476 DIAPENSIACEAE 
backward. Stamens 10, the anthers in contact forming a cone about the 
pistil. Fruit a red acid berry. 
1. O. palustris, Pers. (Fig. 1, pl. 117.) Smaxn. Cranperry. (0. 
Oxycoccus, (L.) Me. M.) Stem 6 to 18 in. long. Leaves egg-shaped, 1/6 
to 1/3 in. long, acute at apex, margins strongly rolled back. Flowers all 
terminal. Berries red, 1/3 in. in diameter. May-July. 
2. ©. macrocarpus, (Ait.) Pers. (Fig. 2, pl. 117.) Laree AMERI- 
CAN CRANBERRY. Leaves oval, 1/4 to 2/3 in. long, margins slightly rolled 
back, points blunt. Flowers not generally terminal. Berries red 1/3 in. 
in diameter. June-Aug. 
Famity VI.—DIAPENSIACEAE. DisApensta FAmMILy 
In our region only two species which are very small, moss-lke, 
tufted, evergreen plants of herbaceous appearance but with woody 
stems, small crowded leaves without stipules and with perfect bell- 
formed or wheel-shaped flowers. Calyx deeply 5-parted; corolla 
5-lobed; stamens, 5 pollen bearers and 5 rudimentary. Ovary 
free from the calyx and superior to it; capsule 3-celled, many 
seeded. 
1. DIAPENSIA, L. 
Calyx partly invested by 2 to 4 bracts below its base; corolla bell- 
shaped. Small Alpine mossy plant growing in dense tufts. Leaves op- 
posite, overlapping, small, spatula-shaped. Stem 1 to 3 in. high, termi- 
nated by a single white bell-shaped flower. 
D. lapponica, L. (Fig. 3, pl. 117.) DtapensiA. Found on summits 
of the Adirondack and White Mountains. June-July. 
2. PYXIDANTHERA, Michx. 
Moss-like plant, resembling Diapensia, the stems longer, prostrate, 
creeping, corolla wheel-shaped. Flowers solitary, white or rose-color, 
numerous, 
P, barbulata, Michx. (Fig. 10, pl. 117.) Pyxm. This little plant 
blooms early in April or even in March and is welcomed as the first 
flower of Spring. Grows in rounded tufts, in the pine barrens of New 
Jersey and farther south. 
Order II.—PRIMULALES. Order of the Primroses 
Flowers regular; corolla of united petals. Stamens borne on the 
corolla, as many as the lobes of the corolla and opposite to them 
or twice as many or more. Ovary superior to the calyx and co- 
rolla or in exceptional instances these are more or less attached to 
it. Ovules arising from a central placata. Style single; fruit a 
capsule, 
