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Lactuca sativa var. capitata

Authority	L.
Family	Magnoliopsida:Asteridae:Asterales:Compositae
Synonyms	Lactuca sativa
Common names	butter-head lettuce, cabbage lettuce, crisp-head lettuce, garden lettuce, head lettuce, lattich, lattuga, letisi, lettuce
Editor
Ecocrop code	1313

Notes
BRIEF DESCRIPTION A herb with succulent leaves growing from basal rosette often forming heads, followed later by a flowering stalk. USES Used almost exclusively as a fresh, raw salad vegetable. KILLING T Mature plants -1°C, seedlings -6°C. GROWING PERIOD Annual or biennial, growing 35-70 days for leaf lettuce and 60-85 days for head lettuce. COMMON NAMES Lettuce, Garden Lettuce, Celtuce, Letsugas, Laitue, Laituc, Lechuga, Salat, Sia. FURTHER INF Lettuce is native of the Mediterranean region. It is grown in the low land in temperate and subtropical areas and elevations above 1000 m in the tropics provide good conditions for optimal production of lettuce. However, cultivars adapted for tropical lowland conditions have been selected, but high temperatures often result in stunted growth and bitter leaves. A good content of organic matter is desirable and humidity should be medium to high. Seeds need exposure to light to germinate. Yields may be 5-15 t/ha or 0.5-1.5 kg/m˝.
Sources
SOURCES (L. sativa L.) Sims D (pers. comm.) Roecklein J 1987 pp 492 [USE, RAIN, FER, TEXT] Dube P 1982 pp 30 Eswaran H 1986 pp 8 16 54 73 87 Duke J 1979 pp 109 [PH, RAIN, TEMP] Rice R 1990 pp 237-239 [PH, TEMP, PHO] Hartmann T 1981 pp 563-567 [TEMP, TEXT, FER, DRA] Tindall H 1983 pp 89-92 [TEXT, PH, TEMP, PHO] Hackett C 1982 pp 60 [FER, PHO, DEP, PH, TEXT, TEMP] Purseglove J 1974 pp 74-77 [TEMP, TEXT, FER, DRA] Martin F 1984 pp 172-174 [TEMP, RAIN, PHO, FER, TEXT, LIG, USE] Siemonsma J 1993 pp 186-190 [TEMP, PHO, TEXT, FER, DRA, PH, USE]