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(Last Modified On 8/15/2013)
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(Last Modified On 8/15/2013)
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Species
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Micranthemum pilosum Ernst,
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PlaceOfPublication
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Flora 57: 215. 1874.
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Note
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TYPE: Caracas, Venezuela, Ernst Nov. 1873 (B, if extant, not seen; photo US).
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Synonym
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?Micranthemum standleyi L. 0. Williams, Fieldiana, Bot. 34: 124. 1972. TYPE: Guatemala, Standley 68810 (F, US, neither seen).
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Description
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Diminutive floating or prostrate herbs; stems branching, glabrate, the nodes mostly shorter than the leaves; roots often arising from leaf- or flower-bearing nodes. Leaves opposite entire, orbiculate, ovate or elliptical, apically obtuse or rounded, basally cuneate obtuse; digitately 5-nerved, membranaceous or ?suc- culent; petioles mostly wanting. Inflorescences solitary flowers in the leaf axils; pedicels ca. 0.3 mm long, somewhat longer in fruit, broadening upwards. Flower 0.5-1.5 mm long, 4 parted to near the base, the lobes lanceolate, 0.5-1.0 mm long, pubescent; corolla 4-lobed, the lobes round, imbricate, exserted from the calyx; stamens 2, inserted at the top of the corolla tube, the filaments geniculate, curved, short, the thecae lenticular, separated by the somewhat enlarged and compressed connective; style short, included, apically compressed and curved, the stigma U-shaped; ovary subglobose, glabrous. Fruit a globose capsule ca. 1 mm across, chartaceous, septicidally dehiscent to the base, the placenta ovoid, pitted; seeds yellow, longitudinally reticulate, 0.3 mm long, oblong.
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Habit
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herbs
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Note
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Micranthemum pilosum occurs on forest floors and in wet shady places in lowland Panama. It differs from M. umbrosum of the southeastern United States and parts of South America in its smaller flowers and fruits, and in the pubescent calyx which is shorter than the corolla. Some plants from Texas and Louisiana now known as M. umbrosum also have these features and may be taxonomically distinct from plants of the eastern United States. The name M. pilosum is used with some hesitation as the photo- graph of the type does not reveal the floral details just noted. A study of Micranthemum material from the vicinity of Caracas is desirable.
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Distribution
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Panama
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Specimen
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CANAL ZONE: Old Las Cruces trail between Fort Clayton and Corozal, Standley 29121 (PH, US). Fort Sherman, Standley 30927 (PH). cocLE: Nata, McDaniel & Tyson 14741 (MO). HERRERA: Cienaga Juncalillo near Correa, McDaniel 8033 (MO). PANAMA: Rio Pacora E of Panama City on Panamerican Highway, Bartlett & Lasser 16961 (MO). Hills NE of Hacienda La Joya, Dodge et al. 16923 (MO). Majecito, camino del Campo el Ranchon, Rivera 3 (PMA). Big swamp E of Rio Tocumen, Standley 26683 (US). Between Matias Hernandez and Juan Diaz, Standley 31949 (PH, US).
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