Pleurothallis

R. Brown

in W. Aiton and W. T. Aiton, Hortus Kew. 5: 211. 1813.

Etymology: Greek pleuron, rib, and thallos, branch, referring to cespitose, slender, aerial shoots
Treatment appears in FNA Volume 26. Treatment on page 616. Mentioned on page 495, 617.

Herbs epiphytic. Roots fibrous. Stems erect, stout; sheaths tubular, variously enclosing stems. Leaves 1, erect, sessile or petiolate; blade leathery. Inflorescences terminal [axillary], 1–several lax or clustered racemes [solitary flower]. Flowers sometimes distichous, resupinate, opening simultaneously; sepals distinct [variously connate], subequal, membranous [thickly fleshy], pubescent [smooth or verrucose]; petals glabrous [verrucose, papillose, pubescent, ciliate, or fringed]; lip simple [2–5-lobed], membranous [thickly fleshy], callous, base loosely articulate to base of column or apex of column foot [sometimes inflexibly adnate]; column semiterete, stout [slender], winged [wingless], with or without column foot, apex with anther exposed or hooded; anther apical or adaxial; ovary articulate between ovary and minute curved pedicel; pollinia 2, pyriform with viscidium [spheric without viscidium] and caudicles [naked, with or without viscidium]; stigma adaxial [apical], 1–2-lobed; rostellum apical or adaxial. Fruits capsules, deciduous at pedicel (ca. 1 mm), ellipsoid, 3-valved.

Distribution

Tropics, s Fla., s Mexico, West Indies, Central America, South America.

Discussion

Species ca. 2500 (1 in the flora).

Pleurothallis is the largest genus in the subtribe Pleurothallidinae, and perhaps in the Orchidaceae.

Selected References

None.

... more about "Pleurothallis"
C. A. Luer +
R. Brown +
Tropics +, s Fla. +, s Mexico +, West Indies +, Central America +  and South America. +
Greek pleuron, rib, and thallos, branch, referring to cespitose, slender, aerial shoots +
in W. Aiton and W. T. Aiton, Hortus Kew. +
Pleurothallis +
Orchidaceae (tribe Epidendreae) subtribe Pleurothallidinae +