vaginate at the base. tScai)e erect, 

 higher than the leaves, elongate, terete. llaceme narrow, erect ; rachis 

 shorter than the peduncle, subtrigonous-teretc, usually not branching ; 

 bracts 3-verticillatc on nodes, i)atent, shorter than ])edicels, ovato-deltoid 

 or deltoid-subulate, the inferior ones often subulate-lanceolate with an 

 obtuse tip, herbaceo-membranaceous, scarious and crispate towards the 

 margin ; pedicels 3-whorled, erect-patent, 8-35 mm. in length, the whorls 

 about 5 to 10 to a rachis and distant one another. Flowers monoecious, 

 the female below and male above. Sepals 3, reflexed in flower, ovato- 

 elliptical to oblong, obtuse, entire, herbaceo-membranaceous, scarious to- 

 wards the margin, light-green sluuled with rose-colour, persistent, about 

 7-S mm. long. Petals 3, ami)le, patent, broadly orbicular, white, 

 deciduous. Male flower : Stamens numerous, shorter than the sepals, 

 aggregated ; filament short, glabrous, linear-oblong ; anther elliptical to 

 narrowly oblong, auriculated at the base, extrorse, equalling or longer than 

 the filament in length, basifixed, yellow. Female flower : Rudimentary 

 stamens minute ; ovaries numerous, crowed in a spherical head on a 

 globular receptacle, curved u[)wards and lunato-ovate, laterally much com- 

 pressed, alate-margined, ta[)ering above towards a short and ascending 

 style and minute stigma. Fruit globose, hardly depressed, accom2)anied 

 by persistent se[)als below, green ; the receptacle elevated and globular ; 

 carpels very numerous, crowded, laterally much compressed, cuneate, turned 

 upwards and acutely rostrate, more or less striate on both lateral faces, 

 having a rounded and subcristate outer margin. Seed obovato-oblong, 

 compressed laterally, with a hamate embryo. 



Sagittaria sarjitiifoUa var. Ayinosid J\lakiiio Notes on Jap. I'l. XV. 

 in Bot. Mag., Tokyo,* VI. 1892, p. 49. 



