18 : FLORAL ENVELOPES, “ 
* 
hereafter in treating of the Calyx in detail. At other times, as 
in the Ash (jig. 30), and Willow (figs. 34 and 35), both the 
floral envelopes are absent, when the flower is termed naked or 
Fie. 26.. Fic. 27. Fia. 28. _ 
Fig. 26. Flower of the Wallflower with the calyx and corollaremoved, in order 
to show the essential organs of reproduction. 7. Thalamus. gl. Glands. 
ec, ec. Stamens, of which there are six, four long and two short, the whole . 
forming the andrecium. sfi. Stigma, the summit of the gyncecium or 
pistil.— Fig. 27. One of the stamens of the Wallflower. j/. Filament. 
a. Anther. p. Pollen, whichis being discharged througha slit in the anther. 
—Fig.28. Flower of a species of Squill (Scilla italica). The parts com- 
posing the floral envelopes here closely resemb!e one another, and form 
collectively the perianth. 
Achlamydeous. When both floral envelopes are present the 
flower is said to be Dichlamydeous. 
The Andrecium constitutes the whorl or whorls of organs 
Fie. 30. 
Fic. 29. } 
Fig. 29. Flower of Goosefoot (Chenopodium), with only one floral envelope 
(monochlamydeous ).—Fig. 30, Flower of the common Ash (Frazcinus), in 
which both floral envelopes are absent (achlamydeous), 
situated on the inside of the corolla (fig. 26, ec, ec). Its parts 
are called stamens. Each stamen consists essentially of a case 
or bag, called the anther (fig. 27, a), which contains in its inte- 
