ARUM FAMILY 109 
Order IIIL.—GLUMIFLORAE. Glumaceous Flowered Plants 
The order Glumiflorae includes the great families of grasses and 
sedges. The inflorescence is characterized by the dry, scale-like 
bracts, which are known as glumes. These glumaceous plants 
number, in our region, more than 400 species. Though of much 
interest as including some of the most valuable plants, the study 
of them is, to some extent, a speciality. Owing to the great num- 
ber of the species and with the view of limiting the extent of this 
work, these families are omitted. 
Order IV.—SPATHIFLORAE. Order of the Arums 
The order includes, in our region, only one family, Araceae. 
Famity I.— ARACEAE. Arum FaAmiIty 
Herbs bearing a fleshy spike which supports a large number of 
flowers, which are destitute of a perianth (a spadix). The spadix 
is enclosed by a sheath-like organ, the spathe. In Acorus the 
sheath appears like a continuation of the grass-like stem and does 
not wholly enclose the spadix. When the flowers are perfect, that 
is, when stamen and pistil are included in the same flower, the 
fleshy spike is surrounded by flowers which are alike on all parts 
of the receptacle. When some of the flowers are staminate and 
others are pistillate the former are on the upper part of the spadix, 
the latter below. The stamens are without filaments or with very 
short ones, and the styles are wanting to the pistils or are very 
short. 
Leaves divided into 3 or more segments . . . . Arisaema 
Leaves arrow-head shaped . . . oe) 2 Se beltandra 
Leaves egg-shaped, heart-shaped at base. 
Spathe (flower envelope) white . . . . . . Calla 
Spathe brown to yellow . . . . . . Symplocarpus 
Memestciinticn. 2c) “li he Va ae) “Orontvam 
Meemesmlone.. orase-like: 6. se Acorns 
1. ARISAEMA, Martius. (Arum, L.) 
Stem arising from an acrid, flattened, fleshy, bulb-like mass, a@ corm. 
Flower and leaf stems from the same base. Spadix consists of a column, 
