EICHHORNIA (named in honour of J. A. F. Eichhorn, an eminent Prussian). ORD. Pontederiaceoe. Interesting and beautiful stove aquatics, natives of South America and tropical Africa. They may be placed in large pots, filled with rather coarse rich soil, which should afterwards be immersed and kept in a tank of water heated to about 80deg. EICHHORNIA crassipes floats on the surface of such water, and grows freely, without the roots being in soil. Propagated by division of the rhizomes, in spring. EICHHORNIA azurea (blue). fl. scattered or crowded in pairs along a stout, hairy, sessile rachis; perianth bright pale blue, funnel-shaped, hairy externally. July. l. on long or short petioles, which are not inflated; very variable in size and shape, 3in. to 8in. in diameter, from rounded-cordate to trapeziform or rhomboid, or very broadly oblate and obcordate, rounded-retuse or sub-acute at the tip. Stem as thick as the thumb, floating and rooting, green, smooth, flexuous. Brazil, 1879. (B. M. 6487.) EICHHORNIA crassipes(thick-stalked). fl. funnel-shaped, about 1 1/2 in. long, of six ovate-oblong violet segments; racemes many-flowered; flower-stalks thick; spathe terminal, recurved. Summer. l. large, fleshy, orbicular, acute-stalked; stalk much thickened at the base. Rhizome thick. 1879. (B. M. 2932, under name of Pontederia azurea.) EICHHORNIA paniculata (paniculate). fl. in a compound spike of from ten to twelve; perianth petaloid, two-lipped; lower lip of three purple segments; upper and smaller of three blue ones, with a two-lobed white spot in the centre, yellowish in the disk. Summer. l., radical ones on long petioles, all cordate and acuminate, entire, striated; the sinus at the base deep and narrow. Stems often several from the same root, 1ft. to 1 1/2ft. high in the strongest specimens, erect, terete, soft and herbaceous, sheathed below with the membranaceous and stipulate bases of the radical leaves, and a few long leafless scales. South America. (B. M. 5020, under name of EICHHORNIA tricolor.)