Fleischmannia dissolvens (Baker) R.M. King & H Rob., Phytologia 19: 203. 1970.

Robinson, Harold, 2015, The genus Fleischmannia in Argentina, Bolivia, Brazil and Paraguay (Eupatorieae, Asteraceae), PhytoKeys 57, pp. 61-92 : 63

Fleischmannia dissolvens (Baker) R.M. King & H Rob., Phytologia 19: 203. 1970.

Eupatorium dissolvens Baker, Fl. bras. 6(2): 308. 1876. Type: Argentina. Entre Rios, Parana, Christie 59 (holotype K).

Description.

Scrambling perennial herb ca. 1 m tall, with branches widely spreading at 45-90° angles; stems pale to dark brown, terete, striated, hispid to stiffly puberulous. Leaves opposite; petioles slender, 0.5-2.0 cm long; leaf blades triangular, membraneous, mostly 3.0-5.5 cm long, 2.0-3.5 cm wide, widest near basal 5th, base obtusely cuneate, margins with 5-10 sharp teeth, apex narrowly acute to slightly acuminate, surfaces puberulous on larger veins, sparsely pilosulous to subglabrous between veins, without glandular dots or hairs; triplinervate from petiole, with main veins brownish. Inflorescence a lax panicle with elongate branches, heads in cymiform clusters at tips of elongate branches; most nodes with foliiform bracts 1.5-2.0 cm long; branches and peduncles densely puberulous, peduncles 3-13 mm long. Heads ca. 7 mm high, 5 mm wide; involucral bracts ca. 30 in 3-4 series, basal involucral bracts narrowly ovate to lanceolate, 2-3 mm long, puberulous outside, inner bracts narrowly oblong, with short-acute tips. Florets ca. 17 in a head; corollas violet. ca. 2.5 mm long, basal tube ca. 0.5 mm long, throat ca. 2.2 mm long, lobes ca. 0.6 mm long, narrowly triangular, with numerous monoseriate hairs outside; anther thecae ca. 0.9 mm long, apical appendage ca. 0.2 mm long; style branches slender. Achenes 2.2-2.7 mm long, slightly and narrowly paler on ribs, ribs setuliferous; pappus whitish, of ca. 40 slender contiguous bristles ca. 3 mm long.

Specimens seen.

Paraguay: Guaira: Cordillera de Ybytyruzú, Cerro Acaté, secondary vegetation on base of mountain along southern side, 25°55'S, 56°15'W, 700 m, herb 1 m, flower pink, 17 Feb. 1989, E. Zardini & R. Velásquez 11100 (FCQ, MO, US); Guaira: Cordillera de Ybytyruzú, road to Polilla, Cerro Acatí, forest, 25°55'S, 56°10'W, 800 m, shrub 1 m, 23 July 1989, E. Zardini & R. Velásquez 13604 (FCQ, MO, US).

The species has previously been reported only from Entre Rios in Argentina. The Paraguay localities are farther up river.