Monographs Details: Mouriri micradenia Ducke
Authority: Morley, Thomas. 1976. Melastomataceae tribe Memecyleae. Fl. Neotrop. Monogr. 15: 1-295. (Published by NYBG Press)
Scientific Name:Mouriri micradenia Ducke
Description:Description - Small tree, glabrous except for the inflorescence; young twigs 4-winged, becoming quadrangular, then terete. Petioles 1.5-3.0 mm long; blades 13.7-23.0 cm long, 3.9-6.5 cm wide, lanceolate-oblong to lance-elliptic-oblong, abruptly acuminate at the apex, acute at base with an included angle of 70-100°; margins slightly revolute; midrib low-rounded above, prominently rounded below; lateral nerves visible above and below when dry. Midrib xylem tubular; stomatal crypt extremes 23-38 µ in diam, 15-23 µ high, 60-80 per sq mm.; upper epidermis mostly one cell thick, occasionally two cells thick in the same leaf, mucilaginous walls common in the inner of the doubled cells, occasional in the single cells; hypodermis none; free stone cells present along the midrib in the first 2 cm; terminal sclereids appearing stellate from surface view but usually consisting of a columnar segment which produces few to several radiating arms above and below, the arms approaching the epidermises, the central bodies mostly 1-2 times as long as wide, usually consisting of the columnar segment, sometimes a more usual central body present. Inflorescences borne on the trunk, several together, each l-3(-5-) flowered, 2.4-7.6 mm long to base of farthest pedicel measured along the axes and with 1-3 internodes in that distance; bracts 0.5-2.0 mm long, ovate to triangular, acute to abruptly acuminate at the apex, the lower ones shorter, bracts mostly deciduous by anthesis; axes and pedicels more or less minutely puberulent. True pedicels green, 23-3.7 mm long; calyx outwardly blue, inwardly white; calyx including inferior ovary 9.0-10.5 mm long, obconic, constricted at the limb and sometimes at the base; free hypanthium 4.7-5.2 mm long; calyx lobes broadly ovate-triangular to broadly rounded, 1.9-25 mm long, 25-4.0 mm wide, ca 3.0-3.8 mm long when measured from stamen attachment, the calyx splitting between the lobes at anthesis a distance of 1.7-2.0 mm. Petals white, ca 8.5 mm long, 5.1 mm wide, elliptic, abruptly acute at apex, short-clawed at base, erose on the margins. Filaments white, 8.5-10.0 mm long; anthers pale orange, 5.0-6.3 mm long; sporangia 4.8-6.0 mm long, dehiscing by apical pores, a sclerified tissue like that of the sporangium wall extending down the gland side nearly to the gland; gland 0.3 mm long, ca 4.6-5.7 mm from apex of anther when measured from center of gland; cauda ca 0.8 mm long. Ovary 5-locular; ovules axile-basal, produced only outwardly from each placenta, 15 in all; style 18.0 mm long. Fruit said to be edible, its other characteristics and its seeds unreported.

Discussion:The distinctions between this plant and M. grandiflora are not great, and I suspect it will eventually prove to be only a form of the latter species. Dr. Ducke recognized the closeness of the two. Species status is granted for the moment, for the following reasons: (1) The leaves are all acute at base, some of them more acute than any leaves of M. grandiflora. (1) The anther gland is unusually small and is placed relatively low on the anther. (3) The sclerified area extending down the gland side of the anther is longer than in any collections of M. grandiflora. (4) Dr. Ducke, a very experienced and usually reliable field observer in Amazonia, said the plant was distinctly different from M. grandiflora as seen in the field. Two other differences cited by Ducke, the strictly cauliflorous habit and the habitat on high unflooded ground, are both known in some plants of M. grandiflora.
Distribution:Brazil South America| Amazonas Brazil South America|