Difference between revisions of "Lactuca graminifolia"
Fl. Bor.-Amer. 2: 85. 1803.
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|tribe=Asteraceae tribe Cichorieae | |tribe=Asteraceae tribe Cichorieae | ||
|genus=Lactuca | |genus=Lactuca | ||
Latest revision as of 19:51, 5 November 2020
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. Phyllaries 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.
Phenology: Flowering (Feb–)Apr–Jun(–Sep).
Habitat: Sandy ridges, pine forests, canyons
Elevation: 10–1700 m
Distribution
Ala., Ariz., Colo., Fla., Ga., La., Miss., N.J., N.Mex., N.C., S.C., Tex., Mexico (Chihuahua), Central America.
Discussion
Plants in the western populations of Lactuca graminifolia have been called L. graminifolia var. arizonica McVaugh; they may belong to a Mexican species.
Selected References
None.