Monographs Details: Marlierea suborbicularis McVaugh
Authority: Maguire, Bassett & Wurdack, John J. 1958. The botany of the Guayana Highland--Part III. Mem. New York Bot. Gard. 10: 1-156.
Description:Latin Diagnosis - Frutex usque ad 2 m altus, subglaber, paniculis glabris; ramulis exalatis; foliis subscssilibus, 2 5 cm longis, orbiculatis vel late ovatis, basi late cordatis; paniculis circiter 50-floris, pedunculis 3-floris brevibus (plerumque 4-7 mm longis) et crassis (1-1.3 mm missis) ; alabastris 3-3.5 mm longis, obovoideorotundatis, clausis, calyptratis; hypanthio ut videtur carnoso, in sicco rugoso. coriaceo, ei margine (calyptra delapsa) inao(iualitcr 5-8-lobulato, nee tenui nee revoluto ; orbe staminali liirsutulo; slylo 4-5 mm longo.
Species Description - Shrub to 2 m tall, nearly glabrous, the youngest branchlets and leaves sparingly strigose with pale appressed hairs, the inflorescence glabrous; leaves rigidly coriaceous, subsessile, orbicular to broadly ovate, 2-4.5 cm wide., 2-5 em long, rounded or obtuse at the tip, shallowly cordate with broad rounded lobes at the base; petiole 1.5-2.5 mm thick, 2-3 mm long, much enlarged at the base; midvein flat or convex above, often channeled near the base, prominent beneath; lateral veins 10-15 pairs, somewhat elevated on both surfaces but conspicuous on neither; marginal vein about equaling the laterals and little arched between them, 1-1.5 mm from the margin; mature blades with 20-25 glandular dots per mm2, these visible as small black dots above, more conspicuous, paler, and convex beneath; inflorescence (at least in the specimens seen) terminal, the panicles 4-8 cm long, 3 times compound, about 50-flowered, each arising from the node above the last leafy node and subtended by an elliptic pale-strigose bract up to 2 mm wide, 4 mm long; other bracts, and bracteoles, deciduous before anthesis; buds 3-3.5 mm long, obovoid, rounded at the apex or obscurely apiculate; hypanthium at anthesis broadly campanulate, apparently coriaceous and wrinkling irregularly in drying, 3 mm long and the orifice about the same diameter, the margin becoming irregularly 5-8-lobulate, the whole prolonged about 2 mm beyond the summit of the ovary; calyptra deciduous soon after the flower opens; style 4—5 mm long; stamens about 100, 5 mm long, the anthers about 0.2 mm long, the staminal ring somewhat hairy; petals 3 or 4, clawed, the blade about 2 mm long and wide; ovary bilocular, the ovules 3-5 in each locule, ascending; fruit oblate, about 7 mm long, 10 mm in diameter; seeds 2, myrcioid, 7 mm long.
The assignment of this species to Marlicrea, instead of Calyptra nth en, is somewhat arbitrary. The calyptra breaks off irregularly, and the margin of the hypanthium later splits into several irregular lobes, as in Marlicrea. The calyptra, however, comprises the whole of the summit of the bud, including the unchanged apiculum; in Marlicrea the calyx ordinarily splits longitudinally so that parts of the fragmented apiculum remain attached to the individual lobes.
Perhaps the strongest argument for placing the species in Marlicrea may be found in its similarity to M. montana, from which it may be distinguished only by the characters noted in the key.