Botanical Survey of India | Flora of India

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1a. Annuals of biennials; stems tall, 20-250 cm tall, erect, corymbosely or paniculately branched 2
b. Annuals; stems short, 4-50 cm high, suberect, dichotomously branched 5
2a. Leaves uaually runcinate-pinnatitid, spinulose-toothed. sharply lobed, oblong-ovate or orbicular, rarely lanceolate 3
b. Leaves usually entire or sparingly 1/2 pinnatifid or lobed. very long, lanceolate or linear-lanceolate 4
3a. Leaves succulent, entire or minutely spinulose toothed; beak of achene twice longer than the body 4. Lactuca sativa
b. Leaves non-succulent, usully runcinate-pinnatifid, finely spinulose-toothed; beak slightly longer than body or equalling the body 5. Lactuca serriola
4a. Leaves sagittate at the base; achenes elliptic or oblanceolate 2. Lactuca dolichophylla
b. Leaves not sagittate at base; achenes very flat, somewhat rounded or ellipsoid 3. Lactuca indica
5a. Heads 1-1.2 x 0.3-0.4 cm; achenes 6-7 mm long including the capillary beak 1. Lactuca dissecta
b. Heads 1.7-2.2 x 0.4-0.5 cm; achenes 13-14 mm long including the capillary beak 6. Lactuca undulata

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