158 



BOTANY. 



stamens ((7, D). While the individual flowers are destitute 

 of a perigone, the whole inflorescence (cluster of flowers) is 

 surrounded by a large leaf (spathe), which sometimes is bril- 



FIG. 86. Types of Spadiciflorse. A, inflorescence of Jack-in-the-pulpit 

 (Arissema, AroidesR). The flowers (fl.) are at the base of a spike (spadix), 

 surrounded by a sheath (spathe), which has been cut away on one side in 

 order to show the flowers, x y 2 . B, leaf of the same plant, x y 4 . C, vertical 

 section of a female flower, x 2. D, three male flowers, each consisting of 

 four stamens, x 2. E, two plants of a duck-weed (Lemna), the one at the 

 left is in flower, x 4. F, another common species. L, Trisnlca, x l. G, 

 male flower of E, x 25. H, optical section of the female flower, showing the 

 single ovule (o?>.), x 25. /, part of the inflorescence of the bur-reed (tipar- 

 yanium), with female flowers, x % (Tj/phacese). J, a single, female flower, 

 x 2. K, a ripe fruit, x 1. L, longitudinal section of the same. M, two male 

 flowers, x 1. N, a pond-weed (Potomoc/eton) , x 1 (Naiadacesz) . O, a single 

 flower, x 2, P, the same, with the perianth removed, x 2. Q, fruit of the 

 3, x 2. 



liantly colored, this serving to attract insects. The leaves of 

 the aroids are generally large and sometimes compound, the 

 only instance of true compound leaves among the monocoty- 

 ledons (Fig. 86, B). 



