Description of Methysticodendron Amesianum- R. E. Schultes in Bot. Mus Leafl. Harvard Univ. 17 (1955) 2.
Tree up to 25 feet tall, with short, densely leafy branches. Leaves membranaceous, dark green, narrowly linear-ligulate, apically acuminate, basally gradually attenuate (very often without distinct petiole), marginally commonly subundulate or undulate, in adult state 20-26 cm long, 1.3-2.0 cm wide; central nerve strong, beneath strongly elevated, secondary nerves almost parallel, somewhat conspicuous, towards margin arcuateanastomosing; both surfaces minutely and irregularly (near veins denser) pilose.
Flowers up to 28 (mostly more or less 23) cm long apically 10-13 cm in diameter in bud, at dusk and night very strongly and sweetly fragant. Calyx spathaceous, green, papyraceous or membranaceous, 2- to 5-parted, with acute teeth, tubiform for half its length, 3/5 as long as corolla (up to 13 cm long), both surfaces very minutely and irregularly pilose. Corolla divided for 3/5-4/5 its length, with lobes usually 5 (but abnormally 4 or 6), membranaceous, white, spreading, spathulate or almost spathulately rhombiform, apically long acuminate, circinnate, entire, upper half strongly inflexed, 14-16 cm long, towards apex of tube usually 6mm. (but in widest part 2.5-3.3 cm) wide, near base very remotely and irregularly pilose within and without, with 3 conspicuous, strongly parallel veins; tube rather densely white-pilose within.
Stamens usually 5, shorter than corolla lobes; with terete filaments, more or less 5 cm long, 2 mm in diameter at base, apically strongly twisted and lightly bent, pilose except at apex; anthers yellow, 2.7-3 cm long, 3-4 mm in diameter. Ovary sub-cylindric, conspicuously 3-sulcate, glabrous, up to 1.5 cm long, 0.5 cm in diameter, gradually produced into styles. Styles glabrous, up to more or less 9 cm long, 2.5 mm in diameter, apically slightly clavellate and strongly flattened, with stigmatic tissue on very apex and along adges up to 1-1.5 cm in decurrent form, black (when dry) and papillose. Appendix (rudimentary style?) like styles arising from central part of ovary, up to 5.5 cm long, accompanied by 1 or 2 subclavellate, fleshy appendices 2-5 mm long. There are no herbarium collections of any species of this genus made from confirmed wild plants. No botanist specialising in this genus has ever reported seeing wild plants of any species. (Verbal) Reports by non-specialist botanists of the occurrence of ‘wild’ plants are either misidentifications (usually of Datura), or misinterpretation of remnants or localised escapes from cultivation, usually along creeks and occurring by vegetative propagation from stem fragments. In all such instances investigated in Ecuador and Colombia, the plants are of the anthropogenic hybrid Brugmansia x candida (Hay et al. 2012: 172-177). It is quite clear that such instances do not represent self-sustaining sexually reproducing populations.4
The complete lack of evidence of fruit dispersal or spontaneous seedlings, combined with the presence of large numbers of fruits containing viable seed, suggests their dispersers are extinct. Hence, all the species should best be regarded as extinct in the wild.4
data regenerated on Wed, 16 Jan 2019 13:46:05 -0500 [bcm v4.0]