230 CLASS XIII. ORDER I. 



medicinal, answering as a substitute for jalap. — It is found native 

 at Medway, twenty-five miles from Boston. — May. — Perennial. 



236. NUPHAR. 



NuPHAR ADVENA. Ait. Yellow Water Lily. 



Calyx six leaved; petals numerous; capsule fur- 

 rowed; stigma crenate; leaves heart shaped, the lobes 

 divaricate. 

 Syn. Nymph^a advena. Ait. Kew. \st. Edit. 



This plant is usually considered distinct from the Nuphar 

 lutea of Europe, though there is still some confusion in the dis- 

 criminating marks laid down by authors. The present species 

 certainly partakes the character of both. Are they in reality 

 more than varieties ? 



Roots very large, creeping and irregular, like those of Nym- 

 phsea. Leaves oblong-heart shaped with rounded lobes, polished 

 on the upper surface, always floating in deep Avater, and erect in 

 shallow. Petioles exactly semicijlindrical. Scapes round, spongy, 

 made up of equal longitudinal tubes, which are hairy Avithin, as 

 seen by a magnifier. Calyx of six concave leafets, the three out- 

 ermost green and roundish or ovate ; the three inner ones resem- 

 bling petals, somewhat wedge-shaped, retuse, yellow shaded 

 with dull crimson, sometimes with green. 



Petals ? about fourteen, less than half the length of the calyx, 

 yellow, wedge shaped, truncated, fleshy, impressed by the sta- 

 mens, but without any thing like nectariferous furrows. Sta- 

 mens numerous, linear, flat topped, erect in the bud, recurved in 

 the flower, inserted into the sides of the receptacle below the 

 germ. Anthers of two longitudinal cells on the upper side of the 

 filaments. Germ large, ovate, furrowed on the outside. Stigma 

 peltate, sessile, circular, its border slightly undulated or crenate, 

 its upper surface with a central depression, from which pro- 

 ceed about twenty slightly prominent rays, which, by their ap- 

 pearance, are so many distinct stigmas, each one corresponding 

 to a cell in the germ. — Ponds and ditches. — May, June. — Peren- 

 nial. 



The furrowing of the petals and germ, and the crenatures of 



