CLASS V. ORDER II. 115 



Ulmus fulva. 3Ii. Slippery Elm. 



Branches rough ; leaves oblong-ovate, acuminate, 

 nearly equal at base, unequally serrate, pubescent 

 both sides, very rough ; buds covered with fulvous 

 down ; flowers sessile. 



The slippery elm is well known for the mucilaginous qualities 

 of its inner bark. Leaves rough on the upper side. Calyx and 

 anthers purplish. Stamens from five to eight. Samara reticu- 

 late and ciliated. It is found in different parts of Worcester 

 county, but I have not met with it nearer Boston. — April. 



122. HYDROCOTYLE. 



Hydrocotyle Americana. L. Pennyicort. 



Leaves reniform, somewhat lobed, crenate. L. 



A small plant found in moist ground under the shade of bushes, 

 &c. Stem creeping. Leaves kidney shaped, double crenate, 

 light green, very smooth and thin. Flowers minute, in very 

 small umbels or bunches, sessile. — July. — Perennial. 



Hydrocotyle umbellata. L. UmbcUed Hydrocotyle. 

 Leaves peltate, crenate, emarginateatbase : umbels 

 pedunculated, many flowered, flowers pedicelled. 



An aquatic, larger and firmer than the preceding species. 

 Leaves reniform and peltate, floating in deep water, or erect in 

 shallow. Umbels found only in shallow water, or wet ground. — 

 Fresh pond. — July. 



Hydrocotyle lixeata. Mx. Linear Hydrocotyle. 



Leaves sessile, linear-cuneate; umbels pedunculate. 

 Sijn. Crantzia lineata. Nutt. 



Found creeping on the muddy banks of ponds. Whole plant 

 very smooth. Leaves about two at each joint, an inch or more 

 in length, obtuse, succulent ; marked with about five transverse 

 nerves. Umbels eight or ten flowered. Fruit roundish. Com- 

 missure excavated, seeds unequal. — July. — Perennial. 



