Monographs Details: Mouriri regeliana Cogn.
Authority: Morley, Thomas. 1976. Melastomataceae tribe Memecyleae. Fl. Neotrop. Monogr. 15: 1-295. (Published by NYBG Press)
Family:Melastomataceae
Scientific Name:Mouriri regeliana Cogn.
Description:Description - Tree to 10 m high with a trunk to 15 cm thick, glabrous except for the inflorescence; young twigs terete or slightly compressed toward the apex. Petioles 2.5-5.0 mm long (5.0-8.0 mm including the attenuate wing of the blade); blades 6.1-14.0 cm long, 1.8-6.0 cm wide, ovate-elliptic or narrowly so to oblong-elliptic, acuminate to abruptly long-acuminate at the apex or rarely acute, rounded to acute at base, the included angle 70-150°, the blade abruptly acute or short-attenuate at the petiole; midrib grooved above, rounded below; lateral nerves barely visible or invisible above, barely visible below when dry, the upper and lower surfaces dull when dry, not shiny. Xylem of lateral veins open above, not tubular; stomatal crypts none; cells of upper epidermis 13-42 µ wide, polygonal, without rounded corners, not grouped in blocks; hypodermis present, one cell thick; mucilage walls none; free stone cells present only in base of petiole; terminal sclereids roundish to rectangular or stellate, the central bodies 1-4 times as long as wide, sometimes branched, often irregular in form, sometimes columnar, the arms short, typically narrow and rather blunt. Inflorescences single in the axils, each l-(-3)-flowered, 5.5-12.0 mm long to base of farthest pedicel when measured along the axes and with 2-4 internodes in that length, the upper internodes minutely puberulent, the lower glabrous or nearly so; bracts 0.6-2.5 mm long, triangular or ovate-triangular, acute at the apex, the lower and middle ones perfoliate at base, the uppermost 1.3-2.5 mm long and often separate; bracts present at anthesis. Flowers sessile, the true pedicel none; calyx green; calyx including inferior ovary 4.5-5.8 mm long, obconic to slightly campanulate, glabrous; free hypanthium 1.2-1.6 mm long; calyx lobes triangular and acute to rounded and abruptly acute, minutely puberulent within, 1.4-2.0 mm long, 1.6-2.0 mm wide, 1.5-2.2 mm long when measured from stamen attachment, the calyx splitting between lobes at anthesis for a distance of 0-0.1 mm. Petals yellow, 3.8-4.5 mm long, 2.0-2.7 mm wide, ovate to ovate-elliptic, acuminate at the apex, sessile, minutely puberulent above. Filaments 3.5-5.0 mm long, free from the petals; anthers 2.4-3.4 mm long; sporangia 1.7-2.3 mm long, dehiscing by widened apical clefts; gland 0.2-0.5 mm long, 1.7-2.4 mm from apex of anther when measured from center of gland; cauda 0.5-0.9 mm long, 0.7-1.0 mm long when measured from center of gland. Ovary 2-locular or with a half-partition; ovules axile, 6 or 7 in all, all at the same level on the placenta; style 7.5-12.0 mm long. Fruit and seed unknown.

Discussion:Owing to the scarcity of floral material in the type collection the few ovaries and the single anther available were left undissected and uncleared. Information on petals and ovary comes solely from the second collection. The two collections differ considerably in leaf size, especially in width, but otherwise are reasonably consistent with each other. The similarity of M. regeliana to M. bahiensis, and the differences between them, are noted under the latter species.