LIMOSELLA AQUATICA L. YAH. TENUIFOLIA HOOK. F. 337 



both European, Asiatic, and North American plants of the L. 

 aquatica have the foHage narrow as that of L. tetmifolia, to which 

 variety some arctic individuals of L. aquatica are quite similar." 



The following description is taken from the specimens collected 

 at Peufig Pool : — 



Au annual herb, small, densely c?espitose, usually without run- 

 ners, but in some cases stoloniferous, acaulescent, erect, rather 

 glossy, glabrous, inconspicuously and minutely sessile-glandular, 

 1-5-5 cm. high, palustral or aquatic ; root-fibres numerous, 

 branched, limp, intricate, compressed, very slender, whitish ; 

 leaves all radical, numerous or several, crowded, imbricate at the 

 base, linear-filiform, subterete, somewhat compressed, firmly and 

 slightly fleshy, succulent, grass-green or towards the base pallid, 

 gradually or scarcely tapering-subulate towards the obtuse apex 

 from the subscariously somewhat dilated and clasping base, without 

 expanded blade above, entire, 1-2-5 cm. long, erect or suberect, or 

 the outer ones somewhat diverging ; stipules ; scapes several or 

 few, often fewer than the leaves, arising from the axils or inner 

 faces of the leaf-bases, erect or suberect in flower, filiform, terete, 

 firmly and slightly fleshy, grass-green, 1 -flowered, shorter than the 

 leaves, •6-2-5 cm. long, nearly straight or gently curved or in 

 fruit more or less strongly carved downwards ; bracts ; flowers 

 about 2-5 mm. long, erect, ebracteolate ; calyx oblong-campanulate 

 in flower, somewhat funnel-shaped at the base, shortly toothed at 

 the apex, transparent, subscarious, longitudinally but not strongly 

 6-nerved or -ribbed, persistent, subhemispherical in fruit, 1-5- 

 1-7 mm. long or in fruit a little more ; the teeth shortly triangular, 

 apiculate, 5 or occasionally 4 suberect, the sinus between the two 

 uppermost of the five less deep than between the rest ; the veins or 

 ribs greenish; corolla membranous, transparent, marcescent, pearly 

 white or greyish ; the tube campanulate-oblong, rather exceeding 

 the calyx, 1-7-2 mm. long; the limb spreading, very nearly regular, 

 5-partite, about 3 mm. in diameter; the segments ovate-oval, rounded 

 or obtuse at the apex, approximate at the base, imbricate in the bud, 

 shorter than the calyx, about 1 mm. long ; stamens 4, didynamous, 

 glabrous ; the filaments rather short, filiform, inserted on the upper 

 part of the corolla- tube ; anthers 4, small, rounded, by confluence 

 of the cells unilocular, rounded, approximating about the mouth of 

 the corolla ; anther-walls transparent, thin, minutely stellate- 

 marked ; pollen spheroidal, smooth, marked with 2 meridional 

 lines ; disk ; ovary small, roundly oval, a little narrowed at the 

 base, compressed, superior, sessile, unilocular or imperfectly 2- 

 celled ; ovules numerous, inserted on the central fleshy placenta ; 

 style rather short, filiform, 1-1-5 mm. long, glabrous, included, 

 somewhat curved or straight, oblique, apical, slightly excentric ; 

 stigma small, capitate, bilobulate, papillose ; capsule subglobose or 

 spheroidal, a little compressed, 1*7-3 mm. in diameter, smooth, at 

 length bursting the calyx, bivalved ; seeds rather numerous, irregu- 

 larly and obliquely oblong, longitudinally ribbed and furrowed, 

 very delicately scored crosswise, about -6 mm. long, dusky yellowish ; 

 the ribs and furrows few ; the transverse scores numerous ; testa 



JouKNAL OF Botany. Vol. 39. [Oct. 1901.] 2 b 



