
LETTUCE, Crisp Heading, Continued 
Muckland (b.s.). A special selected variety of the Imperial class, par- 
ticularly suitable for raising on muckland. It is a medium size let- 
tuce and medium to dark green in color. Rather frilled wrapper 
leaves. It is considered resistant to tip-burn and stands well. 
Imperial No. 17 (b.s.). This is a new variety originated by Dr. Whitaker 
for the U. S. Department of Agriculture and released by them. De- 
veloped primarily for the dry packers on the Pacific Coast. A late 
lettuce under Pacific Coast winter conditions, it takes from 110 to 
120 days to mature. In the Imperial Valley, where it is largely 
used, planted in October it will mature in from 120 to 130 days 
and will come in in late January. It is dark green in color, grows 
in a spiral shape, has a very square base, makes a very fine head, 
well covered, resistant to cold weather, it has become quite a 
popular variety with the shippers who pack their lettuces in the 
field. 
Imperial No. 44 (w.s.) (Derived from Imperial 152). Plant medium 
green, leaves long and well folded. Produces a good size head, 
solid, splendid for long distance shipping. Succeeds well in warm 
weather and is not very susceptible to tip-burn. Is used very ex- 
tensively in the East and South. 
Imperial No. 101 (w.s.). Plants dark green, vigorous. Outer leaves are 
abundant and of a stout texture, coarsely crumpled. Heads are 
large and a little flat, of excellent quality, rather larger than No. 
615. Does best in the cool weather, used for midwinter harvest in 
the Imperial Valley and for spring harvest in the Central Coastal 
area of California. Principally used on the Pacific Coast. 
Imperial No. 152 (w.s.). Plant light green and of a spreading habit. 
Outer leaves are long, the head firm, round and exposed; a very 
sure header. Suitable for late summer planting in the Western 
states. It is resistant to brown blight but fairly susceptible to tip- 
burn. 
Imperial No. 456 (Cornell No. 456) (w.s.). Plant medium dark green. 
Heads are medium size, dark green, frilled and a little flat. Selected 
at Cornell University for growing in the summer months in the 
oars Does well on muck soil, is very resistant to tip-burn, slow 
olting. 
Imperial No.615 (w.s.). Plant dark grayish green, leaves quite smooth 
and rather thick. Large heads well folded and firm when grown in 
cool weather. Used for mid-winter harvest in the Imperial Valley 
and for spring harvest in Coastal California. Resistant to brown 
blight and does not tip-burn except when grown in warm weather. 
A heavy yielder and much used on the Pacific Coast. 
42 
Days to 
Maturity 
from Seed 
82 
95-100 
84 
85 
82 
82 
83 
