Lactuca graminifolia Michx.
Family: Asteraceae
grassleaf lettuce,  more...
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Patrick Alexander  
Biennials, 25-90(-150+) cm. Leaves on proximal 1/3-1/2 of each stem; blades of undivided cauline leaves spatulate to lance-linear, margins entire or denticulate, midribs sometimes setose. Heads in ± paniculiform arrays. Involucres 12-20+ mm. Phyl-laries usually reflexed in fruit. Florets 15-20+; corollas bluish to purplish, usually deliquescent. Cypselae: bodies brown (often mottled), ± flattened, elliptic, 5-6 mm, beaks ± filiform, 2-4 mm, faces 1(-3)-nerved; pappi white, 5-9 mm. 2n = 34.
FNA 2006, Kearney and Peebles 1969, McDougall 1973
Duration: Perennial Nativity: Native Lifeform: Forb/Herb General: Herbaceous biennials to perennials, to 150 cm tall, glabrous, stems leafy, leaves crowded at the base, plants with milky sap. Leaves: Alternate, linear-attenuate or with a few linear-attenuate or lanceolate lobes, up to 30 cm long, the cauline leaves reduced. Flowers: Heads small, blue to purple, sometimes yellowish, radiate, the rays minutely toothed at the apices, involucres urn-shaped, to 2 cm long, phyllaries somewhat long, overlapping in 2 or more series, usually reflexed in fruit, inflorescences usually with an irregular branching pattern without a well-defined central axis (deliquescent). Fruits: Achenes strongly flattened, to 6 mm long, contracted into a beak with a disk at the apex, the body of the achenes much longer than the beak. Pappus of copious, early deciduous capillary bristles. Ecology: Found on sandy ridges, in pine forests and canyons, from 0-8,000 ft (0-2438 m); flowering May-October. Distribution: South Carolina to Florida, west to Arizona. Notes: Good identifiers for this species are the leaves mostly narrowly linear and entire, with the lower ones broad and pinnatifid along with the achene to 6 mm with a beak about half as long as the body. Ethnobotany: Unknown Etymology: Lactuca is Latin for milky sap, while graminifolia means with leaves like grass. Synonyms: Lactuca graminifolia var. mexicana Editor: LCrumbacher 2011
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Liz Makings  
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Liz Makings  
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Sue Carnahan  
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Sue Carnahan  
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Sue Carnahan  
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Sue Carnahan  
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Patrick Alexander  
Lactuca graminifolia image
Patrick Alexander  
Lactuca graminifolia image
Patrick Alexander  
Lactuca graminifolia image
Patrick Alexander  
Lactuca graminifolia image
Patrick Alexander  
Lactuca graminifolia image
Patrick Alexander  
Lactuca graminifolia image
Sue Carnahan  
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Arizona State University Herbarium  
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Jillian Cowles  
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Jillian Cowles  
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Jillian Cowles  
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Liz Makings  
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