Xo. 56S] X CAP SELLA BU RSA-V ASTOB1S A RACJIXOIDEA 19? 



single individual which, while closely resembling the form 

 araciutoidea, differed from it in having somewhat spatu- 

 late leaves. This plant, a plant of arachnoidea and two 

 of Setchelliana, are shown in Fig. 2. 



After photographs had been taken, the plants were 

 potted and placed in the frames. None of the plants 

 made a growth as vigorous as that of the Capsellas grow- 

 ing in the open. The plants of the form arachnoidea de- 

 veloped leaves with a greatest length of 15 mm. and a 

 greatest width of a little over 1 mm., causing the plant to 

 retain its spider-like appearance. The roset with spatu- 

 late leaves appeared somewhat more vigorous, the aver- 

 age leaf measuring 22 mm. in length, with- a greatest width 

 of 2.5 mm. In later generations I have been able to ob- 

 tain rosets of arachnoidea with a greatest leaf-length of 

 100 mm. and a greatest width of 6 mm. 



In the frames, flowering shoots made their appearance, 

 those on araciutoidea being remarkable chiefly because of 

 their small size, reaching a length not exceeding 12 cm. 

 The flowers were small but well-formed. No well-devel- 

 oped pollen could be demonstrated. Seed did not form 

 and the capsules retained their original form, typical of 

 non-fertile capsules in Capsella Bursa-pasioris, remind- 

 ing one of the capsules of Capsella Heegeri. They do not 

 resemble the fertile capsules of C. procumbens. In the 

 next generation I saw a single capsule formed on arach- 

 noidea as the result of cross-fertilization, and in this case 

 it differed in no manner from the normal capsule such as 

 we know it in Capsella Bursa-pastoris. 



The "normal" plants, i. e., all those not belonging to 

 the form arachnoidea. matured a large amount of seed. 

 No measures were taken to prevent cross-pollination, but 



of twenty feet, was in flower. 



At this time, another attempt was made to group the 

 plants. It was found that the criterion used earlier, i. e., 

 the incision of the blade, no longer could be relied upon, 

 since plants, which at the time of the previous count, had 

 shown an entire margin, now were more or less incised. 



