160 
ORGANOGRAPHY. 
BOOK I. 
merocallis flava, Tradescantia, Strelitzia, Lamium, Cornus, 
Syringa.) 
VI. The Thyrse* * * § is an inflorescence at first centri- 
petal, afterwards centrifugal. (Tamus, Delphinium, La- 
burnum.) 
VII. The Sarmentidium f is an inflorescence of which 
the first evolution is centrifugal: its partial inflorescences 
may belong to either of the four previous forms. (Cichorium 
Intybus, Vitis, Geranium molle, Asclepias.) 
VIII. The cyme of Monocotyledons appears to be typi- 
cally uninodal\\ it is helicoid^, or ||, according as 
its peduncles are homodromal **, or antidromal.\\ It may be 
hinodal f , trinodal multinodal f , in its first ramifications ; 
but it has a tendency to become uninodal in its ultimate 
ramifications. 
IX. The cyme of Dicotyledons is binodal, or multinodal ; 
the second is sometimes a simple variety of the first. In the 
binodal cyme one of the nodes is homodromal, the other 
antidromal. These nodes have usually an unequal tendency 
to develope ; if the homodromal node causes the abortion of 
its antagonist, the cyme becomes by degeneration helicoid, 
and scorpioid in the opposite case. The multinodal cyme 
offers no fixed rule in the spirals of its nodes ; it gene- 
rally finishes by degenerating into little binodal few-flowered 
or one-flowered cymes. We therefore may consider the bi- 
* A group of cymes disposed centripetally, as the flowers are in the 
spike. 
f A group of cymes or spikes arranged centrifugally, as the flowers 
are in the cyme. 
J According as the peduncles bear 1, 2, or a variable number of nodes. 
§ Where the flowers are arranged in succession in a spiral around a 
pseudothallus (or axis of uniparoiis, that is one-peduncled, cymes, or sar- 
mentidia, formed by a series of successive peduncles, fitted into each other 
in such a way that they seem to form but one and the same stalk, as in 
Hemerocallis fulva). 
II Where the flowers are arranged in two rows parallel to the axis of 
the pseudothallus, as in Canna indica. 
** Where the direction of a spire is the same as on the central stem. 
f f Where the direction of a spire is the reverse of that on the central 
stem. 
