ALBERT AND OABRIKLLE HOWARD. 17 



more marked in some types than in othei's, but it is not visible in 

 the front view in eases where the limb is flat as the mar<>iji is 

 generally I'ecurved. In the description of the types this conditio]] 

 is described by the term '' apiculjB inconspicuous." 



In plate V are represented flowers showins^ the variations in 

 the structure described above. In Xo. o3 (t3^pe II) the calyx is 

 globular, the teeth short and obtuse, the flower mediunj in size 

 with a median constriction, and the coi-olla limb flat and very 

 slightly divided. In No. 83 (type XVIII) the flower is large, 

 the calyx loose and baggy and the corolla limb crumpled. In 

 No. 60 (type I) the flower is medium in size, with no median 

 constriction, the calyx is tubular with long, acute teeth and 

 prominent midrib, while the corolla limb is deeply divided and not 

 full}^ expanded. No. 19 (type Till) is an example of a slender 

 flower. The difterence in the shape of the buds is well seen. 



All gradations between the extreme cases figured in plate V 

 are found among the various types, and the determination of the 

 character of the flower is a matter of some difficult3\ The later 

 flowers are seldom reall}^ typical and are always much smaller, 

 while many flowers with slight abnormalities in the corolla are 

 found. 



Capsnle. — The capsules var}^ considerably in size. Tj'pes 

 VI & VII have the smallest capsules (Nos. 49 & 5 (m Piate V) 

 and type XVII (No. 75) the largest. The shape may be round 

 as in type XVIII (No. 83), conical as in type V (No. 40), or 

 cylindrical as in type XIII (No. 68). The apex ma}^ be rounded, 

 blunt or somewhat poiiited and maj' be more or less umbilicate. 

 As will be seen from the plate, the extent to which the capsule 

 is covered by the persistent calyx varies in the difterent types. 

 There is a certain amount of variation on this point, though 

 to a much smaller degree, in the capsules of each plant. Often 

 the persistent calyx is split longitudinally by the expanding 

 capsule. 



Scheme of Classification. 



In arranging the types in a provisional scheme the habit and 

 the nature of the inflorescence have been used as differentiating 



2 



