120 OBJECT LESSONS IN BOTANY. 



the circles of petals common in other flowers. Hence we 

 have a class of Glume-plants and of Glumeless-plants, or, as 

 the botanists say, GLUMIFER.E and PKTALIFER^E. Thus we 

 divide all the Flowering Plants into four Classes, viz.: 



1. Angiospernis / Exogens bearing stigmas and seed-vessels. 



2. Gymnosperms j Exogens with no stigmas, and with naked 

 Becds, as the Pines, Firs, Larches, Cedars, Cypresses, Yews, &c. 



3. Petaliferce ; Endogens with no glumes and ordinary 

 flowers. 



4. Glumiferce / Endogens with glumes instead of petals, as 

 the Grasses, Sedges. Grains. 



258. Again, each of these Classes are to be subdivided into 

 Cohorts, as follows : the Angiospernis are divided (not very 

 naturally) into three cohorts, viz. : 



1. The Dialypetalce, or Polypetalous Exogens, having flow- 

 ers with the petals distinct and separate, as in the Buttercup, 

 Rose, Mustard. 



2. The Gamopetaloe, having flowers with the petals united 

 into one piece, as in the Phlox, Morning-glory, Foxglove. 



3. The Apetalce, having flowers without petals, either 

 naked, or with only one circle of floral envelopes (which must 

 then be considered as sepals, whatever be the color) ; as Gin- 

 ger-root (Asarm/i), Poke (Phytolacca\ and Pig-weed (C/ieno- 

 podiuni). 



4. Next, the Gymnosperms are regarded as forming one 

 cohort, called the Conoids, having the fruit usually in conee. 

 (Less. XXIII.) 



258 After the classes, what is the next step in analysis? How are tie 

 Angiosperms subdivided ? Please define the Polypetalous Exogens ; the 

 Gamopetalous; the Apetalous. What cohort do the Gymnosperms form? 

 Why ? What two cohorts do the Petaliferous Endogens form ? Define the 

 fifth cohort. Define the sixth cohort. What cohort do the Glumiferons 

 Eudogens constitute ? 



