Nabalus asper (Michx.) Torr. & A. Gray

Rough White Lettuce

Nabalus asper plant

Family - Asteraceae

Stem - To 170 cm long, slender to stout, hairy.

Nabalus asper stemStem and leaves.

Leaf - Roughened, abaxially pubescent, sessile to petiolate, lanceolate to oblong-elliptic. Margins entire or shallowly toothed or lobed.

Nabalus asper leafLeaf.

Inflorescence - Narrow, cylindrical spikelike panicles or racemes.

Nabalus asper inflorescenceInflorescence.

Involucre - 12-17 mm long, +/- cylindrical, coarsely hairy.

Nabalus asper involucreInvolucres.

Flower - Ligulate florets 11-14, white to pale yellow, with 6-8 mm pappus of straw-colored bristles.

Nabalus asper flowerFlowers.

Fruit - Achenes 5-6 mm long, yellowish brown.

Flowering - August - October.

Habitat - Prairies, glades, openings of mesic to dry upland forests, savannas.

Origin - Native to North America.

Other info - This striking species is similar to N. crepidineus, but the inflorescence is much narrower. Also, the preferred habitat is drier and more open than that of N. crepidineus.
A former name for this species was Prenanthes aspera Michx.

Photographs taken at Shaw Nature Reserve, Franklin County, MO, 9-8-2012, Tucker Prairie, Callaway County, MO, 8-21-2015, and Victoria Glade, Jefferson County, MO, 9-19-2016 (SRTurner).



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