XXIY 



INTRODUCTORY LESSONS. 



bloom at a time, 

 bearing a ring 

 tween growing 

 and expanding 



A dense Spike, 

 of flowers be- 



ovaries below 

 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- 



teate Umbels. The Head or Capitcde cluster (Fig. 63) 



is like 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 



as to bear two or more flowers each, a Compouhd 



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 rejilace 



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 

 shape, are usually green. "When the sepals are separate, the 

 Polijsepalous. 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 



leaves in 

 flower is 



