198 SYSTEMATIC BOTANY. 



ers perfect." The second line of this couplet is true of our plant. Next pass 

 to (&). The (7.) pupil reads "Anthers 3 or 6," which is true of the plant. 

 Pass to (c). (8.) " Perianth glabrous outside " is true. Next read (d). (9.) 

 " Anthers 3, opening lengthwise, outward," is also true, and our plant is thus 

 traced to the order IRIDACE.E. 



513. To determine the Q-enus and Species under the Irids, Order 146, is 

 the next and the last step. Having carefully compared their specimens with 

 the characters ascribed to the Irids, the pupils next apply to the Table of the 

 Q-enera. (10.) "Mowers regular and equilateral," in the first dilemma, is 

 chosen. Bead the (*) couplet next. (11.) " Sepals similar to the petals in 

 form, size, and position " is true. Next to (a). (12.) " Stamens monadelphous. 

 Elowers small, blue. Plants grass-like," describes the plant truly, and it must 

 be a Sisyrhinchium. They turn to G-enus 7, and verify by reading its char- 

 acters. Lastly, the brief diagnoses of the two species are compared, and the 

 plant is found to be S. Bermudiana. 



