Alfaroa manningii is an endemic Costa Rican tree species from the family of the walnut family ( Juglandaceae ). In the area of their occurrence, the species is a valued timber. The specific epithet honors the American botanist Wayne Eyer Manning ( 1899-2004 ).
Alfaroa manningii is up to 24 m tall tree, reaching breast height diameter of up to 90 cm. Buttress roots are small to medium in size. The bark is reddish-brown outside, pink on the inside and is very inside orange to yellow. The buds and branches are bare.
The leaves are arranged and are bald. The petioles are 5-9 cm long, the rachis with 90-230, rarely 50-290 cm long. The sheet consists of 8 to 12, rarely 6 to 18 leaflets that are opposite or nearly opposite, entire, and symmetrical. They are easily rolled back on the leaf margin, the sub-petiole is 2-5 mm long.
The female inflorescences are terminal at this year's shoots and are stiff and upright. Each ear of corn contains 40 to 50 flowers. The male catkins are available individually or up to six AC or against constantly and together form a zusammengezogeneRispe terminally at this year's shoots or they are formed from lateral buds on previous year's shoots. They grow to 18 cm long, are long and hanging flowering. Rarely, androgynous spikes occur, in which male catkins are below and above a female ear.
The male flowers exude a gardenia - like scent, they are not stalked. At the three-lobed bract are four flowers segments forming a hood and each of which includes three of the 12 stamens. The pollen is almost triangular in polar view, and has a diameter of 21.7 microns. The female flowers are stalked. The base of the flower is formed by the merger of a slightly three-lobed support sheet with a cover sheet edge. The four calyx lobes extend over the scar and make it to the heyday of a chamber. A stylus is missing. The stigma lobes are horseshoe shaped.
The fruit is broadly ovate, up to 3.5 cm in diameter and 3 cm long. The top is slightly concave. The calyx remains as 4 to 5 mm long beak receive. At the base sits up to 16 mm wide, resulting from supporting and cover sheet, rather circular lobes. The sheath is irregular, 1 to 7.5 mm thick, the surface deeply furrowed with 8 to 12 distinct longitudinal ribs from the top to the equator, which then disappear towards the base. The nutshell is 1 to 2 mm thick, already fresh hard.
The first two appearing in the open leaves of the seedling are simple, opposite or alternate, and entire. The next leaves are composed. The later leaves are then also against constantly and entire.
Dissemination and locations
Alfaroa manningii occurs only in a small area in Costa Rica to Platanillo in the northeast of the province of Cartago. The partly very large trees grow in the rain forest in 650-1200 m above sea level. Fruiting specimens are known only from the vicinity of Rio Platanillo. It often grows together with Oreomunnea pterocarpa.