The genus Fleischmannia in Argentina, Bolivia, Brazil and Paraguay (Eupatorieae, Asteraceae) Author Robinson, Harold Department of Botany, MRC 166, National Museum of Natural History, P. O. Box 37012, Smithsonian Institution, Washington, DC. 20013 - 7012 robinsoh@si.edu text PhytoKeys 2015 2015-12-02 57 61 92 http://dx.doi.org/10.3897/phytokeys.57.5784 journal article http://dx.doi.org/10.3897/phytokeys.57.5784 1314-2003-57-61 FF9B582DFFF62A1F312B6C79FFE0A369 576319 Fleischmannia microstemon (Cass.) R.M. King & H. Rob. var. microstemon, Phytologia 19: 204. 1970. Eupatorium microstemon Cass., Dict. Sci. Nat. 25: 432. 1822. Weed in Paris botanical Garden, Cassini s.n. (holotype P). Eupatorium guadaloupense Spreng., Syst. Veg. 3: 414. 1826. Guadeloupe, Bertero s.n. (P?, TO?) Eupatorium bimatrum Standl. & L.O. Williams, Ceiba 3: 64. 1952. Honduras, Morazan , El Zamorano, ca. 800 m, 18 Oct. 148, Standley 13132 (holotype F). Description. Erect annual herbs to 1 m tall, with slender, strongly ascending branches which often overtop the main axis; stems yellowish green to brown, puberulous. Leaves mostly opposite, alternate distally; petioles slender, usually 0.8-4.0 cm long; leaf blades membranaceous, broadly rhombic-ovate, mostly 2.0-3.7 cm long, 1.4-3.0 cm wide, base acuminate at petiole, margins crenate with 7-14 teeth on each side, apex usually short-acute, adaxially sparsely pilose, abaxially pilosulous on veins, with glandular dots; triplinervate from margins of basal acumination. Inflorescence lax cymose panicles with ascending branches, with many shorter lateral branches proximally; peduncles 2-7 mm long, slender typically puberulous. Heads ca. 4 mm high; involucral bracts 15-22 in 3-4 series, 1.5-3.8 mm long, outer narrowly acute, sparsely puberulous, inner bracts broad and mostly scarious at tip, apex apiculate. Florets 20-35 in a head; corollas lavender to white, 2.0-2.2 mm long, basal tube ca. 0.5 mm long, throat ca. 1.5 mm long, lobes ca. 0.2 mm long, without hairs outside; anther thecae ca. 0.7 mm long; style branches narrowly linear. Achenes 1.3-1.5 mm long, ribs persistently yellow, ribs and distal faces setuliferous; pappus white, of ca. 20 slender not or scarcely contiguous bristles ca. 2 mm long.