Vaccinium oxycoccos L.
Small cranberry
The small cranberry likes acidic bogs, like its cousin the large cranberry.
Plants: Small cranberries form mats of tiny shrubs only a few centimeters in height.
Leaves: Leaf edges are
rolled under. Leaves are opposite, roughly oval (ovate), wider at the base, pointed at the tip.
Flowers: Dark pink, and four-petaled, with the petals bending way back to the stem (”reflexed”).
Fruits: Less than ½″ (1.3 cm) in diameter, while large cranberries are
more than ½″ (1.3 cm) in diameter. Both are deep red when ripe.
Habitats: Acidiic bogs and fens in moist forest habitats.
Small cranberry leaves are curved. From dic.academic.ru. 
This Vaccinium comparison chart also includes a couple of similar-appearing species
that are not Vaccinium.
Edibility: Fruit is edible, raw or cooked, although it is very tart
when raw. The tartness is usually tempered with sugar.
Medical:
Online References:
Oxycoccus hagerupii Á. Löve & D. Löve
Oxycoccus intermedius (A. Gray) Rydb.
Oxycoccus microcarpos Turcz. ex Rupr.
Oxycoccus ovalifolius (Michx.) A.E. Porsild
Oxycoccus oxycoccos (L.) MacMill.
Oxycoccus oxycoccos (L.) Adolphi
Oxycoccus palustris Pers.
Oxycoccus palustris Pers. var. intermedius (A. Gray) Howell
Oxycoccus palustris Pers. ssp. microphyllus (Lange) Á. Löve & D. Löve
Oxycoccus palustris Pers. var. ovalifolius (Michx.) Seymour
Oxycoccus quadripetalus Gilib.
Oxycoccus quadripetalus Gilib. var. microphyllus (Lange) A.E. Porsild
Vaccinium microcarpos (Turcz. ex Rupr.) Schmalh.
Vaccinium oxycoccos L. var. intermedium A. Gray
Vaccinium oxycoccos L. var. microphyllum (Lange) J. Rousseau & Raymond
Vaccinium oxycoccos L. ssp. microphyllum (Lange) J. Feilberg
Vaccinium oxycoccos L. var. ovalifolium Michx.

See the frog? · 9/20/2009 · Wild Gardens of Acadia, Acadia National Park, Bar Harbor, Maine · ≈ 12 × 17″ (29 × 44 cm) 

9/20/2009 · Wild Gardens of Acadia, Acadia National Park, Bar Harbor, Maine · ≈ 1½ × 1′ (52 × 34 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Ericales | Tea, persimmon, blueberry, Brazil nut, azalea, many others |
| Family | Ericaceae | Heath or heather family |
| Genus | Vaccinium | Ancient Latin name for billberry |
| Species | oxycoccos | Old Latin name for “acid-berry” |
About plant names...
Vaccinium oxycoccos description by Thomas H. Kent, not updated.
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