Spring Flora op Oklahoma 
175 
or lobed, with or without stipules. Flowers small, white, 
in terminal cymes. The outer flowers of the cyme some¬ 
times greatly enlarged and sterile. Calyx-tube very small, 
5-toothed. Corolla wheel-shaped or bell-shaped, 5-lobed. 
Stamens 5, inserted on the tube of the corolla. Ovary 
1-3-celled. Style short, 3-lobed. Fruit a 1-seeded drupe. 
Leaves and scarcely-winged petioles glabrous, or nearly 
so. 1. V. pruni folium. 
Veins of lower leaf-surfaces and winged petioles tomen- 
tose. 2. V. rufidulum. 
1. Viburnum pr unifolium L. Black Haw. A shrub or small 
tree. Leaves short-petioled, ovate or broadly oval, l'-3' long, finely 
serrulate. Petioles rarely margined. Cyme sessile, several-rayed, 
2'-4' broad. Drupe oval, bluish-black and glaucous. 
In dry soil. April-June. Common. 
2. Viburnum rufidulum Raf. Southern Black Haw. A small 
tree, becoming 20° high. Leaves elliptic to obovate, finely and sharp¬ 
ly serrate or serrulate, the veins brown-tomentose beneath. Petioles 
3"-8" long, winged, brown-tomentose. Cymes large, the principal 
rays 3-5, mostly 4. Flowers 2Y 2 "-3" broad. Drupe oval, blue with 
a bloom. 
In woods and thickets. April-May. Common. 
III. TRIOSTEIIM L. 
Perennial herbs. Leaves opposite, connate-perfoliate or 
sessile, narrowed below the middle. Flowers axillary, per¬ 
fect, solitary or clustered, sessile, yellowish, green, or pur¬ 
plish, 2-bracted. Calyx-tube ovoid, 5-lobed, foliaceous. Cor¬ 
olla-tube campanulate, gibbous at the base. Stamens 5, in¬ 
serted on the corolla-tube. Ovary 3-5-celled. Stigma 3-5- 
lobed. Drupe coriaceous, orange or red, enclosing 2-3 1- 
seeded nutlets. 
1. Triosteum perfoliatum L. Fever-wort. Stem finely gland¬ 
ular-pubescent, 2°-4° high. Leaves ovate to broadly oval, 4'-9' long, 
2'-4' wide, connate-perfoliate, soft-pubescent beneath, somewhat hairy 
above, the margins entire or sinuate. Bracts linear. Corolla dull 
purplish-brown, greenish below, 6"-10" long, viscid-pubescent. Fila¬ 
ments bearded. Drupe obovoid-globose, orange-yellow, densely and 
finely pubescent. 
In rich soil. May-July. 
