and Laboratory Methods. 2093 



LXXXII. Catalpa speciosa Warder. 



Class, Dicotyledones. Order, Polemoniale. Family, Bignoniaceae. 



The Catalpa is cultivated extensively and blooms abundantly in May and June. 



1. Study the large compound panicle and draw a single flower. 



2. Describe the flower carefully, noting the condition of each floral set and 

 whether the flower is hypogynous or epigynous. whether actinomorphic or zygo- 

 morphic. What adaptations for insect pollination ? Note especially the rudi- 

 mentary or vestigial stamens. 



3. Cut cross sections of the ovulary, mount, and draw. How many carpels 

 in the gynoecium ? 



4. Make two diagrams of the flower, showing transverse and longitudinal 

 arrangement. 



LXXXII I. Conius candidissima Marsh. Panicled Dogwood. 



Class, Dicotyledones. Order, Umbellales. Family, Cornaceae. 



This common shrub usually forms thickets, in forests and on hillsides. It 

 blooms in June, producing an abundance of flowers. 



L Sketch the entire inflorescence and note the arrangement of the numer- 

 ous small flowers. 



2. Under dissecting microscope draw a single flower. How many cycles ? 

 How many stamens, petals and sepals? Note the minute size of the calyx. 



3. Cut a cross section of the ovulary. Draw under low power. How many 

 carpels .-' Note that the flower is epigynous. 



4. Make a transverse and a longitudinal diagram of the flower. See Fig. 

 15 e. and f. 



LXXXIV. Ageratum conyzoides L. Ageratum. 



Class, Dicotyledones. Order, Asterales. Family, Compositae. 



Ageratums are annuals which bloom all summer and are much used for 

 borders. The flowers may be had in the greenhouse at any time of the year. 

 The plants will live and bloom for a long time. 



L Sketch one of the heads under dissecting microscope, showing the bracts 

 of the involucre and the numerous small tubular flowers. 



2. Under dissecting microscope draw a single flower. What is the condi- 

 tion of the pappus ? What does the pappus represent ? 



3. Dissect the flower and draw the corolla, the andrtccium and the gynoe- 

 cium under dissecting microscope or low power. Describe the flower and its 

 parts in detail. 



LXXXV. Chrysanthetnum leucanthemum L. Ox-eye Daisy. 



Family, Compositae. 



This plant grows in fields and meadows and blooms in May and June. 



1. Draw one of the heads, showing the bracts of the involucre, the ligulate 

 or ray flowers and the tubular or disc flowers. 



2. Under dissecting microscope draw a ray flower and a disc flower. 



