123. Petiole forming a split sheath which incloses a part of the stem 

 upward from a node. Leaves somewhat widened at their junc- 

 tion with the sheath. Styles two, or rarely three. Embryo of 

 the seed at the side of the albumen, near the base. Anthers 

 versatile. Stem usually hollow, with swelled nodes. 



GRAMINE.E. p. 353. 



Sheath not split. Leaves not enlarged at their junction with the 

 sheath. Embryo of the seed very small, included in the albu- 

 men at base. Filaments attached to the bases of the anthers. 

 Stem solid, often two edged or triangular, with few nodes, and 

 these seldom enlarged. CYPERACB^E. p. 352. 



RHIZANTHS. 



124. Ovule single, or ovules few. Ovary with one, two, or three 



cells. Styles one or two. BALANOPHORACE.E. 

 Ovules numerous. 



Anthers opening by slits. Ovary one celled. CYTINACE.K. 

 Anthers opening by pores. RAFFLESIACE.E. 



CRYPTOGAMIA. 



The following words are much used in speaking of cryptogamous 

 plants : 



Antheridium, organ corresponding to the anther of a flowering 

 plant. 



Antherozoids, cells emitted by the antheridium, which are fur- 

 nished with vibratile cilia, whereby they move themselves in 

 water, these minute cells being designed for an office similar to 

 that of pollen. 



Archegonium, organ corresponding to the ovary of a flowering 

 plant. 



Carpospores, spores formed after the general fertilization of the 

 fruit-bearing organs. 



Ouspores, spores formed by direct fertilization of ovule-like cells. 



