SUPPLEMENT. 
THE FAMILIES OF FLOWERING PLANTS. 
By Crarirs Louts Ponwarp. 
CHAPTER II]. 
Class Angiosperiac.—From Screw-pines to Tape-grass. 
E have already discussed and explained the differences be- 
tween the two classes of flowering plants known as Angios- 
permae and Gymnuspermae (see Supplement, page 4). (‘The 
Angiospermae are divided into two general sections, each of which 
may be easily recognized, and which are of such importance that their 
names and characters should be memorized: 
1. MonocoryLepons. Plants that produce 
on germination a single seed-leaf or cotyledon. 
Leaves for the most part with veins running 
from base to apex, or from midrib to margin 
in parallel series. Part of the flower nearly 
always in threes or some multiple of three. 
Wood of the stem with no annual rings or lay- 
4 ers. Examples, palms, lilies, grasses, sedges. 
From Coulter's « Plant Relations.” (See Fig. 10.) 
REN ae UBIO C8 2. DicoryLepons. Plants that produce 
soe. RA el ee on germination usually two seed-leaves or co- 
cross-section, with the seat- tyledons. Leaves with reticulated or netted 
tered bundles. ; 
veins. Parts of the flower rarely in threes, 
mainly in or fives fours, or some multiple of these numbers. Wood 
of the stem with marked annual rings or layers. Examples, maples, 
elms, buttercups, daisies, peas. (See Fig. 11.) 
The great mass of our northern vegetation, including almost all 
‘the native trees, belongs to the second class. The Monocotyledons 
are the simplest and lowest of the flowering plants; this is proven not 
only by their structure, but by the fact that in past geological time 
