584 RUBIACEAE 
O. uniflora, L. (Fig. 3, pl. 150.) CLUSTERED BLUETS. Stem weak, 
half prostrate, branched, spreading, 1 to 15 in. long. Leaves egg-shaped 
to oblong. Corolla inconspicuous, white, shorter than the calyx. Wet 
places, southern New York, and southward. June-Sept. 
3. CEPHALANTHUS, L. 
Shrub, with the white flowers in a dense round head, hanging by a long 
flower stem. Calyx tube 4-toothed; corolla tubular, wider at top and 
4-lobed. Style 1, long, slender; stamens 4, inserted in the throat of the 
corolla. Fruit small, dry and hard. 
C. occidentalis, L. (Fig. 8, pl. 150.) Burron Busu. Shrub, 3 to 
10 ft. high, with large opposite or whorled egg-shaped leaves on long 
leaf-stems and with ball-like clusters of white flowers. Wet grounds, 
borders of streams. June-Sept. 
4. MITCHELLA, L. 
Small, trailing herb, with opposite, dark shining evergreen Jeaves and 
white flowers in pairs. Stipules minute. Calyx 3- to 6-lobed. Corolla 
of a long slender tube and 4 or more recurving lobes, bearded in the 
throat. Stamens 4 or more. Pistil in some flowers extending much be- 
yond the throat of the corolla, while the stamens are included within the 
corolla. In other flowers the exact opposite condition prevails, namely, 
the stamens extend beyond the corolla and the pistil is hidden in the tube. 
Fruit a red berry. 
M. repens, L. (Fig. 7, pl. 150.) PartripcE Berry. Stems 3 to 12 
in. long. Leaves nearly round. Flowers growing as twins from the single 
flower stem and both sometimes appearing as if enclosed at the base by 
the same calyx. Fruit red, rarely white, edible but rather tasteless. 
Rich woods, our area. April-June. 
5. DIODIA, L. 
Herbs, with opposite, stipulate leaves and small flowers in the leaf- 
axils. Stems more or less decumbent or quite erect. Calyx ovoid, in our 
species 4-parted. Corolla tubular, spreading toward the border, which is 
usually 4-lobed. Stamens 4, inserted in the throat of the corolla and 
extending beyond the corolla. Ovary 2-celled with a single ovule in each 
cell, 
l. D. virginiana, L. (Fig. 1, pl. 150.) LArcer BurTon-weep. Plant 
decumbent or nearly erect, hairy or smooth, bearded. Leaves lance-shaped 
to linear, without leaf-stems. Flowers white, 1 to 3 in the leaf-axils, tube 
of corolla slender, expanding suddenly into a 4-lobed, wheel-like border. 
Style 2-parted. Fruit at first fleshy, becoming dry. Low grounds, New 
Jersey, and southward. June-Aug. 
Z. D. teres, Walt. (Fig. 2, pl. 150.) Roveam Burron-wrep, Usually 
rough hairy, spreading, stems more or less prostrate or nearly erect. 
Leaves opposite, without leaf-stems, narrow lance-shape or linear. Co- 
rolla does not suddenly expand, as in No. 1, lilae, light purple or white. 
Style not divided as in No. 1. Fruit pear-shaped, hairy. Dry soil, south- 
ern New York, Connecticut, and southward. July-Sept. 
