38o 
HOWARD B. FROST 
One of the most interesting of all the mutant types is a gigas-type, 
designated "large-leaved" (fig. i). This has leaves longer and thicker 
than those of the Snowflake type, with stout stem and capsules, and is 
late in blooming. About half of its progeny reproduce its type, while 
nearly all the rest are Snowflake. Evidence is not yet at hand to 
explain the deviation from the expected seventy-five percent of 
large-leaved progeny, though there are several evident possibilities. 
The Large-leaved and Narrow-dark-leaved Types 
Fig. I. Matthiola plants at Riverside, California, in 1914-15. Progeny of a 
Large-leaved parent. Types, from left to right; Snowflake, Large-leaved, Narrow- 
dark-leaved. Observe especially the lateness of the Large-leaved plant (it should 
be noted that this type has seenied to seed quite as freely as Snowflake when grown 
to maturity under favorable temperature-conditions). 
The smooth-leaved type (fig. 2) was named from the lack^ of 
buckling between the main veins in the leaves of young seedlings 
grown in the greenhouse. In field cultures, with injuriously high 
temperature and at times deficient moisture, the leaves become dotted 
with small brown spots. Flowering is late, and the mature stems are 
brittle. Probably the fibrovascular system is in some way defective. 
The crenate-leaved type (fig. 3) has more crenation or serration of 
the leaf-margins than has Snowflake, under some conditions much 
