LAMARCKIANA SEMIGIGAS. 567 



self-fertilization. It, however, had long, very narrow, and almost 

 linear leaves. 



Prototype liquida. — The plants of this group constituted a very 

 uniform type, which could be compared with a culture of 0. liquidax 

 Lamarckiana mut. velutina, and was found to be almost identical 

 with it, in the rosette stage as well as during the period of flowering. 

 The root leaves are lanceolate, longer and narrower than those of 

 the pure race of liquida, and pressed to the ground so as to form 

 a dense rosette. The flower spikes were dense like those of the race, 

 with numerous long and somewhat thin buds and stout fruits. In 

 the culture of the race of liquida outside of the glass covered part 

 of the garden the color was brownish, but in a specimen in that 

 part and in the mutants the young organs were almost a pure green. 

 Seven of the plants had only one chromosome doubled; in the two 

 other plants two nuclear rods were in this condition. One of them 

 did not produce a stem; it had long petioles and very pointed leaf 

 blades; the other was almost equal to the typical specimens of the 

 group. On the flowering plants the pollen was abundant, and artificial 

 fertilization was always easy and successful. 



Prototype spathulata. — Almost circular leaf blades on long and 

 erect petioles are characteristic of this group during the stage of 

 rosettes, and make it easily recognizable. This type of leaves is fol- 

 lowed by the spathulate form as soon as the stem begins to develop. 

 In the individuals with 15 chromosomes the root leaves were pale 

 green; in the others they had a darker tinge and were usually more 

 or less bent against the soil. As a rule the plants in this group were 

 weak. Only those four which had 15 chromosomes flowered, but 

 none of them has produced sufficient pollen for artificial self-fertili- 

 zation. Among those with 16, 17, and 18 nuclear rods, three could 

 produce only low stems and four remained in the condition of 

 rosettes. 



In the outward features of their inflorescences, the four plants 

 with the normal number of chromosomes were almost exactly like 

 the specimens of the pure race of 0. spathulata. We also had a biennial 

 plant of spathulata xblandina, which flowered richly, but did not 

 show striking differences from the pure mutant. 



The two plants of hamata were only recognized as such at the 

 time of flowering, and could be compared with 15 typical specimens 

 of the fifth generation of the pure, dimorphic race of the same name. 

 No real differences were observed. 



Type pulla (fig. 2). — Of the ten plants of this form, nine were 



