FAMILIES OF PLANTS 4 ? 
interested in distinguishing the different kinds. Therefore, those 
that have been identified in the park are merely listed below: 
Salix anglorum 
Salix barcleyi 
Salix bebbiana var. perrostrata 
Salix chlorophylla 
Salix eordata 
Salix dodgeama 
Salix exigua 
Salix fendleriane 
Salix fluviatalis 
Salix geyeriana 
Salix glauca var. glabrescens 
Salix lasiandra 
Salix macTcenziana 
Salix nivalis 
Salix petrophila 
Salix pseudomonticola 
Salix pseudomyrsmites 
Salix saximontana 
Salix scouleriana 
Salix strict a 
Salix subcaerulea 
Salix tenera 
Salix wolfii 
BIRCH FAMILY (BETULACEAE) 
A small family of trees and shrubs with alternate, toothed leaves 
and flowers in catkins. It is found mostly along streams. The edible 
hazelnuts belong to this family. 
Red birch ( Betula fontinalis) is a large shrub or small tree with 
smooth, dark bark and ovate, toothed leaves. The bracts of the fruit 
cluster are three-lobed, and the cluster falls apart easily at maturity. 
Mountain bog birch ( Betula glandulosa) , a low shrub 6 or 8 feet 
high, also occurs in the park. Also known as Resin birch. 
Mountain alder ( Alnus tenuifolia) is often found in the same situa¬ 
tion as the birch. The leaves have larger teeth, which are often 
double. The bracts of the fruit cluster are not lobed, and the cluster 
does not fall apart even at maturity. 
MISTLETOE FAMILY (LORANTHACEAE) 
A small family of evergreen plants that are parasitic on trees or 
shrubs. They contain some chlorophyll and manufacture their own 
carbohydrates, but obtain water and mineral salts from the plants on 
which they grow. The family is represented in the park only by the 
Mistletoe (Arceuthohium americanum) which is parasitic on lodge- 
pole pine and sometimes on limber pine. This little mistletoe is the 
cause of the malformations on the pine trees that are called “ witches 
brooms. 5 ’ 
SANDLEWOOD FAMILY (SANTALACEAE) 
A small family of plants with relatively inconspicuous flowers of 
which our only representative is the Comandm 'pallida. This is a 
low, smooth, perennial herb with small, alternate, sessile leaves and 
greenish-white or purplish flowers. The stems are 4 to 8 inches 
high and grow at more or less regular intervals from an under- 
