XXiv INTRODUCTORY LESSONS. 
bloom atatime. A dense Spike, 
bearing a ring of flowers be- 
tween growing ovaries below 
and expanding buds above, is 
shown in Fig. 61. The coiled spike (Fig. 64) is 
really a kind of cyme, as has been shown. This 
Scorpioid Inflorescence is characteristic of two 
families of plants, represented by many plants on 
this coast. Mosquito Bills (Fig. 62) grow in Brac- 
teale Umbels. The Head or Capitate cluster (Fig. 63) 
, is hke an umbel, only the pedicels are mostly very 
short. When the flowers are numerous, the head 
becomes Globose. The true clovers have capitate 
| flowers. When the pedicels in a raceme branch so 
iy as to bear two or more flowers each, a Compound 
Raceme is formed. So in like manner Compound 
Umbels, Spikes, and Corymbs may be formed. These 
flower bunches, cymes, racemes, etc., may be at the ends of 
main stems or branches, or in the axils of leaves, or replace 
single flowers:in any kind of inflorescence. 
The Calyx, as we have already learned, is composed 
of leaves called Sepals, which, though different from ordinary 
leaves in shape, are usually green. When the sepals are separate, the 
flower is Polysepalous. Sepals united partly or wholly form a Gamo- 
sepalous calyx. If the sepals drop off when the flower opens, as shown 
on p. 20a, they are Caducous. If they fall with the petals, or before the 
fruit is ripe, they are Deciduous. A Persistent Calyx remains until the 
