XXIV 



INTRODUCTORY LESSONS. 



bloom at a time. 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 Brae- 

 teate Umbels. The Head or Capitate 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 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 Folysepalous. Sej^als 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 



