Dicotyledones. 113 



ferior, i-3-celled, with a single ovule in each cell. Style short ; stigmas 

 1-3. Fruit a i-celled, i-seeded drupe. 



1. Viburnum Opulus, L. (L., opulus, a kind of maple.) CRANBERRY-TREE 

 or HiGH-BUSH CRANBERRY. Shrub, becoming sometimes 12 feet high. Branches 

 upright and smooth. Leaves deeply 3-lobed toward the apex, the lobes dentate. 

 Marginal flowers much larger than the others. Drupe globose, red, acid. In low 

 ground along streams. 



2. Viburnum pubescens, Pursh. DOWNY-LEAVED ARROW-WOOD. Low 

 branching shrub, 2 to 5 feet high. Leaves ovate, coarsely serrate, nearly sessile, 

 acute, soft-pubescent beneath. All the flowers perfect. Drupes oval and nearly 

 black. In rocky woods. 



3. Viburnum prunifolium, L. (L,.,prunus, plum; folium, leaf.) BLACK HAW, 

 STAG- BUSH, or SLOE. Shrub or small tree, with ovate or oval, finely serrate leaves, 



1 to 3 inches long, obtuse at the apex. Cymes compound and sessile. Petioles 

 hardly or not at all margined. Fruit ripening in the fall, oval, bluish black, sweet. 

 In dry or moist soil. 



4. Viburnum Lentago, L. NANNY-BERRY, SHEEP-BERRY, or SWEET VIBUR- 

 NUM. Shrub or small tree with ovate, finely serrate leaves, acuminate at the apex, 



2 to 4 inches long ; petioles long and often margined. Drupes oval, bluish black, 

 with a bloom. Cymes compound and sessile. Along banks of streams and in 

 woods. 



HI. TRIOSTEUM. 



(Abbreviation of triostesspermum, from Gr., tri, three; osteon, bone; sperma, seed; 

 alluding to the three bony seeds.) 



Perennial herbs, with opposite leaves much narrowed below the 

 middle, sessile and connate around the stem. Flowers axillary, sessile, 

 solitary or clustered. Calyx with 5 linear-lanceolate lobes, its tube 

 ovoid. Corolla but little longer than the calyx, 5-lobed, its tube cam- 

 panulate or tubular, swollen at the base. Stamens 5, inserted on the 

 corolla tube. Ovary generally 3-celled with i ovule in each cavity. 

 Style slender ; stigma 3-5-lobed. Fruit an orange or red drupe, con- 

 taining bony nutlets. 



1. Triosteum perfoliatum, L. (L., per, through ; folium, leaf.) FEVER-WORT 

 or HORSE-GENTIAN. Stems stout, 2 to 4 feet high, beset with soft hairs. Leaves 

 oval, abruptly constricted below the middle, 4 to 9 inches long. Flowers brownish 

 purple, clustered in the axils of the leaves. Drupes orange-color. In rich soil. 



2. Triosteum angustif61ium, L. (L., angustus, narrow; folium, leaf.) YEL- 

 LOW or NARROW-LEAVED HORSE-GENTIAN. Stems more slender than in the 

 preceding species, bristly hairy, i to 3 feet tall. Leaves lanceolate, tapering below 

 the middle, 3 to 5 inches long. Flowers pale greenish yellow, usually solitary in the 

 axils. In shady situations. 



