712 FLORA. 



3. Oxycoccus erythrocarpus (Michx.) Pers. Southern Mountain Cran- 

 berry. (I. F. f. 2801.) A shrub, 3-18 dm. high. Leaves thin, green both sides, 

 paler beneath than above, reticulate-veined, ovate, ovate-lanceolate, or ovate- 

 oblong, acuminate, flat, 2.5-7.5 cm. long, 12-25 mm - wide; peduncles pendulous, 

 filiform, less than half as long as the leaves; corolla red, about I cm. broad; fila- 

 ments villous; berry globose, dark red when ripe, acid, 4-6 mm. indiameter. In 

 woods, mountains of Va. to Ga. June-July. 



Family 6. DIAPENSIACEAE Link. 



Diapensia Family. 



Low tufted shrubs, or perennial scapose herbs, with alternate or basal 

 simple estipulate leaves, and small, white pink or purple, perfect and regu- 

 lar flowers, solitary in the axils, or racemose at the summit of scapes. 

 Calyx 5-parted, persistent; sepals imbricated in the bud. Corolla 

 5-lobed, 5-cleft, or 5-parted, deciduous. Stamens 5, inserted on the 

 throat of the corolla and alternate with its lobes, or connate, sometimes 

 with as many alternating staminodia; pollen-grains simple. Disk none. 

 Ovary free from the calyx, superior, 3-celled ; style persistent; stigma 

 3-lobed ; ovules anatropous oramphitropous. Capsule 3-celled, loculici- 

 dally 3-valved. Seeds minute, the testa loose or close ; endosperm 

 fleshy; embryo terete ; cotyledons short ; radicle elongated. Six genera 

 and about 8 species, natives of the northern hemisphere. 



Low tufted evergreen shrubs ; corolla gamopetalous. 



Tufted arctic-alpine shrub; flowers terminal, peduncled. 1. Diapensia. 



Trailing shrub; flowers solitary, sessile. 2. Pyxidanthera. 



Tall scapose perennial'herb; flowers spicate-racemose; petals separate. 



3. Galax. 



1. DIAPENSIA L. 



Densely tufted glabrous low evergreen shrubs, with thick rather fleshy imbri- 

 cated narrow leaves, and solitary terminal erect peduncled white or pink flowers. 

 Calyx 2-4-bracted at the base, the sepals oval, obtuse, somewhat rigid. Corolla 

 campanulate, tardily deciduous, 5-lobed, the lobes obtuse. Stamens 5, inserted at 

 the sinuses of the corolla; filaments short and broad; anther-cells pointed, divergent, 

 obliquely 2-valved; staminodia none. Style slender; ovules numerous in the cells, 

 anatropous. Seeds oblong-cubic, the testa close, reticulated. [Greek, by fives, 

 alluding to the stamens and corolla-lobes. J Two species, the following, the other 

 Himalayan. 



1. Diapensia Lapponica L. Diapensia. (I. F. f. 2802.) Glabrous, forming 

 cushion-like tufts; stems 2-8 cm. high. Leaves crowded below, thick, spatulate, 

 sessile, often curved, entire, 6-12 mm. long, about 2 mm. wide; peduncles 2-5 cm. 

 long in fruit; sepals and bracts oval; corolla usually white, 6-8 mm. long; capsule 

 ovoid, 4-6 mm. high. Summits of the Adirondack Mts., and of the mountains of 

 N. Eng. ; Mt. Albert, Quebec; Lab. and arctic Am. Also in northern and alpine 

 Europe and Asia. June-July. 



2. PYXIDANTHERA Michx. 



A creeping tufted evergreen shrub, with small narrow alternate imbricated 

 leaves, and numerous white or pinkish sessile flowers, solitary at the ends of the 

 branches. Calyx bracted at the base, the sepals oblong, ciliate. Corolla short- 

 campanulate, 5-lobed, tardily deciduous. Stamens inserted at the sinuses of the 

 corolla; filaments broad and thick; anthers 2-celled, the sacs globose, transversely 

 2-valved, the lower valve cuspidate; staminodia none. Style columnar. Seeds 

 globose-oblong, amphitropous, the testa black, canceliate. [Greek, box-anther.j 

 A monotypic genus. 



1. Pyxidanthera barbulata Michx. Pvxie. FLOWERING Moss. (I. F. f. 

 280^.) Glabrous, or sparingly pubescent, growing in mats or large patches. 

 Leaves sessile, linear, lanceolate or linear oblong, acuminate or sufeulate tipped, 



