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(Last Modified On 5/10/2013)
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(Last Modified On 5/10/2013)
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Species
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Phyla incisa Small
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PlaceOfPublication
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Fl. Southeast. U. S., ed. 1. 1012 & 1337. 1903.
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Synonym
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Lippia cuneifolia var. incisa (Small) Blankinship, Annual Rep. Missouri Bot. Gard. 18: 186. 1907. Lippia incisa (Small) E. D. Schulz, Texas Wild Fls. 339. 1928.
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Description
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Perennial herbs; stems mostly prostrate, often swollen and rooting at the nodes, slender, obtusely tetragonal, simple or branched, often purplish, densely or sparsely appressed-strigillose with small white trichomes; branches often numer- ous, decumbent to ascending or erect, mostly slender, tetragonal, abundantly appressed-strigose with small white trichomes; principal internodes 1.8-5 cm long. Leaves often with a cluster of smaller ones in their axils, variable in shape and size, the blades firmly chartaceous, often thick-textured, uniformly green on both surfaces, narrowly oblong or cuneiform to broadly obovate, 1-5 cm long and 2-15 mm wide, acute to obtuse or rounded apically, cuneate basally, sparsely or abundantly dentate above the middle, sparsely or densely appressed-strigillose with small, inconspicuous white trichomes on both surfaces; petioles usually obsolete or only 1-3 mm long. Inflorescences 1 or 2 per node, erect, heads at first globose, later cylindric and elongating to 3 cm, 5-7 mm in diameter; peduncles slender, tetragonal, 2-9 cm long, appressed-strigillose; bractlets obovate, 2-3 mm long, acute, abundantly white-strigillose. Flowers with the corolla white with a yellow center, the tube 2-2.5 mm long, the limb ca. 2 mm wide. Fruits obovoid. n = 18.
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Habit
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herbs
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Distribution
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In open ground, clay or sandy fields, in dried-up depressions, stream- or lake- beds, waste ground, and along roadsides, seashores, and watercourses, from Colorado, Kansas, and Arkansas, west to southern California, east to Georgia, and south through Mexico to Panama; introduced in Iran.
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Note
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An extremely variable and polymorphic species, apparently hybridizing readily with related species.
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Specimen
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CANAL ZONE: Common on flat near river, Fort San Lorenzo, McDaniels 5173 (MO). COLON: Edge of canal, Colon, Asplund, 12 June 1920 (S).
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