CLASS V. ORDER III. 123 



lets, which support them. Umbel small, terminal. General in- 

 volucre none, partial of short, acuminate leafets. Flowers white. 

 Petals small, ovate, acuminate with the point inflexed. Fruit 

 suborbicular, compressed, striate. — Ditches and ponds. — July, 

 August. — Annual. 



TRIGYNIA. 



136. VIBURNUM. 

 Viburnum Lentago. L. Sweet Viburnum. 



Leaves broad-ovate, acuminate, sharply serrate, 

 petioles margined, curled. Ait. 



A tall shrub in low grounds. Leu/es very finely serrate, the 

 serratures sharp, a little turned inward. Petioles with a mem- 

 branous margin, widest in the upper leaves, waved or curled. 

 Flowers in cymes, as are all the subsequent species. Fruit 

 pleasant to the taste. — South Boston, Cambridge. — June. 



Viburnum pyrifolium. ? L. Pear Leaved Viburnum. 

 Smooth; leaves oblong-oval, subacute, subserrate ; 

 cymes subpedunculate. 



Leaves opposite, oblong-oval extended into an obtuse point, 

 smooth on both sides, coriaceous, slightly serrate or eroded. 

 Petioles and peduncles covered with minute black glands. Cymes 

 nearly sessile, furnished with linear deciduous bractes. Calyx 

 segments short, acute. Segments of the corolla orbicular. — 

 Sides of Monadnock mountain, New Hampshire. — June. 



Viburnum nudum. L. Naked Viburnum. 



Glabrous: leaves oval, revolute at the edge, nearly 

 entire, petioles smootli ; cymes pedunculated. 



Leaves smooth and coriaceous, oval, obtuse or acute, many of 

 them acuminate, obsoletely crenate and slightly revolute. Cymes 

 on peduncles an inch or two long and covered with minute dots. 

 Bractes caducous. — Swamps, rare. — June. 



The leaves have an evergreen and coriaceous appearance and 

 turn black in drying. — Low woods, Cambridge, Weston. — June. 



