198 LORANTHACEAE SANTALACEAE 
families. The flowers in all have a simple and single perianth 
which closely surrounds the ovary and on which are borne the 
stamens. 
In the Family Loranthaceae all the species are parasitic. 
In the Family Aristolochiaceae the species are of plants which 
find their home at the roots of decaying trees and are in some 
measure parasitic. 
Parasites on trees; fruit a berry. Famity I. LORANTHACEAE 
Plants not parasitic. . . . . Faminy IJ]. SANTALACEAE 
Parasites on roots or shrubs; fruit a nut. 
oe) Pe Psa Famity III. ARISTOLOCHIACEAE 
Famity I.—LORANTHACEAE. Mistietror FAmMILy 
Plants growing on trees as parasites, nourishing themselves 
through roots which penetrate the bark of the supporting tree. 
They have opposite leaves but these in Arceuthobium are reduced 
to thickened scales. Flowers at the end of the branches or in the 
leaf axils, generally in clusters. They have no colored perianth. 
Fruit a berry with a single seed. 
Leaves foliaceus .. “Sets 0 se ee ee Phoradendron 
eaves seale-like "= Eee se eee Arceuthobium 
1. ARCEUTHOBIUM, Bieb. (Razoumofskya, Hoffm.’ 
Small plants, parasitic on the conifers, branches 4 angled, opposite 
leaves scale-like. Berry globose, fleshy, on a short stem. 
A. pusillum, Peck. SMaALt Mistietor, Plant from 3 to 1 in. long, 
greenish-brown, leaf scales rounded; staminate and pistillate flowers on 
different plants which may grow from the same tree or from different 
trees. On twigs of spruce trees. Adirondack region, White Mountain 
and Pocono regions. 
2. PHORADENDRON, Nutt. 
Leaves leathery, flowers in jointed clusters, staminate and pistillate 
on different plants. Berry pulpy. Yellowish-green plants growing on 
other trees. 
P. flavescens, (Pursh.) Nutt. (Fig. 1, pl. 30.) AMeErIcAN MISTLE- 
TOE. Irregularly branching; leaves oblong, thick and leathery. Berries 
in clusters. New Jersey, southward and westward. 
Famity IJ—SANTALACEAE. Sanpatwoop Faminy 
Herbs and shrubs with alternate leaves (opposite in some 
foreign species) which have entire borders and are without stipules. 
Flowers in clusters or solitary, terminal or from the leaf axils, 
each flower with stamens and pistils, or flowers with one of these 
