98 



ACADEMIC BOTANY. 



used in aestivation are nearly the same as in venation, there are these 

 exceptions : "We say of the parts of each set — sepal, petal, or lobe — 



that it is 



Convolute 

 when it envel- 

 ops all heneath 

 i t; petals o f 

 Ma g n 1 i a, 

 Camellia ; 



Con tor ted 

 (twisted) when 

 one edge over- 

 laps the next 

 beneath it ; pet^ 

 als of Mallow 

 (Pig. 13 4), 

 lobes of Moru- 

 ing-Glory ; 



Reduplicate 

 when valvate 

 and doubled 

 back ; sepals of 

 Mallow (Kg. 

 134); 



Supervolute 

 when plicate 

 lobes overlap 

 in a contorted 

 manner ; D a- 

 tura, James- 

 town-weed ; 



Vexillary (L. 

 vexillum, ban- 

 ner) when one 

 petal, much 

 larger than the 

 others, is spread 

 over them like 

 a banner, en- 

 closing them ; 

 Pea, Wistaria, 

 etc. 



207. Different sestivation in sepals and petals of the same flower is 

 quite frequent, as in the Mallow (Pig. 134). 



208. Inflorescence, or Flower-arrangement, relates not only to the 

 flowers on the stem of the plant, but also on the flower-stalk. Plower- 

 buds, like leaf-buds in regard to the stem, are Axillary (Pea, Wis- 

 taria) ; Terminal (Oleander); Latent; and Adventitious (Fig. 135). 

 One difference must be noted, however: The terminal and axillary 

 leaf-buds continue to grow year by year, developing into stems and 

 branches ; the flower-bud has nothing to do with this vegetative stem- 

 growth ; its sole function is to perform the work of reproduction ; 



Fia. 133. — Magnolia glauca. A, torus, allowing spirals of scars 

 left by the fallen stamens ; pistils in spirals on its apex. B, ripe 

 cone, with sds. hanging by cobwebby white threads. C, seed cut 

 open, showing small embryo, large perispei'm, Urge red aiilenvel- 

 opliig sd. 



